3.4
(18)
21
riders
01:47
18.6km
440m
Mountain biking
Embark on the Hall Ranch Loop for a challenging mountain biking experience near Lyons, Colorado. This difficult 11.6-mile (18.6 km) route takes you through diverse terrain, offering a rewarding ride with 1439 feet (439 metres) of elevation gain. You can expect to complete it in about 1 hour and 46 minutes. As you pedal, you'll traverse rolling grasslands and navigate past dramatic sandstone buttes, with the landscape shifting from red dirt to green trees. Keep an eye out for wildflowers and local wildlife along the way. From the high point, especially around the Nelson Loop, you'll get expansive 360-degree views, including the majestic Arapahoe Range and Longs Peak.
When planning your visit to Hall Ranch, be aware that it's a very popular spot, so you should anticipate crowds, particularly on weekends. The trailhead offers parking, but spaces tend to fill up quickly during peak hours, so arriving early is a good idea. It's important to note that dogs and e-bikes are not permitted on these trails. This regulation is in place to protect local wildlife and ensure a safe environment for all users.
This area is known for its vibrant natural environment, where the transition from rolling grasslands to rugged sandstone formations creates a unique ecosystem. The varied landscape supports a range of flora and fauna, making it a prime location for wildlife viewing. The trail's popularity stems from its accessibility and the quality of the mountain biking experience it offers, drawing riders looking for a substantial challenge in a scenic setting.
Last updated: April 23, 2026
Tips
Includes a very steep uphill segment
You may need to push your bike.
After 6.45 km for 294 m
Waypoints
Start point
Parking
Get Directions
62 m
Highlight • Parking
Tip by
9.44 km
Highlight (Segment) • MTB Park
Tip by
15.4 km
Highlight (Segment) • Trail
Tip by
18.6 km
End point
Parking
Way Types & Surfaces
Way Types
13.4 km
3.24 km
989 m
402 m
336 m
211 m
< 100 m
Surfaces
13.9 km
4.17 km
540 m
Sign up to see more specific route details
Sign up for free
Elevation
Highest point (2,030 m)
Lowest point (1,630 m)
Sign up to see more specific route details
Sign up for free
Weather
Powered by Foreca
Wednesday 6 May
4°C
-2°C
-- %
Additional weather tips
Max wind speed: -- km/h
to get more detailed weather forecasts along your route
This route was planned by komoot.
The Hall Ranch Loop offers a diverse experience. While the overall difficulty is rated as difficult, sections like the Nelson Loop and the Antelope Trail can be more approachable for intermediate riders. The Lower Bitterbrush Trail, however, is known for its ultra-difficult, rock-garden-laden technical sections, making it challenging even for experts. Beginners might find many parts of the loop too demanding.
The terrain varies significantly. You'll encounter everything from smooth, flowing singletrack on parts of the Nelson Loop to highly technical rock gardens on the Lower Bitterbrush Trail. Expect mixed granite and dirt tread, switchbacks, steep climbs, and fast, flowing descents with occasional rocky sections. The landscape transitions from rolling grasslands to sandstone buttes.
Parking is available at the Hall Ranch Trailhead. Due to the trail's popularity, especially on weekends, the parking lot can fill up quickly. Arriving early is highly recommended to secure a spot.
No, dogs are not permitted on the trails within Hall Ranch Open Space. This regulation is in place primarily due to wildlife concerns.
As of current information, there are no specific permits or entrance fees required to access Hall Ranch Open Space for day use. However, it's always a good idea to check the Boulder County Parks & Open Space website (bouldercounty.gov) for the most up-to-date regulations before your visit.
The trail is generally accessible for much of the year, but spring and fall offer ideal conditions with pleasant temperatures and vibrant scenery. Summer can be hot, and afternoon thunderstorms are common. Winter riding is possible but depends on snow accumulation and trail conditions.
You'll be treated to spectacular scenery, including rolling grasslands, dramatic sandstone buttes, and excellent viewing opportunities for wildflowers. From the Nelson Loop, you'll get beautiful 360-degree vistas, including views of the Arapahoe Range and Longs Peak. The red dirt and green trees create a vivid landscape, and you'll see dramatic tilted rock formations where the Great Plains meet the Southern Rocky Mountains.
Yes, the Nelson Loop passes by the remnants of the historic Nelson Ranch, including an old homestead and grain silo, offering a glimpse into the area's past. The Lower Bitterbrush Trail itself is a notable feature, famous for its challenging technical sections.
While the Nelson Loop can be ridden in either direction, riding it clockwise is often recommended. This direction provides better flow on the downhill sections, enhancing the overall riding experience.
Intermediate riders looking for a less technical climb can start on the Antelope Trail. For those seeking a significant challenge, the Lower Bitterbrush Trail offers ultra-difficult, rock-garden-laden sections that will test expert mountain bikers. The Upper Bitterbrush Trail provides gentler grades for climbing and a fast, flowing descent.
Hall Ranch is home to various wildlife. While enjoying the natural beauty, riders should be aware of potential encounters with animals, including rattlesnakes. Always stay alert and give wildlife plenty of space.