Illinois Pass
Illinois Pass Trail is a 7.3 miles trail in Arapaho and Roosevelt National Forests, Colorado. The Forest Service rates it trail class 3, developed. It is open to hiking, horse and pack stock, mountain biking, motorcycle, atv, e-bikes, snowmobile, snowshoeing and cross-country skiing.
Trail conditions, closures and hazards are not tracked here. The Arapaho and Roosevelt National Forests 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 | 40.3685, -106.0134 · Directions ↗ |
| Other end | 40.3685, -106.0134 · 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 6 segments.
The trail
| Length | 7.3 miles |
| Trail class | 3, developed |
| Type | snow trail, land trail |
| Surface | native material, snow |
| Typical grade | 12-20 percent, 8-10 percent |
| Typical tread width | 18-24 inches, 96-120 inches |
| Motor vehicles | Open to at least one motorized use |
| Accessibility | Not evaluated |
| National designation | National Scenic or Historic Trail |
| Trail numbers | 25, SNO-25 |
| Forest | Arapaho and Roosevelt National Forests (unit 0210) |
| 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
| Hiking | Allowed 06/15 to 11/15 (month/day) |
| Horse and pack stock | Allowed 06/15 to 11/15 (month/day) |
| Mountain biking | Allowed 06/15 to 11/15 (month/day) |
| Motorcycle | Allowed 06/15 to 11/15 (month/day) |
| ATV | Allowed 06/15 to 11/15 (month/day) |
| E-bikes | Allowed 06/15 to 11/15 (month/day) |
| Snowmobile | Allowed 11/16 to 05/31 (month/day) |
| Snowshoeing | Allowed 11/16 to 05/31 (month/day) |
| Cross-country skiing | Allowed 11/16 to 05/31 (month/day) |
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
No federal campground is recorded within five miles of the trail. Dispersed camping is allowed on most National Forest land outside posted closures. The forest office has the current rules.
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.
Explore
Park units nearby
Historic places nearby
Reference
Questions people ask
How long is the Illinois Pass Trail?
7.3 miles, the sum of the 6 segments the Forest Service records under this name in Arapaho and Roosevelt National Forests.
Source: Forest Service trail layer
What is allowed on the Illinois Pass Trail?
hiking, horse and pack stock, mountain biking, motorcycle, atv, e-bikes, 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 Illinois Pass Trail start?
The line begins at 40.3685, -106.0134 and ends at 40.3685, -106.0134. 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 Illinois Pass 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 Illinois Pass Trail?
No federal campground is recorded within five miles of the trail. Dispersed camping is allowed on most National Forest land outside posted closures. The forest office has the current rules.
Source: Arapaho and Roosevelt National Forests official page
How developed is the Illinois Pass Trail?
Trail class 3, which the Forest Service describes as 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 Illinois Pass Trail?
The typical grade is 12-20 percent on most segments and 8-10 percent on others. The typical tread is 18-24 inches wide.
Source: Forest Service trail layer
Is the Illinois Pass Trail a national trail?
Yes. The record marks it as a National Scenic or Historic Trail.
Source: Forest Service trail layer
Who manages the Illinois Pass Trail?
Arapaho and Roosevelt National Forests, Forest Service unit 0210. The trail is in Colorado.
Source: Arapaho and Roosevelt National Forests official page
Source
This page is built from 6 segments named ILLINOIS PASS in the Forest Service TrailNFS_Publish layer, administrative unit 0210. 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.