Bear Peak at a glance: Boulder's most rewarding strenuous hike. 5.5 miles round trip via Fern Canyon, 2,600 feet elevation gain. Summit at 8,459 feet offers 360-degree views from Denver to Rocky Mountain National Park. Plan 4-6 hours. Start early—afternoon thunderstorms are dangerous. Dogs allowed on leash.
Trail Overview
Distance: 5.5 miles round trip (Fern Canyon route)
Elevation gain: 2,600 feet
Summit elevation: 8,459 feet
Difficulty: Strenuous
Time: 4-6 hours
Trailhead: NCAR (National Center for Atmospheric Research)
Bear Peak is the highest point in Boulder's mountain backdrop, rising prominently south of the Flatirons. The trail delivers a genuine mountain summit experience within city limits. The views from the top—Denver's skyline, the Continental Divide, Rocky Mountain National Park—make the steep climb worthwhile.
Routes to Summit
Fern Canyon Trail (Recommended)
Distance: 5.5 miles RT | Gain: 2,600 feet
The most direct route from NCAR. Starts on Mesa Trail, then climbs steeply through Fern Canyon. The upper section involves some scrambling on rocky terrain. Well-marked but demanding. Most popular route.
Bear Canyon Trail
Distance: 8 miles RT | Gain: 2,700 feet
Longer but more gradual approach. Follows Bear Canyon before joining the summit trail. Good option if Fern Canyon feels too steep. More shade through the canyon section.
South Mesa to Shadow Canyon
Distance: 7 miles RT | Gain: 2,500 feet
Starts from South Mesa Trailhead. Shadow Canyon offers a dramatic approach through a narrow canyon. Technical scrambling near the top. Less crowded.
Trail Conditions
The lower sections are well-maintained dirt trail. Upper sections become rocky with some Class 2 scrambling (use hands for balance). The final push to the summit requires picking your way through boulders. Trekking poles help on the descent.
Snow lingers on north-facing slopes into May. After snowmelt, the trail is hikeable through October. Summer brings afternoon thunderstorms—be off the summit by noon.
Tips for Success
Start early: On the trail by 6-7am in summer. Lightning on the exposed summit is life-threatening.
Bring plenty of water: Minimum 2 liters. No water sources on the trail. More on hot days.
Layers: Summit is 15-20°F cooler and often windy. Bring a windbreaker even in summer.
Traction: Microspikes recommended in spring when ice remains on shaded sections.
Parking: NCAR lot fills early on weekends. Arrive by 7am or take the bus (Route 204).
Trailhead Info
NCAR Trailhead: 1850 Table Mesa Dr, Boulder. Free parking. Restrooms at the NCAR building. Drinking fountain. The building itself has interesting science exhibits if you arrive before it opens.
Frequently Asked Questions
Is Bear Peak harder than Green Mountain?
Yes. Bear Peak has more elevation gain (2,600 vs 2,000 feet) and involves scrambling near the summit. Green Mountain is strenuous; Bear Peak is very strenuous.
Can beginners hike Bear Peak?
Not recommended. This is a challenging hike for fit, experienced hikers. Start with Sanitas, Chautauqua trails, or Green Mountain to build fitness.
Are dogs allowed?
Yes, on leash. Bring extra water for your dog and be aware of the scrambling sections.