Yellowstone often tops the lists of every category when it comes to national parks. It is a captivating place year-round, but cyclist mostly go in the spring because they get exclusive access to portions of Yellowstone roads between mid-March and mid-April, according to National Geographic. Experience the iconic, wild, and magnificent Greater Yellowstone Ecosystem on your bike with Cycle Greater Yellowstone; go on an adventure tour with Backroads; or go on a wilderness experience with Escape Adventures.