It Wasn't Warm Enough.

Bougainvilles in December    

Temperatures got below freezing for about a day and a half.

Bougainvilleas Got Damaged

It was just too much for this little greenhouse to handle.

Bougainvilleas Need a Warmer Greenhouse

Most of the Bougainvillea bracts were damaged, but there is some green left on 1 of them.

Bougainvilleas Have Hope

Perhaps the root systems are fine and only the bracts got damaged. I'll have to wait until Spring to find out if they will revive.