Overview
The Weminuche Wilderness is the largest wilderness area in Colorado at 499,771 acres, and the Pine River Trail offers one of the quietest entries into this vast roadless backcountry. While most hikers approach the Weminuche from Needleton via the Durango & Silverton train or from Silverton via various northern trailheads, the Pine River approach from the south sees significantly less traffic and provides a different character of the wilderness: the gradual, sustained transition from montane forest through subalpine zone to the high-alpine terrain at the upper end of the drainage.
The 12-mile out-and-back gains 2,000 feet from the trailhead near Vallecito Reservoir to the standard turnaround near the basin where the Pine River originates. The lower section passes through mature forest with good fishing access; the middle section climbs steadily through dense spruce-fir; the upper section opens onto the tundra and meadow terrain typical of the high Weminuche.
This is a committed day hike or an excellent first-night backpacking destination. The San Juan National Forest page covers the broader forest context and the permit situation for the Weminuche.
The Route
Miles 0 to 2.0: Pine River Valley Lower Section
From the trailhead near Vallecito Reservoir, the trail climbs gently through ponderosa pine and Gambel oak before entering the mixed forest zone. The Pine River runs alongside the trail through much of this section, providing fishing access and a reliable water source. Several horse outfitter campsites are present in the lower valley. The trail is wide and well-maintained in this section.
Miles 2.0 to 5.0: Wilderness Interior Climb
The trail enters more demanding terrain as it gains elevation into the dense spruce-fir forest of the mid-elevation Weminuche. The grade is steady but manageable. Side drainages enter from both sides of the valley. The river narrows and the canyon tightens as elevation increases. Wildlife sightings including black bear, elk, and deer are common in this section during morning hours.
Miles 5.0 to 6.0: Upper Basin Approach
The final mile before the turnaround climbs more steeply as the trail transitions from forest to subalpine meadow. The basin opens above treeline, revealing the rocky upper drainage of the Pine River watershed. This is the turnaround point for the standard route, though backpackers can continue deeper into the wilderness for multi-day routes.
When to Visit
July through September. The lower trail is accessible by mid-June in most years, but the upper section can hold snow into early July. September is often the best time for this route, fewer hikers, stable weather, and the beginning of fall color in the aspens visible from the valley.
Afternoon thunderstorms are possible in July and August. The upper section is exposed; plan to begin the descent by early afternoon if weather is building. Check current conditions and forecasts before departure.
What to Bring
Many hikers carry:
- 2 to 3 liters of water (with filter for creek refills)
- Layers for the temperature drop at higher elevation
- Bear canister for overnight trips
- Fishing gear if interested (Colorado license required)
Consider bringing:
- Trekking poles for the sustained climb and rocky upper terrain
- Insect repellent for early season near the river corridor
Individual needs vary. The 12-mile distance with 2,000 feet of gain is a meaningful day hike effort; pace accordingly.
Practical Details
Vault toilets are at the trailhead. No facilities in the wilderness. Practice Leave No Trace waste disposal; see LNT principles for backcountry specifics. Cell service is absent throughout. Free campfire permits are self-issue at the trailhead; campfires may be restricted during fire season.
For information on overnight backcountry camping procedures, see how to get a national forest camping permit. Bear canisters are not currently required in the Weminuche (as of 2026) but are strongly recommended; see bear canister requirements for context.
Getting There
From Bayfield on US-160 east of Durango, take County Road 501 north toward Vallecito Reservoir. Before reaching the reservoir dam, turn onto the appropriate forest road (FR 602) toward the Pine River Trailhead. The upper section of the road is rough; high-clearance vehicles are recommended. From Durango, allow approximately 1 to 1.5 hours for the drive. Verify current road conditions with the Columbine Ranger District before visiting.