Bear Lake & Fern Falls Trail Run Loop — Rocky Mountain National Park

The most common starting point for this route is the Bear Lake Trailhead in Rocky Mountain National Park. Parking at Bear Lake can be very challenging, especially during peak season. It's highly recommended to utilize the free Rocky Mountain National Park shuttle system, which services the Bear Lake Road corridor. You can park at the Park & Ride lot and take a shuttle to the trailhead.

Yes, it's generally recommended to jog this route starting from Bear Lake and heading towards Fern Lake. This direction minimizes the overall elevation gain, making the long descent more runnable and enjoyable for joggers. Be prepared for significant uphill climbs in the initial sections regardless.

Yes, this trail is located within Rocky Mountain National Park, so you will need to pay the park entrance fee. Additionally, during peak season (typically late May through October), a timed entry permit may be required to access the Bear Lake Road corridor where this trailhead is located. Check the official RMNP website for the most current permit requirements and reservation details.

The terrain is varied and challenging. You'll encounter rugged and rocky sections, significant elevation changes, and switchbacks, particularly when ascending past Fern Falls. The path alternates between dense pine forests and open spaces. Even in summer, snow patches can be present at higher elevations, which can reach over 10,000 feet.

This route is renowned for its stunning scenery. You'll pass a chain of beautiful alpine lakes including Bear Lake, Two Rivers Lake, Lake Helene, Odessa Lake, and Fern Lake. Highlights also include the 60-foot Fern Falls and "The Pool" with its whirling cascades. Expect expansive mountain views of peaks like Longs Peak, Notchtop Mountain, and Chiefs Head Peak.

This trail is considered difficult for jogging. While it's often rated intermediate for hiking, the distance, significant elevation gain (over 900 meters), and varied terrain make it a challenging and rewarding experience for runners. Be prepared for sustained climbs and rugged descents.

The best time to jog this route is typically from late spring through early fall (June to September) when the snow has largely melted and wildflowers are in bloom. However, even in summer, snow patches can persist at higher elevations. Be aware that afternoon thunderstorms are common in the summer, so an early start is advisable. Winter conditions require specialized gear like microspikes or snowshoes.

The trail reaches elevations exceeding 10,000 feet in many places. This high altitude can pose a risk of altitude sickness, especially for those not acclimated. Symptoms can include headaches, nausea, and dizziness. Stay hydrated, take it slow, and be aware of your body's signals. The high altitude also contributes to sudden weather changes, so be prepared for cooler temperatures and potential storms.

No, dogs are generally not allowed on hiking or jogging trails in Rocky Mountain National Park, including this route. Pets are only permitted on paved roads, in campgrounds, and in picnic areas. Service animals are an exception to this rule.

Given the trail's difficulty, length, and high altitude, pack essentials like plenty of water, high-energy snacks, sun protection (hat, sunscreen, sunglasses), and layered clothing suitable for changing weather conditions (even in summer). A rain jacket is highly recommended. Navigation tools (map, GPS) are also wise, along with a first-aid kit. Consider trekking poles for stability on rocky sections.

Yes, this extensive route utilizes sections of several well-known paths within Rocky Mountain National Park. You will be jogging along parts of the Fern Lake Trail, Flat Top Mountain Trail, Bear Lake Trail, and Emerald Lake Trail as you navigate this loop.