Thornton Mountain Biking Trails and Maps

202 Reviews

Looking for the best Mountain Biking trails around Thornton?

Find the top rated mountain biking trails in Thornton, whether you're looking for an easy short mountain biking trail or a long mountain biking trail, you'll find what you're looking for. Click on a mountain biking trail below to find trail descriptions, trail maps, photos, and reviews.

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Activities
Length
Surfaces
Type
14 Results
Activities
Length
Surfaces
Type

Bear Creek Trail (Denver)

9.1 mi
State: CO
Asphalt, Concrete, Dirt, Gravel

Big Dry Creek Trail (Westminster)

12 mi
State: CO
Concrete, Crushed Stone

Corridor Trail

0.8 mi
State: CO
Ballast, Concrete, Crushed Stone

Fairmount Trail

3.7 mi
State: CO
Dirt, Gravel

Fraser River Trail

6.3 mi
State: CO
Asphalt, Crushed Stone

Great Western Trail (CO)

4.4 mi
State: CO
Crushed Stone, Dirt

High Line Canal Trail (CO)

71 mi
State: CO
Asphalt, Concrete, Dirt, Gravel

Lee Gulch Trail

4.6 mi
State: CO
Concrete, Crushed Stone

Longmont-to-Boulder Regional Trail

10.8 mi
State: CO
Asphalt, Concrete, Dirt, Gravel

Narrow Gauge Trail (CO)

2 mi
State: CO
Crushed Stone

Railroad Bed Trail

2.1 mi
State: CO
Dirt

Sand Creek Regional Greenway

14 mi
State: CO
Concrete, Crushed Stone

Switzerland Trail

14 mi
State: CO
Dirt, Gravel

Willow Creek Greenbelt Trail

6.1 mi
State: CO
Asphalt, Concrete, Crushed Stone
Trail Image Trail Name States Length Surface Rating
The Bear Creek Trail provides a taste of the country in the city, connecting downtown Denver with the foothills of the Rockies. Along the way, enjoy scenic views of woodlands, meadows and Bear Creek,...
CO 9.1 mi Asphalt, Concrete, Dirt, Gravel
Big Dry Creek Trail follows an east-west course for 12 miles between Interstate 25 and Standley Lake in Westminster, one of Denver's northern suburbs. The trail is generally flat, with short stretches...
CO 12 mi Concrete, Crushed Stone
Note: Like most of Lyons' parks system, the Corridor Trail has been closed since a devastating flood in September 2013. Work is currently underway to reopen the closed parks and trails. See the city's...
CO 0.8 mi Ballast, Concrete, Crushed Stone
Following a narrow, manmade waterway, the Fairmount Trail winds its way from Arvada to Golden. Along this flat, gravel and dirt pathway, trail-goers will enjoy scenic views of North Table Mountain and...
CO 3.7 mi Dirt, Gravel
The Fraser River Trail runs between the town of Fraser and Winter Park, paralleling US 40 for its entire route. The trail offers lovely views of the surrounding mountains and is a great way to connect...
CO 6.3 mi Asphalt, Crushed Stone
Two unpaved segments of the Great Western Trail are currently open in rural Weld County at the northwestern corner of Colorado's Eastern Plains. Both portions were built on a railbanked Great Western...
CO 4.4 mi Crushed Stone, Dirt
The High Line Canal Trail is a popular stretch of path through Denver's southside suburbs, winding for 71 miles between Aurora and Roxborough State Park. The trail is owned and operated by Denver...
CO 71 mi Asphalt, Concrete, Dirt, Gravel
In comparison to some of the lengthy, fantastic trails in the southern suburbs of Denver, the Lee Gulch Trail may not seem like anything special. However, it offers a wonderfully useful off-road...
CO 4.6 mi Concrete, Crushed Stone
The Longmont-to-Boulder Regional Trail (nicknamed the LOBO) extends more than 10 miles between these two major cities and taps into the region's vast network of trails. Most of the pathway has a...
CO 10.8 mi Asphalt, Concrete, Dirt, Gravel
Gaining only 200+ feet in elevation, the Narrow Gauge Trail is in Pine Valley Ranch Park, a beautiful open space near the mountain community of Pine, Colorado. The trail follows the north bank of the...
CO 2 mi Crushed Stone
Located on Aurora’s south end, the Railroad Bed Trail offers a 2-mile diagonal pathway within Cherry Creek State Park, a recreational gem with opportunities for camping, fishing, swimming and...
CO 2.1 mi Dirt
The Sand Creek Regional Greenway follows Sand Creek in Denver's northeast metro area. The southern end of the trail, through Denver and Aurora, has a soft surface, which can make for a dusty ride when...
CO 14 mi Concrete, Crushed Stone
The Switzerland Trail in the peaks west of Boulder was named for the spectacular mountain scenery along this remote and former railroad route. Although why it had to be named after another country...
CO 14 mi Dirt, Gravel
The Willow Creek Greenbelt Trail is a six mile, paved and soft-surface trail that runs along a creekbed in the suburban area around Centennial. The trail begins in the north outside the Holly Park...
CO 6.1 mi Asphalt, Concrete, Crushed Stone

