Observation Peak Trail

Observation Peak Trail is a 9.6-mile out-and-back from Cascade Lake Trailhead (4K5), usually a 5–6-hour hike. It crosses open meadows to Cascade Lake, then climbs to a rocky summit with an old fire lookout. The official mileage includes the return to the same trailhead. The 4.4-mile Cascade Lake walk shares the approach but turns back at the lake; it is a shorter trip with a different endpoint.

The lower route crosses open meadows toward the lake, where wildflowers and wildlife are often seen. The approach moves through older lodgepole pine, then forest-edged meadows near the water. Cascade Lake is a natural decision point: stop here for the shorter walk, or continue beyond it for the summit. This stretch can be wet and snowy through July.

Beyond Cascade Lake, the trail climbs about 1,400 feet over 2.6 miles through whitebark pine forest. The upper route opens into alpine meadows and small tree pockets before reaching the summit. This is the sustained, strenuous part of the walk. There is no water beyond Cascade Lake, so carry enough for the entire route before leaving the lake area.

The summit is a rocky outcrop with a no-longer-staffed fire lookout. From here the view reaches across forest and lakes toward the Canyon rim, Hayden Valley and the Yellowstone River; Grebe Lake lies below the ridge. The rocky foreground and lake make this the route's signature view.

A dedicated lot serves Cascade Lake Trailhead; the nearest restrooms are at Cascade Lake Picnic Area to the east. No trail reservation or activity fee is listed, though park entrance fees may apply. Pets are not allowed. Grizzly bears frequent this area, and the strenuous hike is not recommended for people with heart or respiratory problems. The route is listed for summer and fall; snow and wet ground can linger into July.