Trout Lake Loop

Trout Lake Loop is a short, 1.2-mile climb to a clear mountain lake tucked into Yellowstone's Lamar Valley — one of the best places in the park to watch river otters and, in early summer, hundreds of cutthroat trout crowding the inlet stream to spawn. The trail is quick but front-loads a steep push, then rewards you with a flat, quiet loop around the water. Come at dawn in June for the wildlife show and an empty shoreline.

At a Glance

• Activity: Hiking / wildlife watching / fishing
• Difficulty: Easy — short, but the first ½ mile is a steep grunt
• Time to complete: 45 min – 1.5 hrs (longer if you linger for wildlife)
• Best season: Late May – September
• Dogs: No — pets are banned on all Yellowstone trails
• Permit / fee: Park entrance fee required; fishing needs a Yellowstone fishing permit
• Trailhead: Roadside pullout on the Northeast Entrance Road, Lamar Valley

What is Trout Lake Loop?

Trout Lake is a small, spring-fed lake in the northeast corner of Yellowstone, ringed by forest and open meadow with the Absaroka peaks rising behind it. The hike is short but doesn't ease you in — the trail climbs steeply for the first half-mile from the road, gaining most of its elevation right away. Once you crest that rise, the lake opens up and the path flattens into an easy loop around the shoreline.

It's a favorite for families and anyone wanting a big Yellowstone payoff without a big-mileage day. The water is clear enough to watch fish from the bank, the meadows fill with wildflowers in summer, and the setting is classic Lamar Valley — the part of the park people call "America's Serengeti" for its wildlife density.

The one honest caveat: it's popular and small. On a July afternoon the tiny pullout is full and the shoreline has company. Early or late is when it feels like the wild place it is.

How hard is Trout Lake Loop?

Easy overall — it's only 1.2 miles with about 243 feet of gain — but nearly all of that climb is packed into the first half-mile straight up from the trailhead. Expect to breathe hard for ten minutes, then coast. Kids do it regularly, but the opening pitch is steep enough that it's a workout, not a stroll. The loop around the lake itself is flat and gentle. Footing is dirt trail; it can be muddy or slick in spring and after rain.

How do I get there?

The trailhead is a small pullout on the north side of the Northeast Entrance Road in the Lamar Valley, in the northeast section of the park between Tower-Roosevelt and the Northeast Entrance at Silver Gate/Cooke City. It's near Pebble Creek and easy to blow past — there's no big sign, just a roadside pullout with room for a handful of cars.

• Nearest hubs: Cooke City / Silver Gate (just outside the Northeast Entrance) or Tower-Roosevelt to the west.
• Parking: very limited — a small pullout that fills midday in summer. Arrive early or in the evening.
• Cell service: don't count on it. Download maps ahead of time.

When is the best time to go?

• Best months: late May through September, once the snow clears.
• The signature window — June: in late May and June, native cutthroat trout run up the lake's inlet stream to spawn, packing the shallows. River otters (and sometimes bears and osprey) show up to feed on them. It's one of the most reliable wildlife spectacles in this part of the park.
• Best time of day: early morning or evening, both for wildlife activity and to beat the crowds at the small pullout.
• When to skip it: midday in July–August (hot, crowded, no parking), and late fall through spring, when the trail is snowbound and icy.

What's permitted here?

• Park entrance fee: required to enter Yellowstone (a 7-day vehicle pass; check the current NPS rate before you go).
• Dogs: not allowed. Yellowstone prohibits pets on all trails, boardwalks, and in the backcountry — this trail is a hard no for dogs.
• Fishing: allowed with a Yellowstone-specific fishing permit (the state license does not cover the park). Trout Lake has special regulations to protect its native cutthroat — historically catch-and-release with restrictions — so read the current park fishing rules before you cast.
• Wildlife distance rules: stay at least 100 yards from bears and wolves and 25 yards from all other wildlife, including the otters. It's the law in Yellowstone.
• Managing agency: National Park Service — Yellowstone National Park.

What should I know before I go?

• This is grizzly country. The Lamar Valley has one of the densest bear populations in the lower 48. Carry bear spray, know how to use it, make noise, and never approach wildlife.
• What to bring: bear spray, water, sun protection (little shade at the lake), and a layer — mornings are cold even in summer.
• The climb is up front. Pace yourself on the first half-mile; it's the whole workout.
• Leave No Trace, and give the spawning fish and otters room — this is a sensitive spot that draws crowds, and the wildlife is why. Don't crowd the inlet stream.
• Weather turns fast at elevation; afternoon thunderstorms are common in summer.

Insider tips

• Go for the June otter-and-trout show. The inlet stream at the far side of the lake is the spot — that's where the cutthroat pile up and the otters hunt. Bring binoculars.
• Beat the pullout. With only a handful of parking spaces, early morning isn't just better light — it's the difference between hiking and circling for parking.
• Bank the steep part first, then relax. Once you're at the lake, the loop is flat — plan to spend your time and energy up top, not on the climb.
• Pair it with a Lamar Valley wildlife drive at dawn or dusk for wolves and bison — the trailhead is right in the heart of it.

Frequently Asked Questions

Is Trout Lake Loop hard? No — it's an easy 1.2-mile loop, but nearly all of its 243 feet of climbing is in the steep first half-mile. After that initial push it flattens out around the lake. Most families handle it fine.

Can you bring dogs to Trout Lake? No. Yellowstone bans pets on all trails, so dogs are not allowed on Trout Lake Loop.

Do you need a permit? You need a park entrance fee to be in Yellowstone. Hiking the trail needs no separate permit, but fishing requires a Yellowstone-specific fishing permit with special regulations for Trout Lake.

What's the best time to hike Trout Lake? Late May through September. June is the standout — cutthroat trout spawn in the inlet stream and river otters come to feed. Go early morning to catch wildlife and find parking.

How long does Trout Lake Loop take? Most hikers finish in 45 minutes to an hour and a half, though it's worth lingering longer if the otters or spawning trout are out.