Heart Lake Trail

Overview

A classic Yellowstone backcountry day hike or easy overnight, the Heart Lake Trail runs 15.1 miles total (out-and-back) with about 1,440 feet of gain. Expect a moderate effort in big country: long, mellow miles to a pass, a scenic drop past thermal features, and a broad, pebbly lakeshore framed by Mount Sheridan. Most hikers report 5 to 6.5 hours for the out-and-back.

Route Experience

From the trailhead south of Grant Village, you’ll find a bulletin board and a vault composting toilet before heading into lodgepole forest still recovering from the 1988 fires. The first ~5 miles are gentle until Paycheck Pass, where the landscape opens with views toward the Witch Creek watershed, Factory Hill, and your first look at Heart Lake. From there, the trail descends roughly 2.5 miles toward the shore, passing small hot pools and vents—beautiful, fragile, and absolutely off-limits to approach. The return is where you’ll feel the work: you’ll have to climb back from the lakeshore to the pass.

Why Hike It

If you like fewer crowds, long sightlines, and a big payoff at the end, this one delivers. The combination of a quiet approach, a legitimate backcountry lake, and a brush with a thermal area makes this an underrated gem. Anglers and backpackers use lakeshore camps for longer stays, and strong hikers sometimes add Mount Sheridan from the lake for a bigger day.

Permits, Rules, and Wildlife

Overnights at designated backcountry sites require a permit. Fishing (and any boating/float tubes) also require permits; follow food-storage rules to the letter. This is prime bear habitat—carry bear spray, hike in groups, make noise, and give wildlife plenty of space. Dogs are not allowed on this trail. A park entrance fee applies.

Conditions and Gotchas

Expect mosquitoes in July; bring repellent and consider a headnet. Depending on the season and chosen approach, you may encounter water crossings—late summer is often easier, but always assess before committing. Thermal areas are hazardous; stay on the established trail and give hot ground a wide berth. Afternoon storms are common; start early and pack layers.

Best Time to Hike

The trail is typically closed April 1 through June 30 for bear management, so plan for July–September. Aim for an early start for cooler temps, steadier footing on any potential fords, and softer light on the lake. Weekdays see fewer people; expect more biting insects in mid-summer and better shoulder-season vibes in September.