Porcupine Winter
Porcupine Winter Trail is a 9.9 miles snow trail in San Juan National Forest, Colorado. 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 San Juan 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 end | 37.2716, -106.8732 · Directions ↗ |
| Other end | 37.2041, -106.8953 · 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
| Length | 9.9 miles |
| Trail class | 4, highly developed |
| Type | snow trail |
| Surface | snow |
| Typical grade | 5-8 percent |
| Typical tread width | 96-120 inches |
| Motor vehicles | Open to at least one motorized use |
| Accessibility | Not evaluated |
| Trail numbers | SNO-705 |
| Forest | San Juan National Forest (unit 0213) |
| States | Colorado |
| Detail published | management 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
| Snowmobile | Allowed 11/15 to 04/15 (month/day) |
| Snowshoeing | Allowed year-round |
| Cross-country skiing | Allowed 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
- WildfireSwiss Roll
11 mi from the trail midpoint · 775 acres · 0% contained
- PrescribedWolf Creek Piles Rx
17 mi from the trail midpoint · 1 acres
Distance is to the reported incident point, not the fire edge. Closure orders are on the forest's official page.
Reference
Questions people ask
How long is the Porcupine Winter Trail?
9.9 miles, the sum of the 1 segment the Forest Service records under this name in San Juan National Forest.
Source: Forest Service trail layer
What is allowed on the Porcupine Winter Trail?
snowmobile, snowshoeing and cross-country skiing. The trail is open to at least one motorized use. Some uses are seasonal. The allowed uses section lists the dates.
Source: Forest Service trail layer
Where does the Porcupine Winter Trail start?
The line begins at 37.2716, -106.8732 and ends at 37.2041, -106.8953. 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 Porcupine Winter 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 Porcupine Winter Trail?
Blanco River Group Campground (4.1 mi) is within five miles of the trail. Site counts and booking links are on Campsite Atlas.
Source: Campsite Atlas
How developed is the Porcupine Winter 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 Porcupine Winter Trail?
The typical grade is 5-8 percent. The typical tread is 96-120 inches wide.
Source: Forest Service trail layer
Who manages the Porcupine Winter Trail?
San Juan National Forest, Forest Service unit 0213. The trail is in Colorado.
Is there a fire near the Porcupine Winter Trail?
2 active incidents within 50 miles of the trail midpoint as of 2026-09-18, the nearest Swiss Roll at 11 miles. Check the forest's closure orders before you go.
Source: Fire nearby
Source
This page is built from 1 segment named PORCUPINE WINTER in the Forest Service TrailNFS_Publish layer, administrative unit 0213. 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.