Basic Park Information Weather and Seasons Yellowstone Weather by Season “YS-Spring-Bicycling-bison_FlickrNPSNealHerbert_680x392” "Spring bicycling from West Yellowstone in April, when the roads open to non-motorized traffic. Photo by NPS Neal Herbert | NPS Neal Herbert" Under construction Share this Facebook Icon Twitter Icon Email Icon Join Yellowstone National Park Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Join Yellowstone National Park Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Photo: NPS Neal Herbert