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Trails by activity

Bear Creek Trail (Denver)

CO - 9.1 miles

The Bear Creek Trail provides a taste of the country in the city, connecting downtown Denver with the foothills of the Rockies. Along the way, enjoy scenic views of woodlands, meadows and Bear Creek,...

High Line Canal Trail (CO)

CO - 71 miles

The High Line Canal Trail is a popular stretch of path through Denver's southside suburbs, winding for 71 miles between Aurora and Roxborough State Park. The trail is owned and operated by Denver...

Big Dry Creek Trail (Westminster)

CO - 12 miles

Big Dry Creek Trail follows an east-west course for 12 miles between Interstate 25 and Standley Lake in Westminster, one of Denver's northern suburbs. The trail is generally flat, with short stretches...

Great Western Trail (CO)

CO - 4.4 miles

Two unpaved segments of the Great Western Trail are currently open in rural Weld County at the northwestern corner of Colorado's Eastern Plains. Both portions were built on a railbanked Great Western...

Accordion

Longmont-to-Boulder Regional Trail

CO - 10.8 miles

The Longmont-to-Boulder Regional Trail (nicknamed the LOBO) extends more than 10 miles between these two major cities and taps into the region's vast network of trails. Most of the pathway has a...

Willow Creek Greenbelt Trail

CO - 6.1 miles

The Willow Creek Greenbelt Trail is a six mile, paved and soft-surface trail that runs along a creekbed in the suburban area around Centennial. The trail begins in the north outside the Holly Park...

Lee Gulch Trail

CO - 4.6 miles

In comparison to some of the lengthy, fantastic trails in the southern suburbs of Denver, the Lee Gulch Trail may not seem like anything special. However, it offers a wonderfully useful off-road...

Narrow Gauge Trail (CO)

CO - 2 miles

Gaining only 200+ feet in elevation, the Narrow Gauge Trail is in Pine Valley Ranch Park, a beautiful open space near the mountain community of Pine, Colorado. The trail follows the north bank of the...

Fraser River Trail

CO - 6.3 miles

The Fraser River Trail runs between the town of Fraser and Winter Park, paralleling US 40 for its entire route. The trail offers lovely views of the surrounding mountains and is a great way to connect...

Corridor Trail

CO - 0.8 miles

Note: Like most of Lyons' parks system, the Corridor Trail has been closed since a devastating flood in September 2013. Work is currently underway to reopen the closed parks and trails. See the city's...

High Line Canal Trail (CO)

CO - 71 miles

The High Line Canal Trail is a popular stretch of path through Denver's southside suburbs, winding for 71 miles between Aurora and Roxborough State Park. The trail is owned and operated by Denver...

Great Western Trail (CO)

CO - 4.4 miles

Two unpaved segments of the Great Western Trail are currently open in rural Weld County at the northwestern corner of Colorado's Eastern Plains. Both portions were built on a railbanked Great Western...

Willow Creek Greenbelt Trail

CO - 6.1 miles

The Willow Creek Greenbelt Trail is a six mile, paved and soft-surface trail that runs along a creekbed in the suburban area around Centennial. The trail begins in the north outside the Holly Park...

