When you pop that bottle into the fridge, you hit the pause button on fermentation. The cold slows down the yeast and bacteria, which are the tiny little workers that make kombucha so tangy. In this chilled state—between 32°F and 40°F—your booch can happily hang out for 1 to 3 months past its “best by” date, depending on the brand.
Think of your fridge as a cozy winter cabin for your kombucha. Everything slows down, but nothing stops completely. The flavor will evolve, getting a bit more sour and vinegary over time, but it’s still perfectly fine to drink.
A good rule of thumb? If it smells like a pleasant, sharp apple cider vinegar, you’re golden. If it smells like your gym socks after a hot yoga class, toss it.
