No, crabs aren't in season. You can get them but they'll be even more ridiculously expensive than they are IN season. Bethesda isn't really the place to get crabs anyway - you want to travel to Anne Arundel or Baltimore counties - somewhere surrounding the Chesapeake.

For decent seafood, try Phillips or Legal Seafood. For great seafood, go to G&M in Glen Burnie/Arbutus.

Enjoy!