Here’s the secret that changes everything: most crab legs you buy, especially the big snow crab or king crab, are already cooked before they ever hit your pot. They were steamed or boiled on the boat and then frozen solid to lock in the flavor.
So, you are not “cooking” them to make them safe—you are reheating them. Think of it like warming up a leftover pizza slice. You just want it hot, not turned into a cracker.
The Sweet Spot: 3 to 5 Minutes
For a standard seafood boil, drop your frozen or thawed crab legs into the boiling pot of seasoned water. Set a timer for 3 to 5 minutes from the moment the water returns to a full boil. That’s it.
If you boil them for ten minutes, you’ll be cracking shells and finding meat that looks like it’s been on a treadmill for an hour. Nobody wants that. It’s the difference between a tender hug and a firm handshake from your grumpy uncle.
