Why Is My Sourdough Not Rising? Start Your Diagnosis Here
By Maya Ellison · Updated August 18, 2026 · 3 min read
The short answer
This is the start-here page that answers why is my sourdough not rising in two questions. If your sourdough is not rising — starter flat, dough flat, or both — run the two-question diagnostic below before you change anything. It sorts your problem onto the right page in about two minutes, so you're fixing the actual cause instead of trying remedies in the dark.
The two-question decision tree
Ask both questions in order:
Question 1 — Is your starter doubling within 6–8 hours of a 1:1:1 feeding?
- No → the problem is upstream, in the starter. Take the starter branch below.
- Yes → the leaven is healthy. Move to Question 2.
Question 2 — Did the dough rise during bulk fermentation?
- No → the problem is bulk fermentation: temperature, time, or dough strength.
- Yes → the problem is later: shaping, proofing, or oven spring.
That's the whole tree. Now read the branch that matches your answer.
What "rising" actually means
One confusion causes half of all not-rising panic: expectations. A healthy starter at peak has doubled — measure it with a rubber band mark, not a guess. A healthy bulk fermentation has grown the dough 50–70% in 4–6 hours at 75°F (24°C) — it jiggles and shows bubbles under the surface. And a healthy bake gains its last rise in the first 15 minutes of oven spring. Anything short of those three targets is worth diagnosing; anything different-but-there is often fine.
The starter branch: why is my sourdough not rising at the source
If the starter isn't doubling, nothing downstream can rise — the dough is only as strong as its leaven. Start with the root-cause page, which explains the why: temperature, feeding ratio, chlorine, flour, and starter age. If your starter is bubbly but flat, the bubbles-without-volume page covers the too-watery problem, the thick paste test, and the jar-shape trap. If it was fine last week and flat this week, the fix page is the fastest way back, and the stage-by-stage guide walks through the day-by-day timeline of a new starter. Finish on the starter guide and rebuild a healthy feeding rhythm.
The dough branch: bulk fermentation, time, and strength
If the starter doubles but the dough doesn't, the environment is failing the dough. Three things control bulk fermentation:
| Factor | Problem range | Target |
|---|---|---|
| Dough temperature | Below 68°F (20°C) — fermentation crawls | 75–80°F (24–27°C) |
| Time | Cut short, or left too long | 4–6 hours, or until 50–70% bigger |
| Strength | No folds, slack dough | 3–4 coil folds, 30–45 min apart |
Cold dough is the usual culprit: at 68°F (20°C) bulk can stretch to 8–10 hours, and most bakers cut it short before the dough finishes. Give it warmth first, then time, then folds — in that order. A dough that rises in bulk but bakes flat belongs on the finished-loaf page, which covers shaping mistakes, dead oven spring, and the focaccia rescue.
Why is my sourdough bread not rising? The route map
| What you see | Start here |
|---|---|
| Starter has never doubled | The why page → the fix page |
| Starter bubbles but no volume | The bubbling page |
| Starter rose, dough didn't | The finished-loaf page |
| Rises everywhere except the oven | The stage-by-stage guide |
| Everything is flat at once | The full troubleshooting hub |
Bookmark this map — every baker has a flat week, and you'll want it again. The hub is the index for everything beyond starter and bread.
When to stop diagnosing
Diagnosis has a limit. If the starter passes the doubling test and the dough still won't rise at 75–80°F (24–27°C) with a 20% at-peak starter, check the flour: weak, bleached, or old flour undercuts every stage, and no technique compensates. After that, the beginner's guide is worth one clean re-read — most long slumps trace back to a habit that drifted a month ago.
Frequently asked questions
Where do I start when my sourdough is not rising?
With the starter test: feed 1:1:1 and see if it doubles in 4–6 hours. No — the problem is upstream, in the starter. Yes — move to the dough and check bulk fermentation temperature and time. This two-question tree is the fastest diagnosis in sourdough.
How do I know if the problem is my starter or my dough?
Run a 1:1:1 feeding in a marked jar in a warm spot. If it doubles within 6–8 hours, the starter is strong and the dough is the problem. If it doesn't, fix the starter before you bake — a weak starter undercuts every later stage.
Why is my sourdough bread not rising if everything looked fine?
Usually the final stage: shaping, proofing, or oven spring. Dough can rise beautifully in bulk and still bake flat if it's over-proofed in the banneton, degassed during shaping, or loaded into a cold oven. The finished-loaf page covers all three.
How long should I keep diagnosing before I change course?
Two bakes, maximum. If a strong starter, warm bulk fermentation, and proper shaping still produce a flat loaf, change the flour and start again — the recipe, not your technique, is usually the culprit.
What's the fastest fix for a sourdough that's not rising?
Warmth. Move the starter to 75–80°F (24–27°C), keep the dough at the same temperature during bulk, and preheat the dutch oven for a full hour. Temperature alone resolves most not-rising problems at every stage.