Moreover in order to further extend the shelf life you can vacuum seal them. Thaw the crab legs. How Long Is Cooked Crab Good For In The Refrigerator It is also helpful to place leftover seafood in airtight containers or wrapping to prevent additional exposure to air and moisture. . Beyond four days of refrigeration cooked. How long can crab legs stay in the fridge. Steps Fill large stockpot or Dutch oven half full with water. Storing Cooked Crab in the Refrigerator. Live crab is similar with a shelf life of 1 to 2 days in the fridge and 2 to 3 months. As cleaned and cooked crabs are good in the refrigerator for up to 2 days thats why if you are not going to consume them within two days then make sure you freeze them after cooling them down. Place the crab legs in the refrigerator the night before and let thaw slowly. When you buy cooked king crab legs from the store and place them in the fridge for future...