Sourdough Starter Recipe

Making your own sourdough starter is one of the most satisfying kitchen projects you'll ever do. In 5 to 7 days, with nothing but flour, water, and a little patience, you'll have an active starter that can rise a loaf of bread, turn into sourdough discard pancakes, sourdough discard donuts, sourdough discard blueberry muffins, sourdough discard crackers, pikelets, and a dozen other baked goods. This is the complete beginner's guide based on months of pandemic-era testing and years of teaching home bakers what actually works.

Jump to:

• Quick Glance at the Recipe: How To Make A Sourdough Starter
• What Makes This Sourdough Starter Guide Different
• What Is Sourdough Starter?
• How A Sourdough Starter Actually Works (The Microbiology)
• Sourdough Starter Ingredients
• Equipment You Actually Need (And What You Don't)
• How To Make Sourdough Starter Step-By-Step
• Want this whole timeline on paper?
• How To Tell When Your Starter Is Ready (The Peak Test)
• The peak test:
• How To Feed Your Sourdough Starter (Ongoing Maintenance)
• How To Store Your Sourdough Starter
• Common Sourdough Starter Problems To Avoid
• Make Your Sourdough Starter Routine Your Own
• Final Thoughts
• Two FREE Workbooks To Go With This Guide
• How To Use Your Sourdough Starter
• Sourdough Starter FAQs
• Leave Me A Review⭐️⭐️⭐️⭐️⭐️
• Recipe

Before you scroll, grab my FREE Sourdough Starter Workbook. It's a printable 7-day journal with each day on its own page, observation prompts so you know what to look for, feeding amounts, and two bonus recipes (sourdough pikelets to use your first discard, and a levain recipe for when you're ready to bake). No email required. It's the same workbook I used myself when I was learning, and it turns this post into a project you can actually do without scrolling back here every morning.

This guide is going to be simple. I'm not going to give you the history of sourdough or any extra information you don't need to get started. When I was learning, I was overwhelmed with information and felt like sourdough was going to be too complicated. It is not. It takes time and patience, but you've got this.

If you don't want to make your own starter, you can always ask for some from a friend who already bakes. Most sourdough starter "parents" are happy to share. But making your own teaches you a lot about what starter actually needs to thrive, and that knowledge pays off every time you bake.

Once your starter is doubling reliably in 4 to 6 hours, my soft sourdough sandwich bread or my sourdough english muffins are a fantastic next bake.

Check out my complete guide to sourdough discard recipes, which walks you through storage, freezing, the visual aging timeline, and a 5-day rotation calendar so you never throw a spoonful out.

What Makes This Sourdough Starter Guide Different

I spent months during the pandemic researching sourdough, testing methods, failing at bread, throwing out starters, and starting over. This guide is the distilled version of what actually works, with the marketing and over-engineering removed.

• A two-stage flour method, not just one flour. Most guides tell you to use one flour the whole time. I use whole wheat for Days 1 to 4 (more wild yeast on the bran for a jumpstart), then switch to unbleached AP or bread flour from Day 5 (slower for the yeast to process, so they don't get too hungry too fast as they grow stronger). The two-stage approach gives you a more reliable starter in less time.
• The peak-marking technique. A dry-erase marker on your jar tracks the rise so you can see exactly when your starter peaks. This single trick eliminates 90% of "is my starter ready" anxiety.
• A real day-by-day timeline. Not "1 to 2 weeks." Specific milestones for what Day 1 looks like vs Day 3 vs Day 5 vs Day 7, including what each day SHOULD smell like and what to do if it doesn't match.
• Real troubleshooting from real failures. That photo down below of my first sourdough loaf (the one that looks like a hockey puck) is real. I include the troubleshooting section that would have saved me weeks of wasted flour.
• A complete cluster of recipes for your discard. No more guilt about throwing flour in the trash. I link to every discard recipe on Sugar Geek Show, so you have something to do with the half you discard from Day 5 onward.
• My honest take on contrarian advice. When I think the internet is wrong (looking at you, "rye flour is better for starters"), I tested it myself and say so. You get my actual results, not regurgitated conventional wisdom.

