Fern Lake Trail

Overview

A classic east-side river-to-lake hike, Fern Lake delivers moving water, a legit waterfall, and wide-open peak views at a serene subalpine lake. Expect roughly 7.5–7.6 miles total (out-and-back) with about 1,400–1,476 feet of gain to a high point near 9,540 feet. It’s moderate overall but turns stout and rockier after The Pool as you climb past Fern Falls toward the lake.

Route highlights

From the Fern Lake Trailhead in Moraine Park, the path meanders along the Big Thompson River through mixed forest of aspens, pines, cottonwoods, and willows. At ~1.2 miles you squeeze by Arch Rocks—house-sized boulders that feel like a gateway. At ~1.7 miles, The Pool churns where Fern Creek meets the Big Thompson; it’s a natural rest spot and a junction with the Cub Lake Trail. From here the grade steepens for roughly 0.7–0.9 miles to Fern Falls, a beautiful ~60-foot cascade and another worthy turnaround if you’re short on time. Continue up-canyon toward Fern Lake for big views of Notchtop Mountain, Little Matterhorn, Knobtop, and The Gable; the best vistas often come from the east side of the lake after a short rise.

Logistics and parking

Start at the Fern Lake Trailhead at the end of the Moraine Park Campground Road. Parking is limited and often fills; arrive early. If you use the park shuttle, plan on an extra ~0.8-mile walk along the dirt road from the shuttle stop to the actual trailhead. Strong hikers sometimes run this as a point-to-point from Bear Lake over to Fern Lake and out to the Fern Lake Trailhead (about 9.5–10 miles), using the shuttle system when it’s operating.

Best time to hike

Late spring through fall offers the friendliest conditions. Wildflowers pop in early summer, but snow and ice can linger into that season—start early for cooler temps, better light on the waterfall, and easier parking. Midday in summer can feel hot on burn-scarred slopes with limited shade. In winter and spring, expect packed snow, ice, or deep drifts depending on recent storms; traction or snowshoes may be necessary. During peak season, timed-entry reservations apply in this corridor—plan ahead.

Seasonal and safety notes

Fire scars from the 2012 Fern Lake Fire and the 2020 East Troublesome Fire mean more sun exposure, occasional snag hazards, and sections of open slope—bring sun protection and don’t linger in wind when trees are creaking. Tread is rocky in places, especially above The Pool. Weather changes fast at these elevations; carry layers and plenty of water. Treat all creek and lake water. For anglers, small brook trout are the typical catch—know current regulations.

History

This route carries the imprint of early 1900s lodgekeepers and boosters who built and maintained it; it’s recognized on the National Register of Historic Places for its role in early park tourism. The Pool once hosted the Forest Inn, and Fern Lake had a lodge through the mid-20th century. A historic backcountry patrol cabin near here was lost in the 2020 fire.

Camping and add-ons

There’s one designated backcountry site near the north side of Fern Lake (near the Spruce Lake spur): no campfires, no privy—pack out human waste, and a permit is required. Bear-resistant canisters are required for overnights in season. If you have extra gas in the tank, Spruce Lake is ~0.8 miles farther on a rugged spur; continuing west leads toward Odessa Lake, a beautiful, quieter destination above Fern Lake.

Who will love it

Hikers who want a full-value day—river, waterfall, history, and a rewarding lake—without committing to a high-elevation alpine pass. If you prefer more immediate big-mountain drama, consider the Bear Lake–to–Fern Lake point-to-point; if you’re after a shorter sampler, turn around at Fern Falls.