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Colorado trails · Tonahutu Creek-Flattop Junction Trail

Tonahutu Creek-Flattop Junction Trail

A 8.3-mile out-and-back in Colorado, with 2,799 ft of climbing, topping out at 12,270 ft. Reaches Granite Falls and other pass/summit/waterfall destinations. Managed by Rocky Mountain National Park.

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Length
8.3 mi
Elevation gain
2,799 ft
Highest point
12,270 ft
Difficulty
Expert
Max grade
24%
Steepest mile
+741 ft
Tread at ≥10% grade
2.4 mi
Shape
out-and-back
Surface
dirt
Dogs
no
Bikes
no
Horses
yes
Managed by
Rocky Mountain National Park

Elevation profile

9,421 – 12,222 ft12345678

The climbing leans toward the middle third: 51% of the ascent falls between mile 2.8 and mile 5.5. It climbs almost continuously, with little descent to recover on.

3-D terrain

3-D terrain view of Tonahutu Creek-Flattop Junction Trail

USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5

Reaches

Heads up

Stream ford: expect at least one unbridged crossing.
Terrain graded T2 (SAC scale).

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 6:25 p.m., and the last usable light fades about 6:52 p.m. (MDT) — 11 h 12 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 16.6-mile round trip takes roughly 8 h 56 min, so leaving the trailhead at sunrise puts you back around 4:09 p.m. — 2 h 16 min before sunset.

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