Our turnips (mixed with radishes, sugar beets, and some other brassicas) are growing fast and big and the deer have been hammering them since they first started to grow, even before any frost. I watched a small buck feed for 45 minutes in one field, switching back and forth from wheat/oats to the broadleaf plants. I watched a doe in another field with scattered brassicas go from plant to plant and smell them to decide if she wanted to eat them or not.

Ours really grew fast. I guess it wouldn't hurt to try and plant some late.