I will start my rides when it is in the mid to low 30's as long as it's going to warm up at least to the low 40's. If it's going to stay in the 30's I'm usually on the trainer. I'm lucky cause I also ride motorcycles so some of my MC clothes and some of my ski clothes can used used for cold weather bike riding. Plus my wife is a seamstress/designer so if I cant buy it she can more then likely make it.