It happens every year. What we hoped would be an endless season of riding suddenly turns into fall. We keep riding, trying to ignore what is inevitably on the horizon—winter. But those cold dark days loom large and for many of us in the northern hemisphere, our thoughts turn to escape. Even before the snow starts to fly and we hang up our mountain bikes for the season, we begin planning our liberation from our icy prison. Luckily there are a number of winter mountain bike destinations in the USA that can provide relief from winter’s frosty embrace. But when is the best time to ride? Many of these destinations…