Accordion

Fraser River Trail

CO - 6.3 miles

The Fraser River Trail runs between the town of Fraser and Winter Park, paralleling US 40 for its entire route. The trail offers lovely views of the surrounding mountains and is a great way to connect...

Bear Creek Trail (Denver)

CO - 9.1 miles

The Bear Creek Trail provides a taste of the country in the city, connecting downtown Denver with the foothills of the Rockies. Along the way, enjoy scenic views of woodlands, meadows and Bear Creek,...

Switzerland Trail

CO - 14 miles

The Switzerland Trail in the peaks west of Boulder was named for the spectacular mountain scenery along this remote and former railroad route. Although why it had to be named after another country...

Railroad Bed Trail

CO - 2.1 miles

Located on Aurora’s south end, the Railroad Bed Trail offers a 2-mile diagonal pathway within Cherry Creek State Park, a recreational gem with opportunities for camping, fishing, swimming and...

Narrow Gauge Trail (CO)

CO - 2 miles

Gaining only 200+ feet in elevation, the Narrow Gauge Trail is in Pine Valley Ranch Park, a beautiful open space near the mountain community of Pine, Colorado. The trail follows the north bank of the...

Sand Creek Regional Greenway

CO - 14 miles

The Sand Creek Regional Greenway follows Sand Creek in Denver's northeast metro area. The southern end of the trail, through Denver and Aurora, has a soft surface, which can make for a dusty ride when...

Lee Gulch Trail

CO - 4.6 miles

In comparison to some of the lengthy, fantastic trails in the southern suburbs of Denver, the Lee Gulch Trail may not seem like anything special. However, it offers a wonderfully useful off-road...

Fairmount Trail

CO - 3.7 miles

Following a narrow, manmade waterway, the Fairmount Trail winds its way from Arvada to Golden. Along this flat, gravel and dirt pathway, trail-goers will enjoy scenic views of North Table Mountain and...

Big Dry Creek Trail (Westminster)

CO - 12 miles

Big Dry Creek Trail follows an east-west course for 12 miles between Interstate 25 and Standley Lake in Westminster, one of Denver's northern suburbs. The trail is generally flat, with short stretches...

Longmont-to-Boulder Regional Trail

CO - 10.8 miles

The Longmont-to-Boulder Regional Trail (nicknamed the LOBO) extends more than 10 miles between these two major cities and taps into the region's vast network of trails. Most of the pathway has a...

Fairmount Trail

CO - 3.7 miles

Following a narrow, manmade waterway, the Fairmount Trail winds its way from Arvada to Golden. Along this flat, gravel and dirt pathway, trail-goers will enjoy scenic views of North Table Mountain and...

Narrow Gauge Trail (CO)

CO - 2 miles

Gaining only 200+ feet in elevation, the Narrow Gauge Trail is in Pine Valley Ranch Park, a beautiful open space near the mountain community of Pine, Colorado. The trail follows the north bank of the...

High Line Canal Trail (CO)

CO - 71 miles

The High Line Canal Trail is a popular stretch of path through Denver's southside suburbs, winding for 71 miles between Aurora and Roxborough State Park. The trail is owned and operated by Denver...

Great Western Trail (CO)

CO - 4.4 miles

Two unpaved segments of the Great Western Trail are currently open in rural Weld County at the northwestern corner of Colorado's Eastern Plains. Both portions were built on a railbanked Great Western...

Accordion

Railroad Bed Trail

CO - 2.1 miles

Located on Aurora’s south end, the Railroad Bed Trail offers a 2-mile diagonal pathway within Cherry Creek State Park, a recreational gem with opportunities for camping, fishing, swimming and...

Bear Creek Trail (Denver)

CO - 9.1 miles

The Bear Creek Trail provides a taste of the country in the city, connecting downtown Denver with the foothills of the Rockies. Along the way, enjoy scenic views of woodlands, meadows and Bear Creek,...

Switzerland Trail

CO - 14 miles

The Switzerland Trail in the peaks west of Boulder was named for the spectacular mountain scenery along this remote and former railroad route. Although why it had to be named after another country...

