The Sourdough Starter Care Guide

Keep a starter you can read, trust, and bake with.

Learn the signals that matter, build a feeding rhythm that fits your life, and know exactly when your starter is ready. No folklore. No panic. Just better bread.

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I’m starting from scratch I already have a starter

Free guideBeginner friendlyBuilt for real schedules

1

Start With Warmth: The Goldilocks Zone

Warmth makes a starter faster and easier to schedule. 75–82°F (24–28°C) is a useful target for active feeding, but a healthy starter can also live at cooler room temperatures and will simply move more slowly.

Your starter's happy place. Aim for the gold.

Reading Goldie's Light

The Sourhouse Goldie gently warms your starter jar into the zone and tells you exactly where you stand at a glance:

BlueToo cold. Goldie is warming your jar up.
GoldJust right. Your starter is in the zone.
RedToo hot. Set the cooling puck on top of the jar.
Henry's Tip Keep the auto-warming on when you want your starter most active, like the night before a bake. Switch it off when you want relaxed, room-temperature behavior.
Go deeper: why temperature runs the show
Wild yeast and lactic acid bacteria both speed up as temperature climbs. In the Goldilocks Zone they work in balance, giving you steady rise and pleasant flavor. Colder favors slower, more acidic fermentation. Hotter stresses the yeast and can tip flavor harsh.
2

Build a Starter From Scratch

All you need is flour, water, a clear straight-sided jar, and a few minutes a day. Many starters become dependable in 10–14 days, but your starter's behavior matters more than the calendar.

Day 1: The Mix

Stir together 20g whole wheat or rye flour and 20g water in a clear, straight-sided jar. Cover loosely. Keep it warm. Stir again later in the day if you think of it.

Days 2–7+: Build the Culture

After the first 24 hours, keep 20g starter and feed it 20g water plus 20g flour every 24 hours. If it peaks and falls well before the next feed, switch to every 12 hours or use a larger feed such as 1:2:2.

A dramatic early bloom may be followed by several quiet days. That lull is normal. Keep the jar clean, stay consistent, and judge progress by the pattern after feeding.

Ready When...

Your starter doubles in roughly 4–8 hours after a 1:1:1 feed for at least three feedings in a row, smells clean and pleasantly fermented, and shows bubbles throughout.

Don't Get Fooled Big, dramatic bubbling in the first couple of days is not baking-ready activity. Early microbial succession can create a false start. Wait for the repeatable rise pattern above before you bake.
Go deeper: why whole wheat and rye first
Whole grain flours carry more wild yeast, bacteria, and minerals than white flour, so they kick-start colonization. Once your starter is established, you can transition to unbleached white flour for everyday feeding.
3

The Daily 1:1:1 Feed

One simple ratio, by weight. Discard down to a small amount of starter, then feed it equal parts flour and water.

The Rhythm

  • On the counter: feed at or shortly after peak. At 75–82°F, a 1:1:1 starter often needs feeding about every 12 hours. Use a larger ratio if you need a longer interval.
  • In the fridge: feed about once a week.
  • The ready signal: an established starter doubles in roughly 4–8 hours after a 1:1:1 feed at 75–82°F. Use its repeatable rise, aroma, and bubbles together as your green light.
Henry's Tip The mix should look like a thick paste, not a batter. It will rise and fall on a predictable clock, and that clock is what makes bake planning easy.
Go deeper: what discard actually does
Discarding is not waste for waste's sake. It resets the ratio of hungry microbes to fresh food so the culture stays vigorous instead of drowning in its own acids. Save your discard for pancakes, crackers, and quick breads.
4

Your Starter's Home: Jar Maintenance

Your starter is only as steady as the jar it lives in. Pick the right vessel and keep it clean, and half your "what's wrong with my starter" moments never happen.

Choose a Jar With No Shoulders

Straight-sided, not curved in at the top. A shouldered jar traps starter under the lip, hides the true rise, and makes stirring and scraping a chore. Clear glass lets you read the bubbles and the fall.

