Sourdough guide

Sourdough starter not rising after feeding? 7 fixes

If your sourdough starter will not rise, the root cause is usually temperature, feeding ratio, flour quality, or starter health. In most cases, you can recover it quickly with warm conditions and consistent feedings.

At warm room temperature (around 24C and above), King Arthur Baking notes a healthy starter often doubles within about 6 to 8 hours after feeding. In colder kitchens, it can slow down significantly.

2026-08-04

Quick answer (snippet-ready)

Target 24C to 27C for 2 to 3 days.
Use 1:2:2 as a starting point, then compare complete rise-and-fall cycles.
Use 10% to 20% whole grain flour (rye or whole wheat).
Track real rise in a straight-sided jar, not bubbles alone.

Starter rise rescue checklist

What changed recently?

Check each condition that applies. The score points to the most likely reason your starter is flat.

Quick diagnosis: what "not rising" actually means

A new starter under about 2 weeks can rise early, then go quiet for several days and still be normal.
A mature starter that suddenly stopped rising is usually too cold, underfed, or overly acidic from long gaps between feeds.

Match the symptom before changing the feed

What you see	What it can mean	Best next check
Day 2 or 3 surge, then little rise	A young culture can show an early bacterial bloom before its stable yeast population develops.	Keep the same simple routine; judge progress across days, not one feed.
Bubbles but no height gain	Fermentation is happening, but a thin mixture, weak structure, or a wide jar can hide the rise.	Weigh the feed, use a straight-sided jar, and mark the starting level.
Mature starter was active, then slowed	A colder room, changed flour, long feed interval, or small feed may have changed its cycle.	Restore the previous conditions and change one variable at a time.
Rises at 1:1:1 but not yet at 1:5:5	The larger feed has a lower proportion of ripe starter and normally takes longer to show a rise.	Wait for the full peak cycle at a stable temperature before increasing the ratio again.
Gray liquid or strong solvent aroma	The starter may have passed peak and exhausted much of its available food.	Check for contamination, then refresh and compare aroma and peak time over the next feeds.
No reliable rise by day 7 to 14	Young starters mature at different rates; age alone does not prove failure.	Check warmth, water, flour, and measurable rise before restarting.

Step 1: Check safety and health first

Discard and restart if you see pink or orange streaks, fuzzy mold, or a rotten smell.
Gray liquid (hooch) usually means hunger, not death. Feed it on schedule.

Step 2: Fix temperature first (most common culprit)

If your room is below about 20C, activity can look dead even when the culture is viable.

Use warmer water (about 27C to 32C) and a stable warm location. Measure the jar area with a thermometer; an oven light or other enclosed spot can become hotter than expected.

Step 3: Correct the feeding ratio

Ratios are by weight: starter : flour : water. 1:1:1 is equal weights.

A common failure pattern is too much old starter and too little new flour/water, creating an acidic and underfed culture.

A practical starting point is 1:2:2 (example: 20g starter + 40g water + 40g flour). Observe the full cycle instead of changing the ratio after one slow feed.

If needed, use 1:5:5 when you need a slower peak or your room is very warm, and allow it more time than 1:1:1.

Step 4: Add nutrients (flour choice matters)

If your feed is 100% white flour and the starter is sluggish, add 10% to 20% whole grain.

Rye is often a strong accelerator and helps weak starters rebuild activity.

Step 5: Track rise correctly

Stir down completely before feeding.
Move to a straight-sided jar.
Mark the level with tape or a rubber band.
Track rise + peak + fall timing for each cycle.

3-day rescue plan (practical protocol)

Day 1 to Day 3: keep starter at 24C to 27C.
Check every 12 hours and use 1:2:2 as a starting point; compare peak and fall before the next feed.
Use 10% to 20% rye or whole wheat in the flour portion.
Keep jar sides clean to reduce contamination risk.
Exit rescue mode when it doubles reliably in a predictable window for 2 to 3 days in a row.

When is it strong enough to bake?

It rises, peaks, and falls predictably.
It at least doubles at your normal ratio and room temperature.
It has a clean tangy/yeasty smell (not harsh solvent).

Use Sourdough Forge to stop guessing

Log feedings (ratio, flour type, hydration).
Track temperature and time-to-peak.
Add smell and rise observations in your journal.
Use reminders so rescue feedings happen on time.

FAQ

Why did my starter rise on day 2, then stop?+

Early activity can be normal in new starters. Keep temperature warm and feed consistently; many cultures stabilize after this phase.

My starter bubbles but does not rise. Why?+

Usually it is too cold, too acidic, or too thin. Warm it, feed a stronger ratio (for example 1:2:2), and track real volume rise in a straight jar.

Should I use warm water for feedings?+

Yes, especially in a cool kitchen. Water around 27C to 32C can help restore activity.

Do I need rye flour?+

Not mandatory, but adding 10% to 20% rye or whole grain often improves fermentation speed and reliability.

Sources

Sourdough Forge

Track your starter with Sourdough Forge on the App Store.

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