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William Frederick Hayden Park

National Trails Day Hikers at Hayden Green Mountain William Hayden Green Mountain
1000 S. Rooney Rd.
(Multiple access points on Alameda Pkwy. and Rooney Rd.)
Lakewood, CO 80228
Daily 5 a.m. - 10 p.m.
Stage 1: Fire Restrictions -- NOW IN EFFECT for Bear Creek Lake Park, William Frederick Hayden Park on Green Mountain, and Thunder Valley! Learn more about fire restrictions, and what is/isn't allowed at


With more than 2,400 acres of open space, William Frederick Hayden Park on Green Mountain is the second largest park in Lakewood. The park features a challenging network of multi-use trails. The summit, at 6,800 feet, offers unique and stunning views of the Denver metropolitan area to the east, as well as high mountain peaks to the west.


Since 1972, the majority of William Frederick Hayden Park was donated by, or purchased from, the Hayden Family. Once home to the buffalo, this park now provides rich habitat for a diverse array of wildlife, including coyotes, hawks, rattlesnakes, bluebirds, rabbit, mule deer and an occasional mountain lion.


The north side of Hayden Park on Green Mountain was used as an artillery target range for the nearby Camp George West, the Colorado National Guard’s training facility during the first half of the 20th century. As such, the possibility of old military munitions and debris exists in the park. Park visitors should stay on marked trails as the park rules require. The U.S. Army Corps. of Engineers, the Colorado Department of Public Health and Environment and the Colorado Army National Guard are working to investigate the presence of old munitions to determine ways to clean up the area. For more information, please visit


Munitions update
If you see crews using shovels and hand tools to dig on the north slopes of William Hayden Park on Green Mountain, please don’t be alarmed. Crews are investigating the extent and potential hazards of any munitions debris left more than 70 years ago, and they might also have to destroy items by detonating them in the park. Trails may be temporarily closed during detonations. If detonations occur, they will involve a short boom and a small puff of smoke. If park visitors encounter the crews, they should follow the directions the crews give. The work is expected to continue for several more weeks. The Army National Guard is investigating 641 acres on the north side of the park, which was used as an impact area for an artillery range during military training activities from 1930 to 1945 at Camp George West in Golden.



  • Hiking Trails
  • Restrooms
  • Parking Lot


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Why does my dog have to be on leash at William F. Hayden Park on Green Mountain?
What potentially hazardous animals are on William F. Hayden Park on Green Mountain?
What does the volunteer bike patrol do?
I see cars driving on William F. Hayden Park on Green Mountain, who are they?
Why are you closing the trails on William F. Hayden Park on Green Mountain?
What are you doing to prevent car break-ins at the parking lot?
Why can’t I walk off trail in the park?
Who do I call if I have a complaint, question, concern or problem on William F. Hayden Park on Green Mountain?


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