Give It Room to Climb

Fill no more than a third of the way after feeding. Your starter should double or triple without pushing the lid. A pint jar is plenty for a 20g routine.

Vent, Don't Seal

Use a clean solid lid set on top or screwed on loosely enough that gas can escape. A loose lid limits drying and helps keep dust and insects out better than cloth.

Keep It Clean

  • Move your starter to a fresh, clean jar every week or so. Dried crust on the walls is where mold gets a foothold.
  • Wipe the inside walls above the starter line after each feed. Stray smears up high dry out and can grow fuzz.
  • Wash with hot, soapy water, rinse well, and dry the jar before use.
  • Food-safe stainless steel, wood, silicone, and plastic utensils are all suitable. Avoid prolonged contact with reactive copper or aluminum.
  • Mark the fill line with a rubber band so the rise is impossible to misread.
Henry's Tip Two jars beat one. Feed into a clean jar each time and wash the old one while the fresh feed gets to work. Your starter never sits in yesterday's residue, and you always have a spare ready. Sourhouse straight-sided jars are built for exactly this.
Go deeper: why the jar shape matters
Straight walls make rise and fall easier to measure and are simpler to scrape clean. Curved shoulders can distort the visual read and leave dried residue in harder-to-reach areas.
5

Bake-Day Prep, On Your Schedule

Three steps stand between your jar and your recipe.

Step 1: Check the Recipe

Find how much starter your bake calls for.

Step 2: Scale Your Pre-Bake Feed

Do one bigger feed before your bake. Increase the starter, flour, and water so you end up with enough for the recipe plus about 20g leftover to keep your culture going.

Step 3: Time It, Then Bake

Give that same feed several hours before you plan to mix. Once it has at least doubled, it is ready to go into your dough. One feed does both jobs: enough starter, and peak timing.

Henry's Tip Keep the jar in Goldie for pre-bake feeds and note your time-to-double. Once you know that number, you can plan your mix and your DoughBed proofing window like clockwork, even in a cold December kitchen.
Go deeper: time-to-double as your personal clock
Time-to-double changes with temperature. Track it once at your usual warmth and you have a reliable scheduling tool: if your starter doubles in 5 hours, feed it 5 to 6 hours before you want to mix dough.
6

Safe Starter, Safe Kitchen

Most "is my starter dead?" moments are nothing. Here is how to tell the harmless from the toss-it.

✅ Hooch: Totally Fine

A layer of clear or grayish liquid on top just means your starter is hungry. Stir it back in for tang or pour it off, then feed as usual.

🛑 Pink or Fuzzy: Toss It

Pink or orange coloration, or fuzzy mold of any color, means contamination. Throw the starter out, wash the jar thoroughly, and restore from your dried backup.

The Rule When in doubt about pink or fuzz, do not taste-test your way to an answer. Toss, clean, restore. Your backup makes this painless.
7

Back Up Your Starter

Ten minutes of drying protects years of culture. Every serious starter deserves an insurance policy.

The Dried "Cracker" Method

  • Spread a thin layer of active starter on parchment paper.
  • Let it air-dry completely, then snap it into cracker pieces.
  • Store completely dry flakes in an airtight, labeled container in a cool, dark place. Freezing can extend storage, but no backup is guaranteed indefinitely.

To Revive

  • Soak a few grams of dried starter overnight in filtered water.
  • Begin daily equal-parts flour and water feeds.
  • Within days it is bubbling and ready for the 1:1:1 routine again.
Henry's Tip Wait until your starter is well established and reliably doubling before you dry a backup. A mature culture bounces back fast; a young one might not. Once it is strong, dry a batch, label it with the date, and tuck a piece in the freezer. Future you will be grateful.
8

Flavor Begins in the Starter

Here is the truth most recipes skip: your starter controls the flavor of your bread. Mild and creamy or bold and tangy, the choice is made in the jar before you ever mix dough.

Video: You Don't Hate Sourdough, You Hate Over-Fermented Sourdough▶
Start Here

You Don't Hate Sourdough. You Hate Over-Fermented Sourdough.