What Is Sourdough Starter?

Sourdough starter is natural yeast (already living in your flour), combined with water and given time and warmth to multiply. The flour is the food. The water is the environment. The yeast is what does the rising.

Making a starter takes about 5 to 7 days because the wild yeast needs time to eat, multiply, and become strong enough to lift a loaf of bread.

To make the yeast stronger, we feed it. Yeast eats the starch in the flour and produces carbon dioxide gas. That gas gets trapped in the gluten of dough and is what makes bread rise.

If your yeast is weak, not enough gas is produced, and your bread will not rise. That's the whole game.

Feeding sourdough starter is the daily ritual of adding fresh flour and water. As the yeast eats, the starter bubbles and rises in the jar. At some point, it reaches its highest point ("the peak") and then begins to fall as the yeast runs out of food.

When your starter is at its peak, it's the most active and strongest it will ever be. That's when you use it for bread.

A lot of people try to rush this process. Try to understand that growing yeast takes time, just like growing a garden. If you plant a pumpkin seed and try to make pumpkin pie from a tiny sprout, it's not going to do much for you. Give the starter time.

Once your starter is established, you can keep it on the counter and feed daily if you bake a few times a week. If you bake less often, store it in the fridge and feed weekly. If kept properly, your sourdough starter will last you a lifetime.

For the full breakdown on ratios, schedules, and reading the peak, see my guide on how to feed a sourdough starter.

How A Sourdough Starter Actually Works (The Microbiology)

This is the part most starter guides skip, and it's the difference between blindly following steps and actually understanding why your starter does what it does.

What's actually in the jar. Sourdough starter is a colony of wild yeast (mostly Saccharomyces cerevisiae plus a few other strains like Kazachstania) AND lactobacillus bacteria. Both live naturally on flour. The yeast eats the starch and produces carbon dioxide gas (that's the rise) plus a little alcohol (that's the hooch, more on that later). The lactobacillus produces lactic acid and acetic acid (that's the tangy flavor).

Why temperature matters mathematically. Yeast metabolism roughly doubles for every 18º F you raise the temperature. Starter at 70º F moves at half the speed of starter at 88º F. That's why a "5 to 7 days" timeline is really "5 days at 85º F" or "10 days at 68º F."

Why hooch forms. Hooch is the grayish liquid you'll sometimes see on top of (or below) your starter. It's alcohol that the yeast produces as a byproduct of fermentation. Hooch isn't bad. It means your yeast has eaten all the available food and is hungry. Stir it back in or pour it off and feed.

Why the smell changes from "wet socks" to "fresh tangy bread." In the first 3 to 4 days, the jar has a mix of yeasts AND opportunistic bacteria, some of which produce sulfur compounds (the gross smell). As the lactobacillus dominates, the pH drops, sulfur producers die off, and what's left smells like clean fermented dough. The smell shift is your single best diagnostic that the right organisms have won.

Sourdough Starter Ingredients

You only need four things: flour, water, time, and warmth. The first two go in the jar. The other two are just the environment.

• Whole wheat flour (Day 1 to Day 4). Unbleached whole wheat. This is what kickstarts the wild yeast colony because the bran and germ carry more yeast and lactobacillus than any other flour. Buy a small bag, you only need it for the first 4 days.
• Unbleached bread flour or all-purpose flour (Day 5 onward). Switch from whole wheat once the starter is established. White flour gives the yeast more accessible starch and slows the metabolism slightly so the starter stays balanced between feedings.
• Filtered or bottled water. Tap water is fine for established starters, but for the first week you want water without chlorine. Chlorine kills the yeast you're trying to grow. Any standard water filter (Brita, refrigerator filter) removes enough. Warm the water to 90º F before adding it to your starter, this speeds the yeast metabolism right when you need the boost.
• Time. 5 to 7 days of daily feedings. Not really an "ingredient," but it's the thing most people underestimate.
• Warmth. 80º F to 90º F is the sweet spot. Below 70º F, your starter moves at a glacial pace. Above 95º F, the yeast starts to stress. A warm spot in your kitchen (top of the fridge, oven with the light on but oven OFF, near a heating vent) makes a huge difference.

