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Flagstaff Trailhead

Flagstaff Trailhead



People enjoy open space for physical, emotional and mental health. Remember to always be courteous. Don't forget to: 

  • Plan visits ahead of time and don’t park illegally at full trailhead areas.
  • Remember to “keep the space in open space.” Maintain 6 feet of distance from people not in your household.
  • Leave No Trace. Stay on trail and walk through mud. If you step off trail to let others pass, immediately step back on trail. 
  • Protect first responders. Know your limits and don’t take unnecessary risks.
  • Visit to see current trail closures, historical data that shows areas of high and low open space use and trails that are wider than 6 feet. See when trails are busiest through our Visitation Data Explorer.


3.4 miles up Flagstaff Road, to Realization Point, then 0.5 miles on Flagstaff Summit Road. Please note: the vehicle length limit for Flagstaff Road is 30 feet.

Vehicular access May through Oct. 30 only.

Please check for Trail & Area Closures.

Or view the interactive trail map (includes trail closures) and the interactive wildlife closures map.

You are responsible for knowing and complying with all closures and OSMP rules & regulations.


Parking lots with a parking fee. Information on parking permits & fees.

Trailhead Safety 

Please keep your car doors locked and your car windows rolled up at all times while leaving your vehicle parked at OSMP trailheads. Also consider leaving important valuables at home or take them with you while visiting open space. To report suspicious activity please call City of Boulder Dispatch 303-441-3333 or Boulder County Dispatch 303-441-4444. For crimes in progress, call 911 immediately.


View Flagstaff Trail Map pdf

Flagstaff (moderate/strenuous) (1.5 mi; 1,120ft.) starts where Baseline Road turns into Flagstaff Road and the trail follows up to Panorama Point and up to Flagstaff Summit.

Boy Scout (easy/moderate) (0.8 mi; 140 ft.) begins and ends at the Sunrise Amphitheater and heads west through Douglas-fir forest, providing good views of Boulder Canyon. The trail gradually rises and falls to May's Point for an excellent view of  the Indian Peaks. Return back to parking lot at the west end of Flagstaff Summit via Boy Scout Trail.

Range View (0.6 mi; 170 ft.) provides excellent views of Indian Peaks as it follows the west side of Flagstaff Mountain. Keep a sharp lookout for birds of prey as the trail returns back to Realization Point.

Plains Overlook (0.2 mi; 60 ft.) a little loop trail that starts at the upper end of the Flagstaff Trail and leads to a clearing with a view of Boulder. A short branch of the trail goes northeast to the Sunrise Amphitheater.

Ute Trail (0.6 mi; 120 ft.) skirts the summit of Flagstaff Mountain (7,283 feet) and ends at a picnic area near the summit. Access to Flagstaff, Range View, and Boy Scout Trails.  This trail was named to honor the Ute Indians.

Flagstaff Nature Center

If you haven't paid a visit to the Flagstaff Nature Center, located on Flagstaff Summit, please stop by during the summer and fall months. It is open and staffed by volunteers from 10:30 a.m. to 4 p.m. on Saturdays and Sundays, Memorial Day weekend through Labor Day weekend.


This area is identified as being popular with people using wheelchairs. See the Accessible Trails Page for details.


Restrooms available at Flagstaff Summit.

Picnic Facilities 

Note: There is no potable water available at the Flagstaff Summit or Flagstaff Nature Center.

Picnic tables, grills, and trash cans located around Flagstaff Summit. Learn about reserving the picnic facilities and the Sunrise Amphitheater.

Bike Regulations 

Bicycles are allowed on Flagstaff Summit Road and Chapman Drive, but not on other trails in the area. Other bike trails on OSMP.

Dog Regulations 

Flagstaff Mountain Dog Regulations Map

Learn about bringing your dog to OSMP. All dogs must be leashed in the Trailhead Leash Area. Beyond the trailhead, dog control requirements vary from trail to trail, so carefully watch for dog regulation signs at trailheads and trail intersections. Dogs are prohibited on the Boy Scout Trail. On most other OSMP trails in this area, dogs must be on a hand-held leash at all times unless they meet the voice and sight control standard and display a City of Boulder Voice and Sight tag. Dog excrement removal is required by law. 

Horse Regulations 

Horses are allowed on most trails. On-trail riding is encouraged to protect rare plants and wildlife habitat. Learn more about riding your horse on OSMP.


Black bears and mountain lions inhabit this area. Many other wildlife species are common including songbirds, birds of prey, mule deer, red foxes, and coyotes.

Historic Info

The historic picnic structures and Sunrise Amphitheater were constructed by the Civilian Conservation Corps (CCC) in the 1930s, along with improvements to Flagstaff Road. Flagstaff Summit was the site of the KKK cross burning in 1924. A large wildfire burned across the summit of Flagstaff Mountain in October 1924, followed in the late 1920s by a large community effort led by Eben Fein to replant trees. Exactly 70 years later, almost to the day, Open Space and Mountain Parks conducted a 20 acre prescribed burn on the same site -- underscoring how our perception of forest fires has changed through the years.

Check out the self-guided Cultural Resources History Hike - Flagstaff Summit Adventure.