With Colorado ski areas shifting into summer operations, resorts are opening trails to mountain biking or will do so any day. Many utilize their chairlifts for "bike hauls," requiring the purchase of trail passes for access. Copper Mountain allows free mountain biking but charges for bike hauls. Trail access is free at Arapahoe Basin, where there is no lift-assisted biking. Most of the resorts with mountain biking operations also offer rentals, lessons and clinics.