Fern Lake

Overview

Fern Lake is a moderate, scenic out-and-back that strings together river, rapids, a standout waterfall, and a subalpine lake framed by rugged peaks. From the Fern Lake Trailhead, it’s roughly 7.6 miles round trip with about 1,400–1,500 feet of gain, topping out near 9,500 feet. Expect a gentle start along the Big Thompson River, then a steeper, rockier finish after The Pool as you climb toward Fern Falls and the lake. Plan on about 4 hours from the trailhead, more if you linger or start from the shuttle stop.

Route Highlights

• Arch Rocks (~1.2–1.5 mi): house-sized boulders the trail threads through—your first big landmark.
• The Pool (~1.7 mi): a footbridge at the confluence of Fern and Spruce Creeks with the Big Thompson—scenic, popular, and a nice early turnaround for families.
• Fern Falls (~3.5 mi): a 60-foot curtain of water that steals the show, especially after rain or snowmelt.
• Fern Lake (~3.8 mi one way): wander the north shore for classic views of Notchtop Mountain, Little Matterhorn, Knobtop, and The Gable. On calm days, reflections can be superb.

You’ll follow the river’s soundscape for much of the approach, then grind through a steeper, rockier grade to the lake. Portions of the upper trail pass through burn-scarred terrain from recent wildfires, which means bigger views—but also more sun exposure.

What to Expect

• Difficulty: Moderate overall; the section after The Pool is the crux—rockier and steeper.
• Footing: Mostly dirt with rocks/roots; expect uneven tread and some switchbacks. Parts of the trail may see horse traffic.
• Wildlife: Elk and moose are common, and hikers report deer, ducks, and occasional bear sightings. Give wildlife space.
• Shade/Exposure: Limited shade in burn areas—bring sun protection.

Logistics and Access

Parking at the Fern Lake Trailhead is very limited, and roadside parking is prohibited. Many hikers use the Park & Ride shuttle; if you’re dropped at the Fern Lake bus stop, it adds about 0.8 mile one way just to reach the actual trailhead. In peak season, the park uses timed-entry reservations; choose the option that includes the Bear Lake Road Corridor to access this trail. Start early to beat crowds, nab parking, and enjoy cooler temps.

There are no services at the lake. Don’t count on toilets along the way—pack a WAG bag and know how to use it. Treat or boil any water you collect. No campfires are allowed at backcountry sites. If you’re backpacking, bear-resistant canisters are required from spring through fall.

Seasonal Notes

Spring and early summer can hold snow and ice; traction (microspikes) or snowshoes may be necessary. Summer brings heat and afternoon storms—start early and be back below treeline if thunderheads build. Fall colors and crisp air can be fantastic. Winter travel here requires appropriate gear and experience.

Variations and Comparables

• Push beyond Fern to Odessa Lake (+~2 miles round trip and additional gain) on rougher, steeper trail—rewarding scenery and quieter shores.
• For a bigger day, link Fern Lake with the Cub Lake side for a varied loop (meadows, burn regrowth, elk habitat)—longer and a step up in effort.

If you’re torn between lake hikes in the area: this one’s a classic mix of river walking, waterfalls, and big mountain backdrops without committing to an all-day sufferfest. If you crave even more drama, add Odessa.

Best Time to Hike

Early mornings on fair-weather days from late spring through fall are ideal—cool temps, softer light on Fern Falls, and fewer people at The Pool and the lake. Weekdays see lighter traffic than weekends. In winter and shoulder seasons, start later in the morning to let ice soften and bring proper traction.