How Temperature Affects Kombucha

Temperature plays an important role in brewing kombucha. Here’s what you need to know in order to ensure your homemade kombucha is brewing at its peak temperature!

If you read our guide to homemade kombucha, or if you’ve tried brewing before, you probably know that temperature plays a role in the fermentation of kombucha.

But what exactly is the ideal temperature for brewing kombucha? And how can you keep the temperature stable (even in those colder winter months)?

How temperature affects kombucha

Kombucha is fermented thanks to the microscopic power of bacteria and yeast! The yeast eat sugars in your sweet teas, transforming them into carbon dioxide (carbonation) and ethanol. The bacteria feed on this ethanol, turning it into acidity and giving kombucha its distinctively sour taste.

But in addition to needing enough “food” to feed on, these bacteria and yeast also have a temperature they like to live at.

When the temperature is too low, they tend to slow down, performing the fermentation at a slower rate (while also increasing the likelihood of mold). Kombucha brewed at cooler temperatures will be weaker and more sweet.

When the temperature is too high, these microorganisms begin to die or become weaker. Kombucha brewed at warmer temperatures will have a very strong vinegar and yeast flavor.

The ideal temperature for brewing kombucha

Kombucha can be brewed in a temperature range between 60-85°F (16-29°C), though for the most delicious kombucha, aim for a temperature range between 75-80°F (24-26°C).

How to maintain an ideal temperature

When preparing your kombucha for fermentation, it’s important to consider where it will be hanging out as it undergoes it’s magically delicious transformation.

If your house is warm (such as in the summer), place the kombucha somewhere cool, like a dark cupboard or the basement. You should also taste your kombucha more regularly in warmer climates, as it will ferment much more quickly.

If your house is cool (such as in the winter), find a warm spot in your house, like the laundry room, above a fridge, or near a radiator/heater. If you have a difficult time keeping your kombucha in a safe temperature zone, consider purchasing an affordable heat mat, an energy-efficient wrap that goes around your jar to keep your kombucha at a stable temperature.

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