The interior roads in Yellowstone National Park have closed to snowmobile and snowcoach travel for the season, but, beginning Saturday morning, bicyclists will be allowed to ride between West Yellowstone, Madison, Norris, and Mammoth Hot Springs.

During the time employees are clearing and preparing park roads for motorized, wheeled vehicles, adventurous bicyclists have an opportunity to experience the change from winter to spring firsthand without other visitor traffic.

Park officials say it will be a month or more before some of those roads are cleared and ready for cars, trailers, RVs and buses.

Snow removal efforts may also allow for brief bicycle-only access sometime in May from the South Entrance to West Thumb, and from the East Entrance toward Sylvan Pass. There is no seasonal bicycle-only access to Old Faithful or Canyon.

Cyclists are invited to call 307-344-2109 from 8 a.m. to 4:30 p.m. on weekdays for updated road access information, or 307-344-2113 for 24-hour weather information before traveling to the area.

The road from the North Entrance at Gardiner to Cooke City, Mont., at the park's Northeast Entrance, is open all year to cyclists and automobiles, weather permitting.

The only campground open this time of year is at Mammoth Hot Springs.

Weather permitting, park roads will begin opening to motorized vehicles on April 17. Some

interior park roads don't open to automobile travel until Memorial Day weekend.

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On the Net: www.nps.gov/yell/planyourvisit/springbike