This isn't a recipe that I particularly recommend freezing because the quality of the casserole wouldn't be the same once thawed.  The taste should be fine but the noodles may not fair well.  If you choose to freeze this tuna noodle casserole just make sure it's completely cool before spreading into a freezer safe dish and sealing well.  Thaw before reheating.  This should be good in the freezer for up to 3 months.