Custer Gallatin National Forest · Montana · Trail 905

Garnet Mtn (snowmo)

Garnet Mtn (snowmo) Trail is a 5 miles snow trail in Custer Gallatin National Forest, Montana. The Forest Service rates it trail class 4, highly developed. It is open to snowmobile, snowshoeing and cross-country skiing.

Trail conditions, closures and hazards are not tracked here. The Custer Gallatin National Forest official page carries current alerts and closure orders.

Map

One end Other endLine simplified to about 100 metres. Basemap from the USGS National Map.

One end45.4325, -111.1569 · Directions ↗
Other end45.4265, -111.2067 · Directions ↗

The ends are the two ends of the longest connected chain of segments. The record does not say which is the usual start. The trail is recorded as 2 segments.

The trail

Length5 miles
Trail class4, highly developed
Typesnow trail
Surfacenative material
Typical grade12-20 percent
Motor vehiclesOpen to at least one motorized use
AccessibilityNot evaluated
Trail numbers905
ForestCuster Gallatin National Forest (unit 0111)
StatesMontana
Detail publishedmanagement level, with uses

Values are the set across all segments. Class 1 is minimally developed and class 5 is fully developed. Grade and width are the forest's typical values, not measured extremes.

Allowed uses

SnowmobileAllowed year-round
SnowshoeingAllowed year-round
Cross-country skiingAllowed year-round

A use is listed when the Forest Service records it as managed, accepted or discouraged on any segment. Discouraged still means legal. Uses marked restricted are left out. Where the forest publishes a Motor Vehicle Use Map, that map governs motorized use.

Trailheads

The Forest Service recreation layer records no trailhead within a third of a mile of this trail's line. Many trails start from a road pullout or another trail with no trailhead record. The forest's recreation pages list the trailheads it does publish.

Distance is from the point to the nearest part of the trail line. Season text is what the forest wrote and is often a season name rather than a date. The recreation page link goes to the Forest Service site, which may redirect to the forest's recreation index.

Camping nearby

Campsite Atlas cards carry site counts and booking links from Recreation.gov. Forest Service cards come from the recreation layer and link the agency page.

Fire nearby

  • Prescribed
    Lonesome Wood Rx Unit 31B

    50 mi from the trail midpoint

Distance is to the reported incident point, not the fire edge. Closure orders are on the forest's official page.

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Reference

Questions people ask

How long is the Garnet Mtn (snowmo) Trail?

5 miles, the sum of the 2 segments the Forest Service records under this name in Custer Gallatin National Forest.

Source: Forest Service trail layer

What is allowed on the Garnet Mtn (snowmo) Trail?

snowmobile, snowshoeing and cross-country skiing. The trail is open to at least one motorized use.

Source: Forest Service trail layer

Where does the Garnet Mtn (snowmo) Trail start?

The line begins at 45.4325, -111.1569 and ends at 45.4265, -111.2067. No Forest Service trailhead is recorded within a third of a mile of it. The record does not say which end is the usual start.

Source: Forest Service trail layer

Is the Garnet Mtn (snowmo) Trail in a wilderness area?

No. The trail line does not cross any polygon in the National Wilderness Preservation System layer.

Source: Wilderness Connect

Where can I camp near the Garnet Mtn (snowmo) Trail?

Garnet Mountain Fire Lookout (0 mi), Spire Rock Campground (1 mi) and Spire Rock Campground (1.1 mi) are within five miles of the trail. Site counts and booking links are on Campsite Atlas.

Source: Campsite Atlas

How developed is the Garnet Mtn (snowmo) Trail?

Trail class 4, which the Forest Service describes as highly developed. Class 1 is a minimal, unimproved route and class 5 is fully developed, often paved.

Source: Forest Service trail layer

How steep and how wide is the Garnet Mtn (snowmo) Trail?

The typical grade is 12-20 percent.

Source: Forest Service trail layer

Who manages the Garnet Mtn (snowmo) Trail?

Custer Gallatin National Forest, Forest Service unit 0111. The trail is in Montana.

Source: Custer Gallatin National Forest official page

Is there a fire near the Garnet Mtn (snowmo) Trail?

1 active incident within 50 miles of the trail midpoint as of 2026-09-18, the nearest Lonesome Wood Rx Unit 31B at 50 miles. Check the forest's closure orders before you go.

Source: Fire nearby

Source

This page is built from 2 segments named GARNET MTN (SNOWMO) in the Forest Service TrailNFS_Publish layer, administrative unit 0111. Wilderness overlap is tested against the National Wilderness Preservation System layer from Wilderness Connect. Trailheads and Forest Service campgrounds come from the Forest Service Recreation Opportunities layer. Data refreshed September 17, 2026. The methodology page explains how segments become trails.