Why The Two-Stage Flour Method Matters (The Science)

I get asked this a lot. Why bother switching flour mid-recipe?

Because the two flours do different jobs at different stages.

Whole wheat flour, used for the first 4 days, brings the wild yeast and lactobacillus colonies to your jar in higher concentrations than any other flour. The bran is full of them. Starting with whole wheat is the fastest path to an active starter.

Unbleached AP or bread flour, used from Day 5 onward, gives the now-established yeast colony a cleaner, more available carbohydrate source. The yeast eats starch more efficiently in white flour because there's less fiber competing for water. This translates to a more stable rise pattern, less aggressive boom-and-crash, and a starter that holds its peak longer.

If you only used one flour the whole time, you'd either get a slow start (with all-purpose) or an overly aggressive starter that goes sour fast (with whole wheat).

The combination is what makes the starter strong without making it frantic. This is one of the things I figured out the hard way after multiple failed attempts during the pandemic.

Equipment You Actually Need (And What You Don't)

You can make a sourdough starter with almost nothing. Here's the actual list, with the optional pro upgrades if you want them.

Required basics:

• A clean 4-cup container with straight sides. I use a 4-cup IKEA measuring cup, and it works perfectly. Straight sides let you see how much the starter rises, and the measurement lines are great visual cues. A large wide-mouth mason jar works too. Whatever you use, make sure it's clean and big enough that the starter won't overflow at its peak.
• A kitchen scale. Sourdough is a recipe where weight matters, especially in the early days when you're calibrating. Eyeballing doesn't work because flour packs differently by humidity.
• A dry erase marker. This is the underrated MVP. Mark the level of your starter right after you feed it. When you come back hours later, you'll see exactly where it peaked and where it fell. This single tool eliminates the "is my starter ready" guesswork.
• Plastic wrap or a clean kitchen towel. Loose cover, not sealed. The starter needs to breathe.
• A wooden spoon (for stirring after Day 1). Sourdough starter is acidic and can corrode metal over time, then leach into your starter. A wooden spoon, silicone spatula, or food-safe plastic spoon is the safe choice. (For Day 1 mixing, I use my clean hand. It's the best tool for making sure there are no flour lumps.)
• A thermometer. Thermoworks is the one I use and trust. Use it to check water temperature when you feed (you want 90º F) and to spot-check your starter's environment.

Don't use:

• Metal containers or metal spoons left in the starter. Sourdough starter is acidic, and prolonged contact with metal can corrode the metal AND leach into your starter. Glass, ceramic, or food-safe plastic containers only. Wooden or silicone utensils for stirring.

Optional pro upgrades:

• A sourdough home. This is a tabletop proofing container with insulated walls that holds your starter at a consistent warm temperature. If your house runs cool, this is the equipment upgrade that makes the biggest difference. I use this one.
• A folding proofer. Similar concept, larger capacity. Holds the starter AND any dough you're proofing at a precise temperature. Worth it if you bake bread frequently. Mine is here.

The pro equipment isn't required for a great starter. I made my first dozen starters without any of it. But once you start baking regularly, controlled temperature is the single best investment.

How To Make Sourdough Starter Step-By-Step

For exact measurements, see the recipe card below. This timeline assumes a room temperature of 80º F to 90º F. If your kitchen is cooler, expect each phase to take 1 to 2 days longer.

Want this whole timeline on paper?

If you'd rather print out a day-by-day journal so you can write notes each morning instead of scrolling back through this post, grab my FREE Sourdough Starter Workbook. Each day has its own page with the feeding amounts, observation prompts ("what does it smell like?", "how tall did it rise?"), and two bonus recipes (the pikelets recipe for your Day 5 discard and the levain recipe for the bread readiness test). No email gymnastics, just hit the link and download.

