Gregory Canyon Trailhead
Boulder Star area on Flagstaff Mountain is closed
The Boulder Star area on Flagstaff Mountain IS CLOSED to prevent gatherings amid the COVID-19 pandemic and because of ecological and safety concerns in the area. Visitors entering the Boulder Star closure area on Flagstaff Mountain can face up to a $1,000 fine or 90 days in jail. Learn more. Follow these other important recreation guidelines:
- Stay home if you are sick or exhibiting COVID-19 symptoms.
- Only recreate with members of your own household.
- Always bring a face covering. Wear it when you can’t maintain 6 feet of physical distance.
- Keep the space in open space! Always stay at least 6 feet from non-household visitors.
- Visit OSMPTrails.org 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.
- Protect first responders. Know your limits and don’t take unnecessary risks.
Turn south from Baseline Road onto Gregory Canyon Trailhead access road. The turnoff is west of the Chautauqua Meadow and east of where Baseline Road becomes Flagstaff Mountain Road and goes up Flagstaff Mountain.
Please check for Trail & Area Closures.
You are responsible for knowing and complying with all closures and OSMP rules & regulations.
Parking lot at trailhead and parking fee.
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.
Gregory Canyon (1.1 mi; 900 ft.) goes west past the junction of the Saddle Rock Trail, crosses a ridge with spectacular outcrops and views. It then climbs to a saddle and drops into a drainage to end at a dirt road leading up to Realization Point.
Saddle Rock (1.3 mi; 1,400 ft.) branches south off the Gregory Canyon Trail, crosses a bridge and climbs to the junction of the upper end of Amphitheater Trail. Climbs steeply to Saddle Rock, a spectacular overlook worth a detour. The trail continues past Saddle Rock to end at E.M. Greenman Trail.
Post-flood Update - Saddle Rock Trail now has a ladder: OSMP crews had to rebuild the trail in locations where floodwater removed large sections of earth. Department crews also installed a ladder in a steep, flood-damaged section of trail. Visitors need to exercise caution while on the ladder. OSMP also advises that visitors should not allow their dogs to attempt to negotiate the ladder.
Bluebell-Baird (0.7 mi; 340 ft.) branches southeast off the Amphitheater Trail and climbs a ridge, then follows the ridge south past the Chautauqua and Bluebell Mesa Trails to end at the Bluebell Road just behind the Bluebell Shelter.
Amphitheater (0.4 mi; 540 ft.) crosses a bridge and goes up a draw past the junction with Bluebell-Baird Trail. It then follows a draw steeply up past Gregory Amphitheater, a little bay in the rocks where you often see rock climbers. The trail ends at Saddle Rock Trail.
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.
Crown Rock (0.5 mi; 400 ft.) starts from the Gregory Canyon Trail and goes north to join Flagstaff Road at the Crown Rocks bouldering area.
Restroom facilities at trailhead.
Bicycles are not allowed on trails in this area.
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. On most 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.
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 birds of prey, mule deer and coyotes. White-tailed and mule deer are common. Red-tailed hawks, foxes and coyotes are sometimes seen.