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Alpenstock is an outdoor gear retailer owned in Colorado, specializing in curated day hike equipment for Front Range and Rocky Mountain trails.

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Angeles National Forest

Mt. Islip Trail

USFS trail 239W05

The route in 3D

Fly this trail over real terrain

USGS and partner elevation data build the terrain, and the US Forest Service centerline draws the route.

1.1 mi · Typical grade 10 to 12%

About 700 ft between the route's high and low points. An estimate from US government elevation data, computed 2026-07-10; not measured in the field.

Trail facts

Length: 1.1 mi mapped
Grade: Typical grade 10 to 12%
Surface: native material
USFS-managed hiker season: year-round
USFS-managed uses: Hiking
Motorized status: Non-motorized (USFS designation)

Designation

National trail designation

National forest

Angeles National Forest

Length is the trail as the Forest Service maps it, not a trip distance. Hike out and back and you will cover it twice; check the shape of the route before you count on the figure.

This record is a snapshot of U.S. Forest Service data retrieved on 2026-07-09. It does not reflect current closures, conditions, or seasonal orders. Check with the local ranger district before you go.

Elevation

About 630 ft of climbing one way, measured in the harder direction.

High point: About 8,250 ft
Low point: About 7,550 ft

Estimates, derived from US government elevation data sampled along the USFS-mapped route, computed 2026-07-10. We have not measured these figures in the field.

Plan a day on this trail

A day here means a typical grade of 10 to 12%. Tell the Trip Builder where you are headed and it assembles a day-specific kit with weather, daylight, and terrain in mind.

Data: U.S. Forest Service, retrieved 2026-07-09.

Mt. Islip Trail — California · Alpenstock

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