Quick Info
Size: 15,000 acres. Wildlife: Bison, deer, eagles, prairie dogs. Activities: Wildlife viewing, hiking, biking, fishing. Visitor center: Yes, with exhibits. Fee: Free. Best for: Wildlife watching, nature escape near Denver.
Rocky Mountain Arsenal is one of the largest urban wildlife refuges in the country—15,000 acres of prairie, wetlands, and woodlands just 10 miles from downtown Denver. The former military site has been transformed into a thriving wildlife habitat home to bison, deer, eagles, and hundreds of other species.
Wildlife
Bison
A herd of bison roams the refuge. Best viewed from the wildlife drive or observation areas.
Deer & Elk
Mule deer and white-tailed deer common throughout. Elk occasionally spotted.
Bald Eagles
Bald eagles nest at the refuge. Best viewing during winter months.
Prairie Dogs
Large prairie dog towns throughout the refuge. Easy to observe from trails and roads.
Activities
Wildlife Drive
11-mile auto tour loop through the refuge. Excellent for wildlife spotting from your vehicle.
Hiking
Multiple trails ranging from short walks to longer hikes. Flat terrain suitable for most fitness levels.
Biking
Bikes allowed on designated trails. Paved and gravel surfaces available.
Fishing
Lake Mary provides fishing opportunities. State license required.
Visitor Center
Exhibits
Interpretive exhibits about wildlife, history, and the site's transformation from military to refuge.
Programs
Ranger-led programs, wildlife tours, and educational events. Check schedule.
Tips
Early morning best. Wildlife most active at dawn. Arrive early for best sightings.
Bring binoculars. Essential for wildlife viewing. Animals may be distant.
Stay in vehicle on wildlife drive. Best for your safety and wildlife comfort.
Check hours. Refuge hours vary seasonally. Visitor center has limited hours.
Frequently Asked Questions
Is Rocky Mountain Arsenal free?
Yes—no entrance fee. Free wildlife refuge managed by US Fish & Wildlife Service.
Will I see bison?
Likely—bison are often visible from the wildlife drive, though locations vary.
Is it safe?
Yes—former contamination has been remediated. The site is safe for visitors.
How far from Denver?
About 10 miles northeast of downtown Denver. 15-20 minutes by car.