In November after most of the roads have closed to wheeled vehicles and while the roads are being prepared for winter use, a brief period of day-use bicycling, walking, jogging, roller blading, roller skiing, and similar means of non-motorized travel may be permitted on the following sections of the Grand Loop Road:
- Mammoth Hot Springs to West Yellowstone
- South Entrance to West Thumb
- East Entrance to the east end of Sylvan Pass (six mile corner)
- Tower Junction to the Chittenden Road
- Madison Junction to Old Faithful
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.
- Overnight camping is not permitted unless a backcountry use permit had been obtained for a designated backcountry campsite.
- 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 Canyon, Madison, Mammoth, Norris, and Old Faithful.
- The cleared section of the road may be narrow and covered with a layer of snow and ice, and pullouts may remain filled with snow.
- 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.