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Routes
MTB trails
United States
Colorado
Adams County

Thornton

The best MTB trails around Thornton

4.3

(12)

227

riders

23

rides

Mountain bike trails around Thornton, Colorado, traverse an extensive network of pathways across the city's open spaces and natural areas. The terrain is characterized by generally flat to gently rolling landscapes, offering accessible riding experiences. Riders can expect views of the Rocky Mountain foothills and encounters with natural water features like lakes and streams. The region's commitment to trail development provides numerous opportunities for outdoor recreation.

Best mountain bike trails around Thornton

  • The most popular mountain bike trail is Rocky Mountain Arsenal National Wildlife Refuge Perimeter Trail, a 20.9 miles (33.6 km) moderate trail that takes 2 hours 35 minutes to complete. This route offers expansive views within a wildlife refuge setting.
  • Another top favourite among local mountain bikers is Mountainbike loop from Erie, a moderate 2.0 miles (3.3 km) path. This shorter loop provides a quick ride through local landscapes.
  • Local mountain bikers also love the Greenbelt Plateau – Community Ditch Trail loop from Holy Family High School, a 44.5 miles (71.7 km) trail leading through greenbelt areas, often completed in about 5 hours 14 minutes.
  • Mountain biking around Thornton is defined by extensive open spaces, gently rolling terrain, and views of the Rocky Mountain foothills. The network offers options for various ability levels, from easy rides to more challenging long-distance routes.
  • The routes in Thornton are highly rated by the komoot community with an average score of 4.6 stars from over 12 reviews. More than 240 mountain bikers have used komoot to explore Thornton's varied terrain.

Last updated: April 30, 2026

29

riders

#1.

Coal Creek and Erie Singletrack Loop

9.39km

00:45

90m

90m

Experience the difficult 5.8-mile Coal Creek and Erie Singletrack Loop, combining creekside paths with technical mountain biking features.

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Hard

Explore the Rocky Mountain Arsenal National Wildlife Refuge Perimeter Trail, a 20.9-mile mountain biking loop with wildlife and mountain vie

Moderate
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Hard mountain bike ride. Great for any fitness level. Advanced riding skills necessary. Some portions of the route may require you to push your bike.

Hard

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate

Moderate mountain bike ride. Great for any fitness level. Advanced riding skills necessary.

Moderate
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Popular around Thornton

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Tips from the Community

AverieOutside
June 29, 2025, Adler-Fingru Open Space

Adler-Fingru Open Space is a 55.7-acre area that was once used for crop production and livestock grazing. Ownership of the space is divided three ways among the cities of Boulder, Louisville, and Lafayette. This property is under an agricultural lease, so access to the public is limited to only the Coal Creek Trail that passes through the space.

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Warembourg Open Space is a peaceful spot along Coal Creek and the Coal Creek Regional Trail, shaped through conservation efforts by Boulder County, Louisville, and Lafayette. Established in 1999 and 2003, it offers hikers a lovely riparian habitat with cottonwoods, wildlife, and scenic creekside views—a perfect place for an easy, immersive walk close to nature.

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Zachary
June 24, 2025, Lake Link Trail

This packed dirt multi-use trail runs for nearly nine miles, from Lac Amora Open Space to McKay Lake. It links many small lakes, ponds, and streams in Broomfield, and is a great connector for other trails.

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Alex
May 15, 2025, Rock Creek Trail

Rock Creek Trail stretches 12 miles from Majestic Drive in Lafayette to Coalton Road and McCaslin Boulevard in Superior. The surface consists of crushed gravel, and the entire length is car-free.

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Great path, beautiful views.

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The Perimeter Trail is the longest trail in Rocky Mountain Arsenal National Wildlife Refuge. It runs 14 miles in one direction around the edge of the park. It is a great spot to get in some easy mountain biking close to the heart of Denver; it is a mostly flat, non-technical, wide gravel trail. As you ride, be on the lookout for wildlife and other users.

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From this vantage point, you'll be treated to a stunning view where the prairie meets the woodlands. The area showcases a diverse array of wildlife, from prairie dogs and bison in the meadows to eagles soaring through the air.

