A tip for the camelbak in sub 30 temps, blow the hose out after you drink. As for trails I think most of the mountain trails keep better during the winter, all the little 10-20 mile loops tend to have alot of low areas that start having drainage issues and freeze-thaw problems. I have ridden into single digits and not had too many problems. The speed isn’t there, and i usually can’t feel my hands or feet, but it sure beats the indoor trainer. The biggest thing is to spend some money on some winter clothes, it makes all the difference.