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Fossil Ridge Trail

Gunnison National Forest, Colorado · 3 min read

Distance
12 mi
Elevation Gain
2,600 ft
Difficulty
strenuous
Route Type
Out-And-Back
Best Season
July through September
Est. Time
5-7 hours
Dog Friendly
Yes
Kid Friendly
No
Difficulty Score
10 / 10

Trailhead Amenities

Restroom
Vault Toilet
Parking
Free
Cell Service
No Signal
Water
None
Camping
Dispersed
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Conditions, regulations, and fees change frequently. Verify with the local ranger district before your trip. Full disclaimer

At a Glance

  • Fossil Ridge Wilderness with panoramic views of the Sawatch and San Juan ranges
  • Unusual rock formations along the limestone ridge
  • Peak wildflower season in July and August on the open ridge
  • Remote wilderness character close to the populated Gunnison Valley
  • Continental Divide visible from the upper ridge section
viewswildflowersrock formations

Overview

Fossil Ridge Trail traverses the limestone spine of the Fossil Ridge Wilderness in Gunnison National Forest, delivering panoramic views of the Sawatch Range to the north and the San Juan Mountains to the south. The 12-mile strenuous out-and-back reaches elevations above 12,000 feet and is exposed throughout the ridge section.

The fossiliferous limestone of the ridge contains marine fossils from when this terrain was a shallow sea floor 300 million years ago. These fossils are protected on federal land and must not be collected, but they add a fascinating geological dimension to the hike.

The Route

The trail begins at the Fossil Ridge Trailhead and climbs steadily through aspen and spruce forest before breaking above treeline onto the limestone ridge. The ridge section follows a broad, rocky spine with views expanding progressively. The turnaround point is marked by the ridge's highest point and a trail junction with the Wilderness boundary.

When to Visit

Mid-July through September. The exposed ridge receives afternoon thunderstorms regularly in July and August; start early and plan to be off the ridge by noon in unsettled weather. September offers clearer weather and fewer crowds.

Practical Details

Vault toilet at trailhead. Carry all water; no sources on the ridge. Black bear food storage protocols apply. The 10 Essentials are essential for this exposed, high-altitude ridge hike.

Getting There

From Parlin, Colorado, drive south on County Road 887 and then follow forest road signs to the Fossil Ridge Trailhead. A high-clearance vehicle is recommended. Contact the Gunnison Ranger District for current directions.

Leave No Trace

This trail receives enough use that following Leave No Trace principles is important for preserving the experience for future visitors. Stay on the marked trail to prevent erosion. Pack out all waste. Avoid camping within 200 feet of water sources or the trail. Use existing fire rings only where campfires are permitted, and check current fire restrictions at checking conditions before you go before any visit. The trail and surrounding terrain remain in good condition because previous visitors have respected these norms.

Safety Considerations

The strenuous rating reflects the trail's general character under typical conditions. Weather, seasonal snow, and trail conditions can change the experience significantly. Carry the 10 Essentials on any full-day outing. Inform someone of your plans and expected return time before heading out, particularly on longer or more remote trails. Cell service varies throughout Gunnison National Forest and may be unreliable in canyon bottoms or remote terrain.

Trailhead Parking

Fossil Ridge Trailhead off Forest Road near Parlin, Colorado. Gravel pullout with vault toilet. No fee.

← Back to Gunnison National Forest

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Frequently Asked Questions

What is the Fossil Ridge Wilderness?
The Fossil Ridge Wilderness is a 33,000-acre wilderness area in Gunnison National Forest, characterized by a limestone ridge with fossil deposits and panoramic views.
Are there actual fossils on Fossil Ridge?
Yes. The limestone rock of Fossil Ridge contains marine fossils from the region's ancient seafloor past. Do not collect or disturb fossils, which are protected on federal lands.
How difficult is the Fossil Ridge Trail?
The trail is considered strenuous with 2,600 feet of gain over 6 miles one way. The high elevation (above 12,000 feet) and exposed ridge add to the difficulty.
When does the Fossil Ridge Trail open?
The ridge terrain is typically snow-free by mid-July. Check with the Gunnison Ranger District for current conditions before departure.