Yes, they started blooming on the north side of Dallas during the last week of January... earliest I can remember. Ours appear to have pulled through the short freeze to the mid-20s this morning; but we still had a lot of heat in the ground from being above 80° F just four days ago. Hope yours did okay, too.

Not sure how cold the flowers can go, but a cover would probably protect them enough in most cases. It's the pounding from the thunder and ice storms that usually do the most damage to ours by pancaking them into the mulch and mud. So, I'll cut them to enjoy inside if there's a bad storm warning.... otherwise they're left to chance. Other than drowning in a poor draining spot, the leaves and bulbs seem tough enough to handle anything else north Texas can throw at them.