Timberline Lake Trail

Overview

This is a challenging, rewarding out-and-back to two classic Beartooth alpine basins—Gertrude Lake first, then the bigger prize: Timberline Lake set beneath the sheer walls of 12,500‑foot Silver Run Peak. Expect 9.1 miles total with about 2,080 feet of gain and a typical 4.5–5.5 hour outing. Dogs are allowed (some stretches allow off‑leash), and anglers prize both lakes for trout.

What the hike feels like

The first miles climb out of the West Fork of Rock Creek through the 2008 burn scar—sunny, stark snags, and surprisingly colorful with early‑summer wildflower regrowth (think waves of purple). Around mile three the trail finally tucks into greener, shadier forest and the scenery ramps up. Gertrude is a pleasant warm‑up; push a little farther for Timberline’s big‑room amphitheater views. Some hikers find the approach “underwhelming” until the lakes—fair critique—but those final miles pay it back.

Terrain, geology, and water

The Beartooths are old—ancient granitic and gneissic rocks shaped into cirques and overdeepened bowls by Pleistocene ice. You’ll see that glacial architecture around Timberline’s rim. The path is consistently steep in spots with rocky sections and at least one easy creek crossing near the lakes. Bring sturdy footwear.

Best time to hike

Snow lingers into June at these elevations; peak season is July–August. The broader window runs roughly June–October, with crisp fall color and occasional frost or even a dusting of snow in late September. Start early for cooler temps and softer light; afternoon storms and wind are common here.

Wildlife and safety

You’re in grizzly country—carry bear spray and know how to use it. Moose turn up here; give them generous space. Mosquitoes can be fierce in early summer around meadows and shorelines.

Tips

• Sun exposure is real through the burn—hat, sunscreen, and plenty of water help.
• Bug spray pays off mid‑summer.
• If you’re fishing, both lakes see action; mind wilderness regulations.

Getting there & parking

From US‑212, turn onto West Fork Road and follow it about 11 miles (pavement becomes good gravel) to the signed Timberline Trailhead. There’s a trailhead lot with a vault toilet and no parking fee. Low‑clearance vehicles are generally fine.