Car

Jackson Hole's main highway (U.S. 89/191) runs the length of the park, from Jackson to Yellowstone National Park's south entrance. This highway also joins with U.S. 26 south of Moran Junction and U.S. 287 north of Moran Junction. This road is open all year from Jackson to Moran Junction and north to Flagg Ranch, 2 miles south of Yellowstone. From Jackson, it's about 20 minutes to the park's southern (Moose) entrance. Coming from the north, it's about a 10-minute drive to the park's northern boundary.

Two scenic back-road entrances to Grand Teton are closed by snow from November through mid-May and can be heavily rutted through June. Moose-Wilson Road (Hwy. 390) starts at Highway 22 in Wilson and travels 7 miles north past Teton Village to the Granite Canyon entrance station. Of the 9 miles from here to Moose, 1½ are gravel and can be a little bumpy; high-clearance vehicles are best, but you can manage this route with a regular passenger car if you take it slow. This route is closed to large trucks, trailers, and RVs. Even rougher is 60-mile Grassy Lake Road, which heads east from Highway 32 in Ashton, Idaho, through Targhee National Forest. It connects with the John D. Rockefeller, Jr. Memorial Parkway span of U.S. 89/191/287, between Grand Teton and Yellowstone.