Lee Gulch Trail

CO - 4.6 miles

In comparison to some of the lengthy, fantastic trails in the southern suburbs of Denver, the Lee Gulch Trail may not seem like anything special. However, it offers a wonderfully useful off-road...

Sand Creek Regional Greenway

CO - 14 miles

The Sand Creek Regional Greenway follows Sand Creek in Denver's northeast metro area. The southern end of the trail, through Denver and Aurora, has a soft surface, which can make for a dusty ride when...

Fraser River Trail

CO - 6.3 miles

The Fraser River Trail runs between the town of Fraser and Winter Park, paralleling US 40 for its entire route. The trail offers lovely views of the surrounding mountains and is a great way to connect...

Willow Creek Greenbelt Trail

CO - 6.1 miles

The Willow Creek Greenbelt Trail is a six mile, paved and soft-surface trail that runs along a creekbed in the suburban area around Centennial. The trail begins in the north outside the Holly Park...

Longmont-to-Boulder Regional Trail

CO - 10.8 miles

The Longmont-to-Boulder Regional Trail (nicknamed the LOBO) extends more than 10 miles between these two major cities and taps into the region's vast network of trails. Most of the pathway has a...

Corridor Trail

CO - 0.8 miles

Note: Like most of Lyons' parks system, the Corridor Trail has been closed since a devastating flood in September 2013. Work is currently underway to reopen the closed parks and trails. See the city's...

Big Dry Creek Trail (Westminster)

CO - 12 miles

Big Dry Creek Trail follows an east-west course for 12 miles between Interstate 25 and Standley Lake in Westminster, one of Denver's northern suburbs. The trail is generally flat, with short stretches...

Recent Trail Reviews

Bear Creek Trail (Denver)

love this trail

September, 2018 by emilee.23

Great scenery, easy trail.

Mary Carter Greenway (Arapahoe Greenway)

love this trail

September, 2018 by emilee.23

I bike this trail every few weeks or so. Great scenery, people are courteous.

Cherry Creek Regional Trail

Riding our Recumbent Trikes along the Cherry Creek Trail

September, 2018 by bjandjoondo

We rode the section from the McCabe Meadows Trail Head to the Cherry Creek Reservoir around 27 miles round trip. Although it's mostly only 8 ft. wide, the trail is in very good shape and has lot's of wooded, prairie and urban sections. It's a mellow ride with very few big inclines! We really appreciated that there were several trail heads with facilities (restrooms, picnic table, etc.). We plan to ride the next section north into Down Town Denver soon, we really enjoyed this trail!

Accordion

Coal Creek Regional Trail

Nice trail

August, 2018 by greg131

I started on S Public road in Lafayette. The trail is well marked and a mixture of gravel, small sections of concrete. There were underpasses to avoid major roads. The countryside was pretty, starting out very lush by the creek, then turning more arid from Lafayette to Eire. There are sections of the trail that were washed out, so while biking, care is needed to navigate those sections. There is a good deal of wild life in and around the trail. Watch out for several prairie dog holes right in the middle of the trail. Bring water and some snacks. Overall, I would recommend the trail.

