Every spring, bicycling, walking, jogging, roller blading, roller skiing, and similar means of non-motorized public travel may be permitted beginning sometime in late March or early April between the West Entrance and Mammoth Hot Springs prior to these roads opening to motorized public travel. Please note that roads will not be car-free: vehicles will be traveling on the roads as the park prepares for spring opening.
The first day of spring bicycling is never scheduled: it's dependent on conditions in the park and the pace of snow removal efforts. When conditions allow, there may be a brief period of bicycle access into the park from the East Entrance to the east end of Sylvan Pass (six miles from the entrance) and the South Entrance (to West Thumb) depending on road conditions for these early spring activities.
The road from the North Entrance (Gardiner, MT) to the Northeast Entrance (Cooke City, MT), is open all year to cyclists and automobiles.
- All cyclists must ride single file to the right.
- If riding before sunrise and after sunset, you must use a forward-facing white light and a rear-facing red light. Travel at night is not recommended.
- Stay 100 yards from bears & wolves and 25 yards from all other wildlife.
- During the spring bicycling period, public travel towards Old Faithful is prohibited south of the Madison Junction restroom and picnic area, and from Norris Junction to Canyon. Only authorized administrative travel may occur on these sections of road.
- Overnight camping is not permitted unless a backcountry use permit had been obtained for a designated backcountry campsite. The only campground open this time of year is at Mammoth Hot Springs.
- Wear a helmet and high visibility clothing: vehicles will be traveling on roadways.
- There are no services open in the interior of the park and riders should be prepared to take care of all their own needs. Bring food, water, extra clothing, and a bicycle repair kit. Heavy snow and/or rain occurs every April in Yellowstone.
- Water is available only at Madison picnic area and Mammoth.
- There is very limited cell phone coverage; pay phones are available at Madison, Norris, and Mammoth.
- Wild animals have the right-of-way and can be dangerous and unpredictable. Do not approach or feed wildlife.Turn around if bison are on the road. Do not cause them to run.
- Know how to travel safely in bear country.