How To Tell When Your Starter Is Ready (The Peak Test)

You can't go by Day 7 alone. Some starters are ready on Day 5, some need Day 10. The test is the test, not the calendar.

The peak test:

1. After a feeding, mark the level of your starter on the jar with the dry erase marker.
2. Every hour, check the starter and mark the new level.
3. You're looking for the starter to double in size within 5 hours AND clearly fall back down within 12.
4. If it doubles in 5 hours, you have an active starter ready for bread.

The levain test (more precise):

A levain is a small mini-starter you make to test the strength of your main starter before committing it to a bread recipe.

• Combine 50g of unfed sourdough starter + 50g warm (90º F) filtered water + 50g whole wheat flour in a clean small jar.
• Mark the level.
• Watch over the next 5 hours.
• If the levain doubles within 5 hours, you have an active starter. Mine usually triples in 3 hours when it's at full strength.

If neither test doubles within 5 hours, continue the twice-daily feedings for a few more days. Some starters take a while.

PRO TIP: Track the time-to-peak after every feeding. Over a few weeks, you'll learn that YOUR starter doubles in (for example) 3.5 hours at your kitchen temp. That number lets you plan your bread baking precisely.

How To Feed Your Sourdough Starter (Ongoing Maintenance)

Once your starter is established, feeding is simple. The variables are how OFTEN and how MUCH.

The standard ratio: 1:1:1 by weight. 75g starter + 75g flour + 75g water. This is the all-purpose ratio. Use it unless you have a reason not to.

1:2:2 for slower fermentation. If you want a slower peak (or your kitchen is very warm), feed your starter twice as much flour and water as the starter weight. Example: 50g starter + 100g flour + 100g water. The extra food extends the time-to-peak.

1:5:5 for very slow fermentation. Useful for refrigerator storage or for someone who can only feed once every 3 to 4 days. 25g starter + 125g flour + 125g water.

Counter feeding (active baker, baking 2 to 3 times a week): Feed once per day at the same time each day. I feed mine around 9 AM because that fits my routine. Pick whatever time works for yours, just be consistent.

Fridge feeding (occasional baker, baking once a week or less): Feed once a week. Take the starter out, discard half, feed, let it sit on the counter for an hour or two until you see bubbles starting, then put it back in the fridge.

Mild vs sour flavor preference. Use your starter at its PEAK for a milder, sweeter flavor (good for sandwich bread, pancakes, dinner rolls). Use your starter AFTER it has peaked and started to fall for a more pronounced sour flavor (good for traditional sourdough loaves, rye breads). The longer you wait after peak, the more sour the starter gets.

For high-volume baking: Just scale the feeding up. If you need a larger starter for a big bread bake, feed it 200g flour + 200g water + 100g starter the day before you bake. By the time it peaks, you'll have ~500g of ready-to-use starter.

Once your starter is doubling in 4 to 6 hours, the easiest first bake is my sourdough focaccia, it forgives bad timing in a way that a traditional loaf just does not.

How To Store Your Sourdough Starter

Counter storage (active bakers)

If you're baking 2 to 3 times a week, keep your starter on the counter and feed once daily. The starter stays in peak shape for whenever you need it.

Refrigerator storage (occasional bakers)

If you're baking once a week or less, refrigerate your starter and feed once weekly. The cold slows the yeast metabolism dramatically. The starter goes dormant. It doesn't die, it just sleeps.

To use after fridge storage:

• Take the starter out 2 days before you plan to bake.
• Feed twice a day (morning and evening) for 2 days.
• By the third morning, it should be doubling within 5 hours of a feed. Now it's ready.

Vacation storage (1 to 3 weeks)

When I go on vacation, I just leave my starter in the fridge. The yeast goes into a dormant stage and eats at a much slower rate. You may see some gray liquid on the top (hooch, the alcohol byproduct of yeast eating). That's normal and doesn't mean anything is wrong.

