The park land was formerly part of the historical 'Lair of the Bear' private retreat owned by the O'Fallon family.
Bear Creek, which runs through the park, is a managed trout fishery regulated by Colorado Parks and Wildlife.
The park provides critical habitat for black bears, mountain lions, and mule deer, requiring hikers to follow wildlife safety protocols.
The park's namesake structure, a stone ruin, was part of a summer home complex built in the early 20th century.
The park connects to a wider regional trail system that allows for continuous hiking from Idledale toward Evergreen.
Lair o’ the Bear Park is a 396-acre Jefferson County Open Space area centered around the Bear Creek canyon. The park is defined by a 1.3-mile section of the Bear Creek Trail that provides access to the water's edge. Distinctive geological features include massive granitic rock outcroppings typical of the Front Range foothills. Vegetation in the area transitions from riparian cottonwoods along the creek to ponderosa pine and Douglas fir forests on higher slopes. The park serves as a hub for both hikers and anglers looking to access Bear Creek for trout fishing. A stone castle ruin, known as the 'Castle' structure, remains visible near the creek as a remnant of the property's previous private ownership. The trail network connects directly to the broader Corwina and O'Fallon parks to the west.
The stone bridge crossing Bear Creek, which offers a clear view of the water and the forested canyon walls.
Arrive early on weekends, as the parking lot frequently reaches capacity by mid-morning.
Wear footwear with good traction, as the trails contain loose rock and sections with steep elevation changes.
Bring a water filter or sufficient supply, as potable water is not available on the trails.
Do not attempt to park along the shoulder of CO-74 if the lot is full, as this leads to immediate towing and fines.
Open daily from sunrise to sunset, though trail access may be limited during winter months due to icy conditions.
Leash your dogs at all times to protect local wildlife; pack out all trash, including pet waste.
