Indian Peaks ยท Easy alpine lake

Long Lake

Long Lake is one of the easiest and most popular hikes in Brainard Lake Recreation Area, a nearly level walk along a subalpine lake with big Indian Peaks and Continental Divide views, reached from the Long Lake Trailhead once the upper road opens in July.

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Long Lake quick facts

Distance / loop
Short and easy. Long Lake is a nearly level out-and-back or small loop from the Long Lake Trailhead. You can walk out along the lake and turn around, or close a loop using the Jean Lunning Trail along the south shore and the Niwot Cutoff. (The Forest Service does not publish an official trail distance.)
Elevation
High subalpine. The Forest Service lists Brainard Lake Recreation Area at about 10,600 feet, and Long Lake sits right in that band, roughly 10,500 feet, just below the Continental Divide.
Difficulty
Easy. It is one of the gentlest, most popular walks in the whole recreation area, which makes it a favorite for families and for anyone still adjusting to the altitude.
Access
The Long Lake Trailhead is an upper trailhead inside Brainard Lake Recreation Area. A timed-entry reservation is required to park inside during the operating season, and the upper lots do not open until the July snowmelt. See our Brainard Lake guide for the full timed-entry and fee details.
Dogs
Allowed on a hand-held leash. Long Lake is in the Indian Peaks Wilderness, where dogs must be physically leashed at all times, so the voice-and-sight approach from Boulder's foothill trails does not apply here.
Permits
No wilderness permit is needed for a small-group day hike. Overnight camping in the Indian Peaks Wilderness requires a backcountry permit (June 1 through September 15), and large groups of 8 to 12 need a day-use permit in that window. Bear canisters are required year-round near the trailheads.
Fee
The timed-entry parking reservation is $16 per personal vehicle plus a $2 reservation fee (America the Beautiful, senior, and access passes drop it to just the $2 fee, but you still must book). Walking or biking in from the year-round Gateway Trailhead is a $10 day-use fee with no reservation.
Best season
July through September, once the upper lots open and the trail is snow-free, for wildflowers and open Indian Peaks views. Snow typically lingers until July at this elevation.

Long Lake at a glance

Long Lake is the gentle one. Of all the hikes in Brainard Lake Recreation Area, this is the easiest and most popular: a nearly level walk that hugs a long subalpine lake set in a glacially carved valley below the Continental Divide. The Forest Service lists the recreation area at about 10,600 feet, and Long Lake sits right in that band, roughly 10,500 feet, so the views of the Indian Peaks come without a hard climb. It's the walk people bring families on, the one that works when someone in the group is still adjusting to the altitude, and the launch point for bigger days deeper into the Indian Peaks Wilderness.

The trail and the loop option

Most people start with the simplest version: an out-and-back along the north shore from the Long Lake Trailhead, turning around whenever they've had their fill of lake and peaks. To make a loop of it, you can follow the Jean Lunning Trail along the south side of the lake and connect back with the Niwot Cutoff. The Forest Service doesn't publish an official trail distance, but by Brainard standards it's short and flat. If you want more, the trail continues past Long Lake toward Lake Isabelle, climbing into a bowl right beneath the Divide.

Reservations, access, and fees

The Long Lake Trailhead is an upper trailhead inside the recreation area, and during the operating season you need a timed-entry parking reservation from Recreation.gov to park there. The upper lots don't open until the snow melts in July, so early-season visitors either wait or walk farther. The reservation runs $16 per personal vehicle plus a $2 reservation fee; an America the Beautiful, senior, or access pass drops it to just the $2 fee, though you still have to book. If you'd rather not deal with a reservation, you can park at the year-round Gateway Trailhead and walk or bike in for a $10 day-use fee. Our Brainard Lake guide walks through the whole timed-entry system in detail.

