Yes, you can make rice krispies treats ahead of time, then store them in the freezer for up to 6 months. To freeze, line the rice krispie treats on a baking sheet and freeze on a baking sheet until hardened. Transfer to ziplock bags or a freezer-safe container and store. If you’re stacking the treats up, I recommend putting a piece of parchment paper between each layer to prevent sticking. When you’re ready to serve, let the treats thaw at room temp, then dig in!