Even though you can technically freeze this dish, we do not recommend freezing as the texture will be mushy once thawed. That being said, if you would like to freeze the chestnut stuffing, do so by transferring it to a freezer-safe airtight container with room at the top for expansion. Freeze for up to 1 month. Thaw the frozen stuffing overnight in the fridge. Reheat in a 325-degree oven for 15-20 minutes, or until warmed through.