Colorado trails · St. Louis Divide Trail
St. Louis Divide Trail
A 12.1-mile out-and-back in Colorado, with 2,227 ft of climbing, topping out at 12,636 ft. Reaches Saint Louis Pass and other pass/summit destinations. Managed by USFS Sulphur Ranger District.
Elevation profile
The climbing leans toward the first third: 51% of the ascent falls between mile 0.0 and mile 4.0. It gives back about 2,529 ft along the way, so it rolls rather than climbing steadily.
3-D terrain
USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5
Reaches
- Saint Louis Pass (pass)
- Mount Nystrom (summit)
Heads up
Daylight at the trailhead
On October 14, 2026 — the day this page was generated — first light reaches this trailhead at 6:45 a.m., the sun rises at 7:12 a.m. and sets at 6:26 p.m., and the last usable light fades about 6:53 p.m. (MDT) — 11 h 13 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 24.1-mile round trip takes roughly 11 h 09 min, so leaving the trailhead at sunrise puts you back around 6:22 p.m. — 4 min before sunset.
Loop options
- St. Louis Divide Trail + Saint Louis Divide Trail — 6.6 mi loop, 460 ft gain
- Bottle Pass Trail + St. Louis Divide Trail + Keyser Ridge Trail — 6.6 mi loop, 2,019 ft gain
- Bottle Pass Trail + Bottle Peak Trail + St. Louis Divide Trail — 8.8 mi loop, 3,158 ft gain
Nearby trails
- Ute Peak Trail — 7.4 mi
- High Lonesome Trail — 14.5 mi
- Arapaho Pass Trail — 18.9 mi
- Gore Range Trail — 23.0 mi