February riding
I have never rode Moab in the winter months, though I hear it is great.
We usually go to St. George every year in January or February, and the riding is great. The weather is usually about 10 degrees warmer in St. George than in Moab, (last year I was riding in shirt sleeves) that time of year. Just check the weather forecast and plan your trips accordingly. Definitely ride Gooseberry Mesa, about 45 min from town, plus there are many other great trails, Green valley, prospector trail, jem trail, virgin river trail, etc. just check in at Red Rock bicycles for a map of the local rides,
have fun