Lost Lake via North Fork Trail

This challenging out-and-back hike typically takes around 8 hours and 51 minutes to complete. However, your individual pace, the number of stops you make, and current trail conditions can all affect the total duration.

The trail begins with a brief downhill section before a significant climb. You'll follow the North Fork Big Thompson River, traversing forested areas and open alpine meadows. Expect footbridges, some unbridged river crossings (often with stepping stones), and a final push to Lost Lake that involves scrambling over boulders. Snow can persist in the upper reaches, even into mid-June.

No, dogs are generally not permitted on this trail once it enters Rocky Mountain National Park. RMNP has strict regulations regarding pets on trails to protect wildlife and natural resources. Please check the official RMNP website for the most current pet policies before your visit.

Yes, as this trail enters Rocky Mountain National Park, you will need to pay the park's entrance fee. Additionally, if you plan to camp overnight, permits are required for backcountry campsites within the National Park boundary, such as Lost Falls campground or Boundary Creek. It's advisable to check the RMNP website for current entrance fees and permit reservation requirements, especially during peak seasons.

The best time to hike this trail is typically from late June through early October, once most of the snow has melted from the higher elevations. Mid-June can still see significant snow cover in the upper reaches. Always check current trail conditions and weather forecasts before heading out.

This trail offers diverse scenery and points of interest. You'll pass the Start of North Fork Trail, historical homestead ruins, and lush forests. Highlights include Kettle Tarn Lake and Campsites, the impressive Lost Falls, and the stunning alpine destination of Lost Lake, nestled below 12,000-foot peaks.

The trail begins at the North Fork Trailhead, located in the Roosevelt National Forest. Parking is available at the trailhead. Given the trail's popularity and length, arriving early is recommended, especially during peak season, to secure a parking spot.

Yes, this trail is suitable for multi-day trips. There are Forest Service campsites located 2.3 to 3 miles from the trailhead. Further along, within Rocky Mountain National Park, permit-required backcountry campsites like Lost Falls campground and Boundary Creek are available. Reservations for RMNP campsites are essential.

Yes, the route primarily follows the North Fork Trail for significant sections. It also briefly intersects with the Stormy Peaks Trail, North Fox Trail, Bulwark Ridge Trail, and North Boundary Trail.

Given its length of nearly 30 kilometers (19.5 miles) and over 1000 meters (3,280 feet) of elevation gain, this trail is rated as difficult. It involves challenging terrain, including boulder scrambling and potential snowfields. Therefore, it is generally not recommended for beginners or families with young children. Hikers should have a good level of fitness and experience.

As the trail traverses diverse ecosystems, including wilderness areas and Rocky Mountain National Park, there are opportunities for wildlife sightings. While not guaranteed, you might spot various bird species, deer, elk, and smaller mammals. Always maintain a safe distance and never feed wildlife.