Wilderness rules and permits

Long Lake sits inside the Indian Peaks Wilderness, so the wilderness rules apply from the moment you leave the trailhead. You don't need a permit for a small-group day hike, but overnight camping requires a backcountry permit from June 1 through September 15, large groups of 8 to 12 need a day-use permit in that window, and bear canisters are required year-round near the trailheads. Group size is capped at 12, and motorized or mechanized travel, bikes included, is not allowed on wilderness trails. It's a genuine wilderness, close to town but managed like the backcountry it is.

Dogs at Long Lake

Dogs are welcome, but they have to be on a hand-held leash the entire time. That's the Indian Peaks Wilderness rule, and it's firm: the voice-and-sight approach that works on some Boulder foothill trails does not apply up here. Plan on a physical leash from the parking lot to the lakeshore and back, and pack out what your dog leaves behind.

Swimming and the water

This isn't a swim lake in the way Boulder Reservoir is. There's no swim beach, no lifeguard, and no facilities: Long Lake is cold, high alpine water in a fragile subalpine basin, and most visitors come to walk, fish, and take in the peaks rather than get in. If you're after an actual swim beach, the reservoir down in town is the better call. Up here the appeal is the still water and the reflected Indian Peaks.

Best time to go

Aim for July through September. Snow typically lingers until July at this elevation, and that's also when the upper lots open, so earlier than that you'll be parking low and adding miles. Midsummer brings wildflowers and snow-free trail; late September thins the crowds and turns the willows gold. Whenever you go, book an early entry time: summer weekend reservations go fast and the upper lots fill. Once the road is gated in mid-October, Long Lake shifts into a winter ski and snowshoe outing reached from the Gateway Trailhead.

Nearby trails and guides

Recommended nearby

A few local spots we'd point a Long Lake day toward.

Gear / rental

[CLIENT SLOT: featured gear or day-pack rental for Brainard Lake]

[One honest line: where to grab traction, a day pack, or bear canister before heading up.]

Cafe

[CLIENT SLOT: featured cafe in Ward or Nederland]

[One honest line: coffee or a bite on the drive up or the way back down.]

Lodging

[CLIENT SLOT: featured lodging near Nederland]

[One honest line: a place to stay for an early-morning trailhead start.]

Long Lake FAQ

How hard is the Long Lake hike?

It's easy. Long Lake is one of the gentlest and most popular hikes in Brainard Lake Recreation Area, a nearly level walk along the lakeshore from the Long Lake Trailhead. The main challenge isn't the terrain, it's the altitude: the trail sits in the high subalpine at roughly 10,500 feet, so take it slow if you're not acclimated. Families and first-timers do it all the time.

Do you need a reservation to hike Long Lake?

Yes, to drive in. The Long Lake Trailhead is an upper trailhead inside Brainard Lake Recreation Area, and a timed-entry parking reservation from Recreation.gov is required to park there during the operating season. The upper lots don't open until the July snowmelt. If you'd rather skip the reservation, you can park at the year-round Gateway Trailhead and walk or bike in for a $10 day-use fee. Our Brainard Lake guide has the full reservation and fee breakdown.

When is Long Lake open?

The Long Lake Trailhead is an upper trailhead, so it opens later than the rest of the recreation area. The main gate opens in mid-June and closes in mid-October, but access to the upper trailheads like Long Lake only opens after the snow melts in July. Snow typically lingers until July at this elevation, and closing dates vary with the weather. In winter the road is gated to cars and the area becomes a ski and snowshoe destination.

Are dogs allowed at Long Lake?

Yes, on a hand-held leash. Long Lake lies within the Indian Peaks Wilderness, where dogs must be physically leashed at all times, with no exceptions. The voice-and-sight tag that works on some Boulder foothill trails does not apply here, so plan on a leash from the parking lot to the lake and back.

Can you make Long Lake a loop?

Yes. The simplest version is an out-and-back along the north shore. To turn it into a loop, you can follow the Jean Lunning Trail along the south side of the lake and connect back with the Niwot Cutoff. Many hikers also continue past Long Lake toward Lake Isabelle, deeper into the Indian Peaks Wilderness beneath the Continental Divide, for a longer day.

Sources

Facts on this page are drawn from these authoritative sources: