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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.

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 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


Investigations of munitions debris continues
Beginning in late September, field workers will be visible in the Green Mountain Estates neighborhood in Lakewood and Mesa View Estates neighborhood in unincorporated Jefferson County to conduct investigations related to the former Camp George West Artillery Range impact zone on the northern slopes of Green Mountain. Prior notice and communication with property owners is occurring, but others that are not directly involved could see the work going on in the neighborhoods. The investigation has expanded into the neighborhoods because munitions and munitions related debris dating from prior to World War II have been found in the vicinity of the neighborhoods. Although finding munitions-related material in these neighborhoods is unlikely, caution and public safety require a thorough investigation. Details and site visit results will be posted here and in other sources throughout the investigation period. The neighborhood visits are expected to begin in the later part of September and to be completed before the middle of November.

For additional information or contacts, please visit



  • 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?
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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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