Cyclists in Glacier must stay on roads or bike routes and are not permitted on hiking trails or in the backcountry. The one-lane, unpaved Inside North Fork Road from Apgar to Polebridge is well suited to mountain bikers. Two Medicine Road is an intermediate paved route, with a mild grade at the beginning, becoming steeper as you approach Two Medicine Campground. Much of the western half of Going-to-the-Sun Road is closed to bikes from 11 am to 4 pm. Other restrictions apply during peak traffic periods and road construction. Many cyclists enjoy the Going-to-the-Sun Road prior to its opening to vehicular traffic in mid-June. You cannot cycle all the way over the pass in early June, but you can cycle as far as the road is plowed and ride back down without encountering much traffic besides a few snowplows and construction vehicles. You can find thrilling off-road trails just outside the park in Whitefish, which is the closest place to rent bikes.
Glacier Cyclery. Daily and weekly bike rentals of touring, road, and mountain bikes for all ages and skill levels are available here. The shop also sells bikes, equipment, and attire, and does repairs. Information about local trails is available on its website and in the store. 326 2nd St. E , Whitefish, Montana, 59937. 406/862–6446; www.glaciercyclery.com. From $30.
Great Northern Cycle & Ski. You can rent road and mountain bikes from this outfitter, which also services and repairs bikes and sells cycling and skiing attire and gear. 328 Central Ave., Whitefish, Montana, 59937. 406/862–5321; www.gncycleski.com. From $75.