Cobalt Lake

Overview

Cobalt Lake is a classic Two Medicine objective: a quiet, cobalt-blue basin ringed by cliffs and high peaks. It’s a longer day but a straightforward out-and-back, and the payoff is a serene lake that feels tucked away from the busier corridors.

Route Snapshot

Start from the Two Medicine South Shore/boat dock area and follow mostly forested miles with occasional lake peeks. Make the short spur to Rockwell Falls—totally worth it—then continue as the trail switchbacks into the upper basin. Expect several footbridges en route and a steeper final push into the cirque beneath Chief Lodgepole Peak. The round-trip is roughly 11–11.2 miles with about 1,400–1,600 feet of gain. If you’re feeling strong, you can extend beyond the lake toward Two Medicine Pass for bigger views.

What Makes It Special

The lake’s color really does live up to its name. On calm days the water mirrors the surrounding walls; on windy days, the waves add drama. It’s an excellent lunch stop, and there’s a designated backcountry campsite nearby for those with permits.

Wildlife

Keep your eyes peeled in the lower, marshy stretches for moose. Marmots are common around talus near the lake, and on clear days you might spot mountain goats high on the cliffs. Bears roam the area—carry bear spray, make noise, and give all wildlife plenty of space, especially during late-summer berry season.

Season and Trail Conditions

You’ll find the most reliable, snow-free conditions from mid-July through September. Early season (May–June) can bring lingering snow, high/fast creek approaches, and not-yet-installed seasonal bridges. Fall can turn wintry quickly, and some bridges are removed by late September. This isn’t a winter route.

Logistics

There are restrooms in the developed Two Medicine area before you start; don’t expect facilities on the trail or at the lake. No potable water is provided—bring a filter to treat streams. Cell service is spotty; download maps ahead of time. A seasonal tour boat across Two Medicine Lake can shave miles off the approach—check schedules before banking on it. Dogs aren’t allowed on park trails.

Best Time to Visit

Hit the trail early mid-July–September for the smoothest travel, cooler temps, calmer winds, and better wildlife viewing. Morning light is nice on the cliffs above the lake; by afternoon the basin often gets breezier and buggier.

Is It Worth It?

If you like a moderate challenge with a quiet, rewarding destination, yes. The combo of waterfall stop, classic Two Medicine scenery, and a vividly colored alpine lake makes this an underrated gem compared to the park’s headline hikes.