You can make guacamole ahead, though we prefer to serve it immediately after making. If you're making it ahead, here are two methods for storing it: Transfer guacamole it to a glass container and pack it down to release any air bubbles. Slowly pour cold water over top of guacamole to cover, then secure lid and refrigerate. When ready to eat, pour water out of container, stir guacamole and serve. Alternatively, instead of covering with water, you can press a piece of plastic wrap over surface of guacamole before securing lid. This isn't as foolproof as the water method, but still works well! If neither of those options sound good to you, try this guacamole saver!