Hi there, Bree! Sourdough starter doesn't stay ripe for long, it is a small window of time that you're looking to capitalize on for a nicely leavened loaf. Once the starter starts to deflate, it can still be used in a recipe but won't be quite as strong or quick to leaven your dough as it will be when it's at peak ripeness. Once the starter goes into the fridge it will become dormant because of the cooler temperature, so even if the starter is just in the fridge for a day it still needs to be fed as it will have deflated and become hungry again. We hope this helps and happy baking! Morgan@KAF

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