Guacamole is best eaten the same day it’s made, because avocados begin to brown soon after cutting. And while we’ve never found ourselves with leftover guacamole, we do like having the ability to make guacamole ahead when hosting a party or traveling to a potluck. It’s not a problem to make your guacamole a few hours ahead, if you store it properly.
To store guacamole, press plastic wrap directly onto the surface of the guacamole and refrigerate. Stir the guacamole before serving. If you love zesty lime flavor, a generous squeeze will also help keep your guacamole from turning brown. Another trick is to store guacamole with a layer of sour cream or salsa on top to keep air out.