When I get back, I just resume feeding as usual. It might take a few days of feedings to bounce back to doubling as fast as it used to, but the starter is alive and well.

No need to over-engineer the vacation protocol with elaborate feeding schedules or dehydration. Just put it in the fridge.

Long-term storage (months to indefinitely)

If you want to preserve a starter for months or longer (or send some to a friend), dehydrate it.

• Spread the starter thin on a piece of plastic wrap or parchment paper.
• Let it air-dry until completely crisp (24 to 48 hours depending on humidity).
• Crumble into flakes and store in a labeled zip-top bag in the freezer.
• To revive: rehydrate by adding equal weight of warm water to the dried flakes. Let sit 30 minutes. Then begin feeding flour + water in 12-hour intervals until the starter is bubbling and lively again (usually 3 to 5 days).

A dehydrated starter can sit in the freezer for years and come back.

Sourdough discard recipes are your best friend during the first week, when you're discarding flour every day. From Day 5 onward, save your discard in a separate container in the fridge and use it within a week. Discard gets more sour the longer it sits, so use it sooner for milder flavor.

Once your starter is active and doubling within 4 hours, it's ready for sweet bakes like my lemon blueberry sourdough focaccia with jammy blueberry filling and a buttery crumble top.

For weekend bakes when you want to use a serious amount of discard, my discard cinnamon rolls take a full cup at a time and use the heavy cream pour for that ooey gooey middle.

Common Sourdough Starter Problems To Avoid

Almost every "is my starter dead" question has a simple answer. Here are the most common issues I see, in the order they usually come up.

• The starter isn't rising after 7 days. Most common cause: temperature. Below 70º F, your starter moves at half speed. Move it to a warmer spot (top of the fridge, oven with the light on, near a heating vent) and give it another 3 to 5 days. Second cause: chlorinated tap water. Switch to filtered or bottled. Third cause: bleached flour. Bleach kills the yeast you're trying to grow. Use unbleached only.
• My starter doubled on Day 2 or 3, then went quiet. This is normal and expected. The Day 2-3 "false rise" is usually opportunistic bacteria producing gas, not real sourdough yeast. The activity dies off as the real yeast takes over. Keep feeding and it will come back stronger by Day 5 to 7.
• Starter smells like nail polish or paint thinner. Your starter is starving. The alcohol smell is concentrated hooch. Discard most of it, feed with extra flour (try a 1:2:2 ratio), and the smell should resolve in a feed or two.
• Starter smells like really sharp vinegar. Acetic acid is dominating, which happens when the starter goes too long between feedings. Feed more often (twice daily for a few days), and the lactic acid balance will return.
• My starter has a gray liquid on top (hooch). Totally normal. It's alcohol produced by the yeast. Stir it back in (mild flavor) or pour it off (slightly less sour flavor). Then feed as usual.
• Starter has pink, orange, or fuzzy patches. This is mold or contamination. Throw the starter out completely, wash the jar in hot soapy water (or run it through the dishwasher), and start over. This is the only situation where you actually need to start over.
• Kahm yeast vs mold. Kahm yeast is a thin, white-to-cream colored film on the surface of the starter. It's harmless but tastes off. Skim it off the top, give the starter a fresh feed, and it'll be fine. Mold is fuzzy, colored (green, pink, black, orange), and grows in patches. If it's fuzzy or colored, it's mold. Throw the starter out.
• The starter is overflowing the jar. Your starter is doing great, but your jar is too small. Move to a bigger container, or just feed less aggressively (try 1:2:2 instead of 1:1:1).
• The starter looks dead after weeks in the fridge. Probably isn't. Take it out, discard most of it, and start feeding twice daily. Most established starters bounce back within 3 to 5 days, even after a month of neglect.
• Bread isn't rising even though my starter is bubbly. Bubbles aren't the same as strength. Run the levain test (50g starter + 50g warm water + 50g whole wheat flour) and confirm it doubles within 5 hours. If not, your starter isn't strong enough yet. Keep feeding twice daily.
• My starter smells like cheese. A sharp, cheesy smell is a sign of strong lactobacillus activity. Some starters develop this naturally, and it's not a problem. Bread made from cheesy-smelling starter still tastes like normal sourdough.

