I have some live clams in the refrigerator that I would like to freeze because I will not be able to use them in time. My question is, how will I know which are good when I steam them later. Will they open up like live clams even if frozen and will the bad ones stay closed? Otherwise, how can I tell which are good when cooked? Thank you.
While About.com is not always the best, in this case their information passes the gut test. Frozen clams certainly would be killed, and so wouldn't open upon steaming.
The thing about never refreeze is almost certainly a palatability issue, not a safety issue, as long as they stay in the safe zone (under 40 degrees F) and are not unfrozen for very long--but clams are highly perishable. I would exercise considerable safety.
Sadly, I found conflicting information saying freezing them in the shell is okay--but they didn't offer any detail at all, so I its hard to give credence to:
despite their being a university sponsored site.
Being conservative, I would cook then freeze.