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Mosquito Range · Colorado 13er

East Ridge

West Dyer Mountain, 13,056'

DifficultyClass 2
Round trip3 mi
Elevation gain1,400'
TrailheadIowa Gulch
Trailhead elevation11,650'

Conditions on the summit

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Afternoon storm risk is the line that matters. Everything else is comfort. In summer, plan to be off the ridge before the build-up starts, not as it starts. Forecast for the summit point, adjusted for its elevation · data from Open-Meteo.

Colorado 13er · East Ridge

Overview

West Dyer Mountain is the western shoulder of Dyer Mountain, above Iowa Gulch east of Leadville. This short route leaves the road, crosses the Dyer amphitheater between the two peaks, climbs scree to their saddle, and follows West Dyer's east ridge to the top.

It is Class 2 with no trail. The amphitheater has cliffs and a rocky drainage to get around, and the scree at its north end is the steepest part.

The round trip is only about 3 miles with 1,400 feet of gain, usually 3 hours. It sees few climbers.

Plan of the day

Start by

By 7 a.m.

Turnaround

Be at the saddle by 11 a.m.

Crux

The loose slope that closes off the top of the bowl, just below the saddle.

Route-finding

No trail. Keep east of the rocky gully in the bowl, climb above the cliffs to a small lake, then aim for the saddle.

Water

A small lake in the amphitheater. Filter it.

Getting to the trailhead

Trailhead

Iowa Gulch

Find it on a map

From US 24 in the south end of Leadville, turn east on Monroe Street, then right (south) on County Road 2 (Toledo Street). Follow the paved road about 3.8 miles to a fork, then turn left on a dirt road that any car can drive and follow it about 3 miles up Iowa Gulch.

There is no marked trailhead for this route. Park along the road near 11,650 feet.

Before you go

Check these the week of your climb.

Official forecast

The National Weather Service forecast for the summit area, hour by hour. Look for thunderstorm chances and wind above treeline.

NWS point forecast →

Directions to the trailhead

Iowa Gulch. Road conditions near the trailhead change after storms. Check your clearance and have a backup plan for a lower lot.

Get directions →

Roads and highways

Closures, construction and winter conditions on the highways that get you there.

COtrip road conditions →

Closures and fire rules

Trail closures, fire bans and other alerts from the Forest Service in Colorado. For the latest on your trailhead, call the local ranger district.

Forest Service alerts →

Snow on the route?

From fall through early summer, any snow slope can slide. Check the avalanche forecast before you go.

Avalanche forecast →

Cell signal

Most trailheads and many summits have little or no signal. Check coverage near the trailhead and carry a satellite messenger or beacon if you can.

FCC coverage map →

Less traffic, less margin

This describes the route on a dry summer day. Most 13ers see few people, so there may be no one along behind you. Check recent conditions the week you go, carry a map, tell someone your plan, and turn around when the day tells you to.