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The Rocky Mountain Greenway Trail, or Greenway Trail, is one of the main trails on the southern side of the Rocky Mountain Arsenal National Wildlife Refuge. It helps connect different trails to each other, but unlike some of the other trails, this one is open for bikes. Although it can be a little dry and loose, overall this is very easy, well-graded, gravel trail. Another nice feature of this trail is that dogs are not allowed.

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Frequently Asked Questions

How many mountain bike trails are available in Thornton?

Thornton offers a comprehensive network of mountain bike trails. On komoot, you'll find over 25 routes, with 9 categorized as easy, 13 as moderate, and 3 as difficult, catering to a wide range of skill levels.

What kind of terrain can I expect on mountain bike trails in Thornton?

The terrain in Thornton is generally characterized by flat to gently rolling landscapes, making it accessible for various riders. While highly technical trails are less common directly within the city, the extensive network provides pleasant rides through natural settings and open spaces, often with views of the Rocky Mountain foothills.

Are there any easy mountain bike trails suitable for beginners or families?

Yes, Thornton has several easy trails perfect for beginners or family outings. For example, the Warembourg Open Space loop from Holy Family High School is an easy 17.0-mile route. The region's focus on maintaining accessible trails like the Farmers Highline Canal Trail and Signal Ditch Trail also ensures a comfortable riding experience.

What are some scenic viewpoints or natural features I can see while mountain biking in Thornton?

Many trails in Thornton offer expansive views of the Rocky Mountain foothills. You can also encounter natural water features like lakes and streams. For instance, the Standley Lake area provides scenic views, and the Lowell Ponds Wildlife Area offers a peaceful setting with water access.

Are there any mountain bike trails that are dog-friendly in Thornton?

Thornton's extensive open spaces and multi-use trails often accommodate dogs, provided they are kept on a leash. While specific dog-friendly mountain bike trails aren't explicitly listed, many of the city's parks and open spaces, such as those connected by the Big Dry Creek Trail, are popular for walks and rides with canine companions. Always check local signage for specific regulations.

What do other mountain bikers say about the trails in Thornton?

The mountain bike trails in Thornton are highly regarded by the komoot community, with an average rating of 4.6 stars from over 12 reviews. Riders often praise the extensive open spaces, the generally easy to moderate terrain, and the scenic views of the Rocky Mountain foothills that make for enjoyable rides.

Are there any longer mountain bike routes for experienced riders?

Yes, for more experienced riders looking for a longer challenge, the Greenbelt Plateau – Community Ditch Trail loop from Holy Family High School is a difficult 44.5-mile route that takes approximately 5 hours and 14 minutes to complete. This trail leads through extensive greenbelt areas.

What are some places to explore near the mountain bike trails in Thornton?

Beyond the trails, Thornton offers several natural attractions. You can visit Standley Lake for its scenic beauty, or explore the Lowell Ponds Wildlife Area. The Big Dry Creek Trail itself is a highlight, connecting to other significant pathways and open spaces.

Are there any circular mountain bike routes in Thornton?

Yes, many of Thornton's trails are designed as loops or can be combined to form circular routes. For example, the Mountainbike loop from Erie is a moderate 2.0-mile circular path, and the Standley Lake – Standley Lake loop from Farmers High Line Canal Open Space offers a longer 16.9-mile loop experience.

What is the best time of year to go mountain biking in Thornton?

The generally mild climate of Thornton makes mountain biking enjoyable for much of the year. Spring and fall offer pleasant temperatures and vibrant scenery. Summer is also popular, though it's advisable to ride earlier in the day to avoid the midday heat. Winter riding is possible on many trails, but conditions can vary with snow and ice, so checking local weather is recommended.

Where can I find information about parks and open spaces in Thornton?

Thornton is dedicated to its parks and open spaces, managing over 2,500 acres. For more detailed information on the city's commitment to these areas and their development, you can visit the official Thornton Parks and Recreation website: thorntonco.gov/parks-recreation/parks-planning/open-space.

Is there a mountain bike trail that offers a wildlife refuge experience?

Absolutely. The Rocky Mountain Arsenal National Wildlife Refuge Perimeter Trail is a moderate 20.9-mile route that offers expansive views within a dedicated wildlife refuge setting, providing a unique opportunity to observe local fauna while riding.

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