Loveland Recreation Trail

Still not finished

August, 2018 by rockymtnman.007

Rode this trail Aug 27th 2018, it forms a loop 21+ mile loop around Loveland Co. The eastern part of the trail is excellent as it goes north from US 34 through the seven lakes area and continues along the west shore of Boyd Lake. At the north end of Boyd Lake the trail splits. The Loveland loop heads straight west for 2-3 miles and passes under highway 287. (Optionally, one can turn north and connect to the Ft Collins trails). This part of the trail is in excellent condition, fully paved and 12 feet wide. Once under 287 the trail itself heads west for about 1/2 mile where it ends. At this point one can ride or walk along about 100 yards or so of dirt to 57th street. 57th street is busy and has no bike lane, but now there is only about 300 yards along 57th street to the new long view trail parking lot. (Optionally, one can ride along 57th street from 287 to the long view trail parking lot, a distance of 1/2 mile or more). The long view trail opened on Aug. 18th 2018 and connects the west side Loveland trails with the Ft Collins trails. It follows along Taft ave in Loveland which is Shields in Ft Collins. So, at this point one can choice to go north on the long view trail to Ft Collins or go south along the west side of Loveland to complete the loop around Loveland. To go south one crosses to the southwest corner of 57th street and Taft ave where the trail continues south. This part of the trail is in excellent condition, paved and 12 feet wide. There is a short section along Wilson avenue that is bike lane instead of trail, but the trail picks up again and continues south where it goes under US 34. At the “T” turn left (east) and continue to Namaque Ave. Here the pavement ends but the trail continues straight along the canal on dirt to Wilson. Turn south along Wilson and then under Wilson where the trail heads straight east along the Thompson River and into RxR park, go around the north end of the park and then swing south. The path will turn east again and go under highway 287 and swing north, up the hill and onto Washington Street. The stretch along Washington is only 1/2 mile long to 1st street. Cross 1st street, and continue east to the Chilson Center where is turns straight north, across 4th street and continue north under Madison street and then across Boise and back to US 34. For the remainder of 2018 Wilson is under construction and access to the trail at Wilson is closed. So, at Namaque Ave, turn south on Namaque to 1st street, east on 1st street to Dotsero Dr, north on Dotsero through a neighborhood where there is access to the trail again. Parking is available at the Walmart on highway 34 & Denver Ave, at the Chilson Center, at the RxR park, at Mehaffey Park, and on the street in many other locations along the trail. This will be a great trail once finished, but for now it still has a couple of rough spots.

Poudre Trail (Fort Collins)

Nice concrete trail

August, 2018 by jaredallison

I was a bit skeptical of this trail at first since it starts out quite twisty and winding with a lot of debris from the trees. It also passes a few parking lots but once that’s behind you it starts to get much nicer. There are only a couple of road crossings - the rest you go underneath the bridges with the stream that parallels much of the trail. I did most of the trail on inline skates and it worked out fine.

Lake Link Trail

A community connector

August, 2018 by laurastark

We bike a portion of the Lake Link Trail just east of Sheridan Boulevard every weekday morning and afternoon to take our daughter to and from her elementary school. We love it! It makes for such a pleasant commute as the trail runs along a pretty creek with tall grasses and trees set amid a quiet residential neighborhood. Here, the trail is paved and well-used by families with young children.

Bear Creek Trail (Denver)

highly recommend

August, 2018 by uschiny

Fun and very scenic trail. Start in Denver and make your way to Morrison. You get the Roi it if the way and it will be a joyful ride back. Serene with wonderful views and not too crowded. Loved it

Westerly Creek Trail

Wrong Turn and Ended Up On This One

August, 2018 by acewickwire

Sort of a nice ride through green space and parks. Only went a few miles from the north end (Expo Park) to Utah Park. Started on High Line Canal Trail but poorly marked trail and this seemed like the trail to follow. Okay trail if in the locale but not one to go out the way for.

Lake Link Trail

East end of the trail is good for biking

August, 2018 by greg131

The trail is great from McKay lake to Sagar reservoir, then it changes to a road trail. The western end has steep turns and switchbacks over a gravel trail. Very difficult to follow as the trail markings are inconsistent. Sections of the trail are arid and remote. Bring snacks and water. Look for prairie dogs and other wildlife along the trail. Recommend a cruising bike or a mountain bike with wide tires. The large portions of gravel make it unsuitable for a road bike.

Big Dry Creek Trail (Westminster)

Great trail w gravel and paved

August, 2018 by starbucknos

Noticed the only people complaining are runners. There is a nice gravel trail alongside it for much of the time, which I walked and ran for years with my kids in a stroller. We just took our first epic bike ride from Butterfly Pavion to College Hill library, stopping in btw to wade, play in parks, and have tons of fun. Its an awesome trail and not even crowded on a Saturday.

Poudre River Trail

Smooth

August, 2018 by negangardo

Skated from Greeley to Windsor and back. The trail is very smooth and flat and an easy trip. Bring lots of water though, as I didn't find any along the way. Also beware of cattle grates instead of pavement around milemarker 14. Otherwise A+!

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