Watch on YouTube →
Video: How to Control Flavor in Your Sourdough Starter▶
The Science

How to Control Flavor in Your Starter: Mild vs. Tangy

Watch on YouTube →
Video: Flavor From Fermentation▶
The Philosophy

Flavor From Fermentation: Why Time and Patience Beat Any Ingredient

Watch on YouTube →
Henry's Tip If your family says your sourdough is "too sour," do not give up on sourdough. Feed your starter more often, use it closer to peak, and keep it in the Goldilocks Zone. Sourness is a dial, not a destiny.
Go deeper: the mild vs. tangy dial
Yeast produces lift; bacteria produce acids. A frequently fed, warm starter used at peak favors yeast and mild flavor. A starter that sits long past peak accumulates acetic and lactic acid, and that is where harsh sourness comes from. Control the schedule and you control the flavor.
9

Know Your Starters

The 100% hydration starter in this guide is the workhorse, but it has cousins. Each one is the same wild culture kept at a different consistency, and each shines at different bakes.

Classic Liquid Starter 100% hydration

Equal parts flour and water. The everyday starter this guide teaches: easy to read, easy to feed, perfect for lean doughs and daily baking.

Best for: everyday sourdough, batards, boules.

Read the Starter Guide →

Stiff Starter ~50% hydration

Half the water, twice the patience. A firm, doughy culture that ferments slower and favors milder, yeastier flavor with serious lifting power.

Best for: enriched doughs, milk breads, sweet rolls.

Explore in the Bread Authority →

Pasta Madre Italian stiff starter

The lievito madre of Italian tradition: a tight, low-hydration mother dough with a gentle, sweet profile. The gateway to panettone and pandoro.

Best for: panettone, brioche, festive breads.

Unlock the Secrets of Pasta Madre →

Yeast Water No flour culture

Natural leavening fermented from fruit, no starter jar required. A whole different road to wild yeast, and the subject of Henry's Yeast Water Handbook.

Best for: experimenting, mild sweet doughs.

How to Keep Yeast Water Alive →
Go deeper: why hydration changes flavor
Hydration changes fermentation speed, microbial balance, and how acids are produced, but it does not create a simple “stiff equals mild, liquid equals sour” rule. Flour, temperature, feeding ratio, maturity at use, and dough fermentation all shape the final flavor.
10

Preferments: The Bigger Family

Your sourdough starter is one member of an old family. Bakers have always fermented a little flour ahead of time to build flavor. Meet the relatives.

Video: Pre-Ferments, The Architecture of Flavor course introduction▶
Course Introduction

Pre-Ferments: The Architecture of Flavor

Watch on YouTube →

The Five You Should Know

  • Pâte Fermentée: yesterday's dough, saved for today's flavor. Module 1 →
  • Poolish: loose, wet, and elegant. Controlled fermentation, French style. Module 2 →
  • Biga: stiff Italian preferment built for strength and structure. Module 3 →
  • Levain: a sourdough offshoot built fresh from your starter for a single bake.
  • Sponge: a loose, yeasted preferment of flour, water, and a little yeast, left to bubble before mixing. The classic sponge-and-dough method behind many sandwich and enriched loaves.

Read: What Are Pre-Ferments? The 5 Methods Every Baker Should Know →

Academy Members The full Pre-Ferments course lives in your classroom: introduction, Pâte Fermentée, Poolish, and Biga modules with recipes and worksheets. Open the course →
11

The Starter Library

Everything else we have on starters, gathered in one place. All of it free, all of it road-tested by the Baking Great Bread at Home community.

🎥 Watch

📖 Read

🎓 Learn

Want the Whole Encyclopedia? This library is a sampler. The Bread Authority holds 180+ starter resources, organized by problem and skill level: Sourdough Starter · Starter Maintenance · Pre-Ferments · Yeast Water
12

Your Starter Toolkit

This guide is the map. These are the tools that walk it with you, all from the Crust & Crumb world.

🧙 The Companion App

🧭 Go Further

🏡 The Communities