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ForestMatters, LLC

Diamond Lake Loop

Umpqua National Forest, Oregon · 3 min read

Distance
11.6 mi
Elevation Gain
150 ft
Difficulty
easy-moderate
Route Type
Loop
Best Season
May through October
Dog Friendly
Yes
Difficulty Score
4 / 10

Trailhead Amenities

Restroom
Flush Restroom
Parking
Fee Required
Cell Service
Limited
Water
At Trailhead
Camping
Developed
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Conditions, regulations, and fees change frequently. Verify with the local ranger district before your trip. Full disclaimer

At a Glance

  • Panoramic views of Mount Thielsen and Mount Bailey from the lake
  • Paved and packed gravel loop accessible to cyclists and hikers
  • Clear lake water and excellent rainbow trout fishing
  • Diamond Lake Resort services at the midpoint
  • Popular with families and casual recreational hikers

Overview

The Diamond Lake Loop circles one of the most scenic mountain lakes in the Oregon Cascades, passing within view of Mount Thielsen's distinctive spire to the northeast and the broad forested cone of Mount Bailey to the southwest. The route follows a paved path and packed gravel trail around the lake's full perimeter, and it is as popular with cyclists as with hikers.

Diamond Lake sits at 5,183 feet within Umpqua National Forest and is one of the largest natural lakes in the Oregon Cascades. The lake is managed for rainbow trout, and the fishery draws anglers from across the region. Diamond Lake Resort, on the western shore, offers boat rentals, food service, and lodging.

The Route

South Campground to Resort (Mile 0 to 4.0)

Starting from the South Campground area, the loop travels counterclockwise around the lake. The southern section passes through lodgepole pine forest with lake views opening at several points. The paved path is smooth and relatively flat throughout.

Resort and Western Shore (Mile 4.0 to 6.5)

Diamond Lake Resort sits on the western shore at mile 4. A restaurant and store provide a natural midpoint rest. The western shore section is the widest viewpoint of Mount Thielsen to the northeast.

Northern Shore to Campground Loops (Mile 6.5 to 9.8)

The northern and eastern shore sections are more forested with less open lake access. The trail here is packed gravel rather than paved. This section passes several campground loops that can be used as alternate starting points.

Return to South Campground (Mile 9.8 to 11.6)

The loop returns through the South Campground area and back to the starting point. The final section is paved.

When to Hike

May through October covers the full season. The lake is usually accessible by late May after winter snowmelt. Summer weekends bring large crowds at Diamond Lake Resort; early morning starts provide the best experience.

September is an excellent time for fewer crowds and excellent mountain views in clear autumn air.

Winter skiing and snowshoeing are possible around the lake when snow conditions allow.

What to Bring

Many hikers carry 1.5 to 2 liters of water for this moderate-length flat loop. Drinking water is available at the resort and campground areas. Individual needs vary with temperature.

Cyclists should bring a helmet. Hikers benefit from comfortable footwear; the packed gravel sections are easy underfoot.

Trailhead Access

Multiple trailheads exist around the lake. Diamond Lake Resort and the South Campground day-use area are the most common starting points. A day-use parking fee may apply in the campground areas (as of 2026). No trail permit required.

Dogs allowed on leash throughout the loop.

Nearby

The Mount Thielsen Trail departs from a trailhead just off Highway 138 adjacent to the Diamond Lake area and provides a dramatic contrast for those wanting both a lake loop and a summit challenge. The Rogue-Umpqua Divide Trail is accessible from the broader Diamond Lake area.

Check current conditions and campground availability at Checking Conditions Before You Go. Follow Leave No Trace 7 Principles around the lakeshore.

Trailhead Parking

Diamond Lake Resort or Diamond Lake Campground. Large paved lots with restrooms. No trail fee, though campground day-use fee may apply as of 2026.

← Back to Umpqua National Forest

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Frequently Asked Questions

How long does the Diamond Lake Loop take?
Hikers typically complete the 11.6-mile loop in 4 to 5 hours at a relaxed walking pace. Cyclists often complete it in 1 to 1.5 hours.
Can you cycle the Diamond Lake Loop?
Yes, the loop is one of the most popular cycling destinations in the Oregon Cascades. Bike rentals are available at Diamond Lake Resort.
Is Diamond Lake Loop dog friendly?
Yes, dogs are allowed on leash along the trail. The lake is accessible but dogs should not be allowed to disturb the managed trout fishery.