If you're working through any of these problems, my dedicated sourdough starter not rising guide walks you through the 5 most common causes and exact fixes for each.

Make Your Sourdough Starter Routine Your Own

There's more than one way to do this. Here are the variations worth knowing.

• Rye starter (my honest take). A lot of people online claim rye flour makes a stronger, more active starter than whole wheat. I tested it. I did NOT notice a meaningful difference. Whole wheat works just as well for the home baker. If rye is what you have, use it. If you have a choice, whole wheat is just as good (and cheaper).
• All-purpose only starter. If you can't get whole wheat, you can start with all-purpose flour. It just takes 2 to 3 extra days because the yeast population on AP is lower. Add a Tablespoon of rye or whole wheat to your Day 1 feed if you have ANY of either lying around, even a little helps.
• Spelt or einkorn starter. Both work. Treat them like whole wheat for the first 4 days, then switch to unbleached AP from Day 5. The flavor will be slightly nuttier.
• Smaller maintenance starter. If counter space is tight, you can keep your starter as small as 30g. Feed 30g starter + 30g flour + 30g water. Plenty for most home baking.
• Larger maintenance starter. For high-volume bakers, scale up to 200g or 500g maintenance size. Same ratios.
• Buying a starter (the shortcut). You can buy an established starter online or get some from a friend. This saves you the 5 to 7 days of buildup. Both work. I still recommend making your own at least once because the process teaches you what an active starter looks, smells, and feels like, which makes troubleshooting any starter easier later.

Final Thoughts

A sourdough starter is the lowest-effort, highest-payoff thing you can have in your kitchen. Five minutes a day for one week, and you have access to a living ingredient that powers dozens of recipes for the rest of your life.

The hardest part is the patience. The second-hardest part is trusting that the starter knows what it's doing, even when nothing seems to be happening. By Day 4, you'll be convinced you killed it. By Day 7, you'll be marveling at how something that started as flour and water can lift bread.

Once your starter is going, the cluster opens up. Sourdough discard pancakes for the weekday breakfast. Donuts for the weekend. Blueberry muffins for breakfast meal prep. Crackers for snacking. Pikelets for a 5-minute small bite. And bread for everything in between. EASY!

Below is my own first sourdough loaf, lovingly photographed for posterity.

WHOMP WHOMP.

If your first loaf comes out like mine, please take a picture and send it to me. We all started there. Just keep feeding, wait until your levain doubles in 5 hours, and try again. Sourdough rewards patience.

Two FREE Workbooks To Go With This Guide

If you want printable companions to this post:

Sourdough Starter Workbook (FREE). A printable day-by-day journal with feeding amounts, observation prompts, the pikelets discard recipe for Day 5, and a levain recipe for testing bread readiness. Use it as your daily companion for the 7-day starter build.

Sourdough Bread Workbook (FREE). The natural next step once your starter is active. A complete same-day workflow from 10 AM levain through next-morning bake, with step-by-step timestamps (10 AM make levain, 10 AM autolyse, 2 PM make dough, three stretch-and-folds, bulk ferment, shape, overnight cold ferment, dutch oven bake at 500º F then 450º F). Includes a one-page cheat sheet you can print and tape to your fridge for bake days.

Both downloads are free, no email required. Bake with both side-by-side.

How To Use Your Sourdough Starter

Here's where the whole project pays off. Once your starter is active, you have access to a huge cluster of recipes.

Active starter recipes (use at peak, when fully doubled):

Sourdough discard recipes (use the half you'd otherwise throw away):

Sourdough Starter FAQs