Why Isn't My Sourdough Starter Rising? 10 Causes and Fixes

Your sourdough starter isn't rising — and you're not sure why. Before you give up on it, know this: a starter that won't rise is almost never dead. In the vast majority of cases, one of ten fixable problems is holding it back. This guide works through every one of them in order of likelihood.

1. The Temperature Is Too Cold

This is the single most common cause. Wild yeast activity drops sharply below 20°C and becomes negligible below 15°C. If your kitchen is cool — common in Australian winters or in air-conditioned homes — your starter may be alive but simply too cold to show visible activity.

Fix: Move the starter somewhere warmer. Try the top of the fridge, inside the oven with just the light on (usually around 25°C), or near a warm appliance. A consistent 22–25°C is ideal. You should see improvement within 1–2 feeds once temperature is corrected.

2. You're Using the Wrong Flour

Plain flour, self-raising flour, and any flour with additives or bleaching agents can suppress microbial activity. Your starter needs unbleached flour with adequate protein and no additives.

Fix: Switch to unbleached baker's flour (at least 11% protein) for a wheat starter, or whole rye flour for a rye starter. See our Understanding Sourdough Flours guide for brand recommendations available in Australia.

3. The Water Contains Chlorine

Chlorine is added to tap water to kill microorganisms — which is exactly what your starter is. High chlorine levels can slow or suppress fermentation.

Fix: Use filtered water, or leave tap water in an open container on the bench for 30–60 minutes before using. Most chlorine dissipates in that time.

4. The Starter Is Too New

A freshly received or recently reactivated starter needs time to establish. The yeast population takes several feeds to rebuild to levels sufficient for visible rising — this is completely normal.

Fix: Feed daily for 5–7 days at 1:1:1 ratio at room temperature. By day 4–5 you should see bubbles and some rise. By day 7 it should be consistently active.

5. You're Not Giving It Enough Time

At 20°C a well-fed starter might take 8–12 hours to reach peak. Many people conclude it isn't rising when actually it rose and fell while they weren't watching.

Fix: Place a rubber band at the starting level after feeding. Check every 2 hours. If the rubber band is above where the starter currently sits, it rose and fell — that's a perfectly active starter. See our Step-by-Step Starter Feeding Guide for how to read the rise cycle.

6. The Hydration Is Off

A starter that's too stiff can restrict gas expansion and appear not to rise. For most wheat starters, a thick pancake-batter consistency is correct.

Fix: For a wheat starter, aim for a consistency where the mixture falls slowly off a spoon. For rye, it should be thicker — closer to peanut butter. Measure by weight for accuracy.

7. The Jar Is Too Wide

A small amount of starter in a wide jar may rise significantly but it won't be visible because the layer is thin. You need a narrow, tall jar to track the rise properly.

Fix: Use a narrow jar. Our 500ml starter jar is designed for this — the narrow profile makes the rise easy to track. Mark the starting level with a rubber band after each feed.

8. The Starter Is Over-Fermented

If fed infrequently at warm temperatures, the starter can peak and collapse before you check it. The giveaway is a strong acetone or alcohol smell, and a liquid layer (hooch) on top.

Fix: Discard most of it, feed at a higher ratio (1:2:2), and feed again sooner. Full recovery guidance in our Starter Maintenance guide.

9. The Container Has Soap Residue

Soap residue left in a jar after washing can kill the microbial culture. This is a surprisingly common cause of sudden inactivity in a previously healthy starter.

Fix: Rinse the jar thoroughly with hot water only — no soap — and dry it. Transfer the starter to the clean jar and resume normal feeding.

10. The Starter Simply Needs More Time

Dehydrated starters being reactivated can take 5–10 days to fully recover. The microbial population needs to rebuild from a small number of viable cells to a thriving colony. Keep going.

Fix: Feed daily, keep it warm, use good flour and filtered water. If after 10 days of consistent care there is absolutely no activity — no bubbles, no smell, no change — contact us. Our starters come with a free replacement guarantee.

Still Stuck?

Check our guide Is My Sourdough Starter Healthy? to distinguish between a struggling starter and one that's actually doing fine — or get in touch and we'll troubleshoot with you directly.

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