John, 87° is a touch warmer than we recommend, but you shouldn't need to start over. There are often places in a cooler house that are just a touch warmer, like on top of the refrigerator or in a dark-colored container on a sunny windowsill. Even storing your starter in the microwave (When it's not in use! Don't cook your starter!) can insulate it a little bit against the chill. Happy baking! Kat@KAF

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