Montana · Mountain biking · Near Emigrant

Fs 421

1.9 mi
round trip
1,367 ft
climb
Singletrack
surface
Out and back
route
Jul–Sep
best months

Is Fs 421 open right now?

Closure in the area

There's a closure order in Bozeman Ranger District. It doesn't name Fs 421, so check the source for the area it covers (16 listed).

As of · Source: USFS · Bozeman Ranger District. Agencies don't list every closure — check before you go.

Fs 421 is a mountain biking route in the Bozeman Ranger District of Custer Gallatin National Forest in Montana, managed by the Forest Service. It is a 3.7-mile out-and-back ride with a total elevation gain of 1,367 feet, and the climb is front-loaded, with the steepest stretch at about 0.5 miles in, where the grade reaches 19%. The route starts at roughly 6,567 feet and peaks at 7,507 feet. Summer is the most comfortable time to ride. Typical averages from a nearby weather station at Big Sky show July highs around 78°F with lows near 41°F, and the station sits about 900 feet lower than the route's high point, so temperatures on the summit run cooler. Telephone Ridge Road, a mountain biking route, lies about 0.4 miles away, and the Telephone Ridge hike is about 0.6 miles off. For an overnight stay, Spire Rock campground is about 3.8 miles away, and the Garnet Mountain Fire Lookout is about 3.9 miles away.

Around this trail

Add any of these when you start a trip
  • Sleep close

    Fr3125-02

    Campground

    Campground · 0.2 mi from the trail
  • Eat after

    Blacksmith Italian

    Restaurant

    Open after 6

Places © OpenStreetMap contributors

More in Emigrant
  • Best time to go · Jul–Sep

    Best time to visit Fs 421

    Best months: July–September. Best months have typical highs of 55–85 °F, lows of 30 °F or warmer (32 °F where the station doesn't record snow), at most one snowy day and no more than 12 wet days.

    1. Jan

      30° / 9°

      13 wet

    2. Feb

      34° / 9°

      11 wet

    3. Mar

      42° / 17°

      12 wet

    4. Apr

      48° / 23°

      11 wet

    5. May

      58° / 30°

      14 wet

    6. Jun

      67° / 36°

      14 wet

    7. Jul

      78° / 41°

      11 wet

    8. Aug

      77° / 39°

      11 wet

    9. Sep

      68° / 33°

      10 wet

    10. Oct

      53° / 25°

      10 wet

    11. Nov

      37° / 16°

      11 wet

    12. Dec

      27° / 9°

      14 wet

    Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Big Sky 2wnw, MT, 14.2 mi away at 6,590 ft. The station sits about 900 ft lower than this place, so expect it a little cooler here. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

Map and trail data © OpenStreetMap contributors