Hall Ranch

Hall Ranch at a glance

Hall Ranch is a 3,899-acre Boulder County open space where the sweeping grasslands of the Great Plains rise to meet the southern Rocky Mountains. It's a classic foothills mix of cliffs, canyons, hills, and meadows, and it's best known to riders as the home of the Bitterbrush Trail, a rocky, technical climb that's a rite of passage on the Front Range. Hikers and trail runners get the same big country with fewer wheels once you're off the main climb.

The Bitterbrush Trail and mountain biking

The Bitterbrush Trail runs 3.7 miles and is rated Difficult, and that rating is honest: it climbs over ledgy, rocky ground that rewards good line choice and punishes tired legs. Bikes are allowed on designated trails only, and Bitterbrush is the one that made Hall Ranch a mountain-biking name. The signature outing climbs Bitterbrush to the Nelson Loop at the top and comes back down. Nighthawk Trail, by contrast, is closed to bikes, and e-bikes are prohibited everywhere on the property, so check the trail signs before you ride.

Hiking the trails

On foot, Boulder County lists five trails: Bitterbrush (3.7 miles, Difficult), Nighthawk (4.7 miles, Moderate/Difficult), the Nelson Loop (2.2 miles, Moderate/Difficult), Antelope Trail (1.0 mile, Moderate), and Button Rock Trail (2.0 miles, Moderate). The upper country opens onto views of Hat Rock and Indian Lookout Mountain, where tilted red rock marks the seam between the plains and the mountains. Hikers who want a quieter line than the busy Bitterbrush can start from the Antelope side.

Dogs are not allowed

This is the rule that catches people off guard: Hall Ranch does not allow dogs at all. It's a no-pets property, and Boulder County prohibits dogs on every trail, leashed or not, to protect the wildlife that depends on this habitat. There's no dog section and no exception, so if you're traveling with a dog, plan to visit a dog-friendly open space instead and save Hall Ranch for a day without the pup.

Rattlesnakes and wildlife

Boulder County lists the prairie rattlesnake among the animals at Hall Ranch, so watch where you step and where you put your hands on warm days, especially on the sunny, rocky stretches of Bitterbrush. Black bears and mountain lions also use the property. Giving wildlife room is part of why the no-dogs rule exists here in the first place.

Getting there and parking

The main Hall Ranch Trailhead is off Colorado Highway 7 just west of Lyons. It's the big one, with 64 car spots across two lots, ADA parking, a restroom near the trailhead, and picnic tables by the lots. The second access, the Antelope Trailhead, is much smaller at 8 spots. The main lot fills on nice weekends, so come early. It's day-use only, open sunrise to sunset, and there's no entrance or parking fee.

Best season and time to go

These are lower, exposed foothills with little shade, so spring and fall are the comfortable windows. Summer middays get hot and open, and warm weather is also when rattlesnakes are most active. Note that the Nelson Loop area can close for a prescribed burn in the winter-to-spring window, so check Boulder County's page for current closures before you drive out.

Nearby trails and guides

• Biking in Boulder: the full biking hub, from mellow paths to technical singletrack.
• Betasso Preserve: another Boulder County favorite for mountain bikers, with its own rules on bike days.
• All hikes in Boulder: the full hiking hub, sorted by difficulty.

Recommended nearby

A few local spots in Lyons we'd point a Hall Ranch day toward.

Hall Ranch FAQ

Sources

Facts on this page are drawn from these authoritative sources:

• Boulder County Parks & Open Space: Hall Ranch
• Boulder County Parks & Open Space: Rules and Regulations