how to reheat crab legs? Crab legs are a delicious and delicate seafood dish that can be reheated easily. To reheat crab legs, start by thawing them if they are frozen. Then, place the crab legs in a steamer basket and steam them for 5-7 minutes until they are heated through. Alternatively, you can wrap the crab legs in aluminum foil and bake them in the oven at 350°F for 10-12 minutes. Be careful not to overcook the crab legs, as they can become tough and lose their delicate flavor.