Pizza dough rises on a clock that temperature sets. The same dough that is ready in about 6 hours in a warm kitchen can take twice as long in a cool one, and in the fridge it slows to a crawl. If you know roughly how fast yeast works at your temperatures, you can choose the yeast amount and the plan that put the dough at its best when you want to eat, instead of hoping.
This guide explains how temperature changes rise time for yeasted pizza dough, with numbers from the fermentation model behind our pizza dough calculator. They are predictions from a model fitted to the yeast tables pizza makers use, not measurements of your dough, so each comes with a range.
How fast yeast works at different temperatures
Baker's yeast speeds up as dough warms through the kitchen range (the model stops at 32 °C) and slows steadily as it gets colder. Relative to a kitchen at 24 °C, the model puts the rate at:
| Dough temperature | Rate compared with 24 °C |
|---|---|
| 28 °C | about 1.4× faster |
| 26 °C | about 1.2× faster |
| 22 °C | about 0.8× |
| 20 °C | about 0.64× |
| 18 °C | about 0.5× |
| 10 °C | about 0.16× |
| 4 °C (a typical fridge) | about 0.06× |
Two things stand out. Around room temperature, every 2 °C changes the time by about 20–30%. And in the fridge, yeast slows far more than the room-temperature rule of thumb in our sourdough calculator (about 2.2× slower for every 8 °C colder) would suggest: at 4 °C it works at roughly one sixteenth of its pace at 24 °C. That is why cold-fermented pizza dough needs so little yeast, and why a few degrees difference between fridges matters.
That rule is a room-temperature rule for sourdough bulk and was never meant for the fridge. For baker's yeast, laboratory growth data show the rate dropping much faster than that below about 15 °C; applied to yeast at 4 °C, the rule would overstate the rate more than twofold. So the pizza calculator uses its own curve for yeast. Sourdough organisms react to the cold in their own way (see sourdough vs yeast pizza dough), and there is no fridge model for them in either calculator.
Same-day dough: rise time by kitchen temperature
With a fixed amount of yeast, the time until the balls are ready to bake (roughly doubled, airy, springing back slowly when pressed) moves with the kitchen temperature. For a dough with 0.1% instant yeast (1 g per kilogram of flour), the model predicts:
| Kitchen | Hours until ready | Model range |
|---|---|---|
| 18 °C | about 12½ h | 10–16 h |
| 20 °C | about 10 h | 7½–13 h |
| 22 °C | about 7¾ h | 6–10 h |
| 24 °C | about 6¼ h | 5–8 h |
| 26 °C | about 5¼ h | 4–7 h |
Doubling the yeast to 0.2% does not halve the time. The model puts it at about 4.9 hours at 22 °C instead of 7.7, because time falls more slowly than the yeast amount rises (about 1.6× the time for half the yeast). That is the slope the model takes from the practice tables it was fitted to: more yeast speeds things up, but with diminishing returns.
The fridge: why cold dough needs so little yeast
In the fridge, the yeast is not dormant, just slow. Most cold-ferment plans have three parts: an hour or so at room temperature after mixing, a long rest as balls in the fridge, and about two hours at room temperature before baking so the dough warms and relaxes. All three count toward the rise, and in a 72-hour plan the fridge part does most of the work.
With a 22 °C kitchen and a fridge at 4 °C, the model predicts about 0.20% instant yeast for 24 hours in the fridge, 0.13% for 48 hours and 0.09% for 72 hours. Fridge temperature shifts these noticeably: at 6 °C the amounts drop to about 0.17%, 0.09% and 0.06%, and at 3 °C they rise to about 0.22%, 0.14% and 0.10%. If you do not know your fridge temperature, a fridge thermometer helps as much as precise weighing: 2 °C either way moves the yeast amount by about a quarter.
The ranges are widest here. We know of no source that measures when pizza dough becomes ready at 2–8 °C over several days, so the cold part of the model rests on practice tables and laboratory data on yeast activity in the cold. The calculator shows the range for that reason, and the dough itself has the last word.
Dough temperature, not just room temperature
The model uses the temperature of the dough. In a kitchen that stays steady, a dough left for hours settles close to room temperature, so the calculator asks for the room. Two things can push the dough away from it:
- Water temperature. Mixing with warm water starts the dough warmer and speeds up the first hours. The same three-factor water formula that sourdough bakers use works for pizza: see the DDT formula and water temperature.
- Large batches. A big tub of dough holds heat and warms itself as it ferments, while single balls cool and warm quickly. The model assumes home-sized batches.
Reading the dough
Whatever the clock says, check the dough before you bake. Ready balls have roughly doubled, look smooth and slightly domed, and a gentle fingertip press fills back in slowly. Balls that spring back at once need more time; balls that are slack, flat and covered in large bubbles have gone too far and will bake flatter. Cold balls straight from the fridge are hard to stretch, which is why every cold plan ends with about two hours at room temperature.
Plan it for your kitchen
Put your room and fridge temperatures, the number of pizzas and the time you want to eat into the pizza dough calculator. It works out the grams, the yeast with its range and a schedule back from dinner. For how long to keep dough in the fridge, see cold ferment pizza dough: 24, 48 or 72 hours, and for a natural starter instead of yeast, sourdough vs yeast pizza dough.