Pets allowed
Allowed with Restrictions
Elevation Gain
2,572.00 ft (783.95 m)
Trail type
Loop
Distance
17.90 mi (28.81 km)
Please respect the outdoors by practicing Leave No Trace. Learn more about how to apply the principles of Leave No Trace on your next outdoor adventure here.

Thielsen / Diamond Lake Loop is a 18-mile scenic route located in Oregon’s Umpqua National Forest. The route begins (and ends) at Diamond Lake and traverses east towards Mount Thielsen through the Mount Thielsen Wilderness. The loop covers relatively gentle terrain through peaceful pine forests and scenic alpine meadows. It is rated as easy to moderate and can be completed as a long day trek or part of an overnight camping trip. 

The route starts at the Howlock Mountain Trailhead, which provides easy access to Mount Thielsen Wilderness. At the trailhead, there are also two developed campsites for hikers and horseback riders. 

Along Howlock Mountain Trail, the loop heads east through lodgepole pine forest. The trail passes Timothy Meadow, enters Thielsen Wilderness, and ultimately joins the Pacific Crest Trail (PCT).

PCT leads south towards Mount Thielsen, a prominent jagged peak in the southern Cascade Mountain Range. Its jagged spire stands out among nearby mountains as it rises 9,182 feet above sea level. 

The trail skirts around the base of the west side of the mountain and intersects with Mount Thielsen Trail #1456. Follow the Mount Thielsen Trail #1456 west to the Spruce Trail, and then follow the Spruce Trail north back to the Howlock Mountain Trail. From the junction with Howlock Mountain Trail, retrace your steps back to the Howlock Mountain Trailhead and Diamond Lake. 

PASSES AND PERMITS

Certain trailheads within Umpqua National Forest require a pass and/or permit. For detailed information please visit https://www.fs.usda.gov/main/umpqua/passes-permits/recreation

ADDITIONAL INFORMATION

Howlock Mountain Trailhead

Diamond Lake Resort

Logistics + Planning

Preferable season(s)

Spring
Fall

Congestion

Moderate

Parking Pass

$5.00

Open Year-round

Yes

Pros

Peaceful forests. Peak bagging opportunities. Meadows.

Cons

Mosquitos in the summer.

Trailhead Elevation

5,334.00 ft (1,625.80 m)

Highest point

7,345.00 ft (2,238.76 m)

Features

Near lake or river
Backcountry camping
Wildlife
Big vistas
Geologically significant
Wildflowers

Typically multi-day

No

Suitable for

Horseback

Permit required

No

Location

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