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Routes
Road cycling routes
United States
Colorado
Jefferson County
Westminster

Loop around Thornton

Moderate

3.5

(10)

22

riders

Loop around Thornton

03:05

66.3km

370m

Road cycling

This moderate 41.2-mile road cycling loop around Thornton offers varied scenery, including river views and Rocky Mountain vistas.

Last updated: February 26, 2026

Waypoints

A

Start point

Parking

Get Directions

1

3.68 km

Walnut Creek Open Space

Highlight • Forest

Walnut Creek Open Space is one of Westminster's many open space parks that are connected to one another through over 120 miles of trails.

Tip by

2

16.7 km

The Field Open Space

Highlight • Natural

Explore rolling grasslands teeming with wildflowers in spring and summer, transitioning into vibrant aspen forests ablaze with golden hues in autumn. Immerse yourself in the changing seasons and their unique beauty.

Tip by

3

49.1 km

The bike path offers excellent views over the several lakes in the surroundings.

Tip by

B

66.3 km

End point

Parking

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Way Types & Surfaces

Way Types

45.9 km

16.0 km

2.48 km

1.18 km

448 m

159 m

< 100 m

Surfaces

34.0 km

32.1 km

127 m

< 100 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (1,670 m)

Lowest point (1,530 m)

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Weather

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Today

Tuesday 2 June

24°C

14°C

79 %

Additional weather tips

Max wind speed: 19.0 km/h

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This route was planned by komoot.

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Frequently Asked Questions

Where can I park to access the Loop around Thornton route?

Since this route utilizes an extensive network of interconnected trails around Thornton, there are multiple access points with parking. Many parks along the route, such as those near the Walnut Creek Open Space or the The Field Open Space, offer parking facilities. You can also look for parking near major trailheads that are part of the network, such as those for the South Platte River Trail or Big Dry Creek Trail.

Is the Loop around Thornton route dog-friendly?

Yes, the trails that make up this loop are generally dog-friendly. Dogs are typically allowed on a leash. Always ensure your dog is under control and clean up after them to help maintain the trails for everyone.

What is the best time of year to cycle this route?

The best time to cycle this route is generally from spring through fall. Spring offers pleasant temperatures and blooming scenery, while fall provides cooler weather and often vibrant foliage. Summer can be enjoyable, but be prepared for warmer temperatures, especially in the afternoon. Winter cycling is possible, but some sections may be icy or snow-covered, requiring appropriate gear and caution.

Do I need any permits or pay fees to cycle this loop?

No, you do not need any special permits or to pay entrance fees to cycle the public trails that comprise the Loop around Thornton route. Access to the extensive network of paved trails in the Thornton area is generally free.

What kind of terrain and surfaces can I expect on this loop?

The Loop around Thornton route is primarily designed for road bikes, so you can expect mostly paved surfaces, including asphalt and concrete. The terrain is largely flat to gently rolling, especially along river corridors and through urban green spaces. However, be aware that some sections, particularly if the route incorporates parts of trails like the Farmer's High Line Canal Trail, might include a mix of crushed stone. This route is ideal for a smooth road cycling experience.

How challenging is the Loop around Thornton route for road cyclists?

This route is rated as moderate. While the overall elevation gain of approximately 374 meters is manageable over 66 kilometers, the distance itself requires a good level of fitness. The terrain is mostly flat to gently rolling, without significant sustained climbs, making it accessible for cyclists with some experience looking for a longer ride.

What are some notable sights or natural features along the way?

The route offers a mix of urban green spaces and natural riparian corridors. You'll pass through areas like the Walnut Creek Open Space and The Field Open Space. A highlight is the South Platte River and lake viewpoint, offering scenic views. You might also spot wildlife, including prairie dogs, along sections that follow the South Platte River, Big Dry Creek, and Grange Hall Creek.

Does this route connect with other major cycling trails?

Yes, this route is part of Thornton's highly interconnected trail system. It utilizes sections of several well-known paths, including the US 36 Bikeway, Rocky Mountain Greenway Trail, Denver Orbital Trail, Clear Creek Trail, South Platte River Trail, Big Dry Creek Trail, and Grange Hall Trail. This connectivity allows for diverse and customizable cycling experiences, linking to broader regional networks.

Is this cycling loop suitable for families?

While the route is rated 'moderate' due to its 66 km distance, the predominantly paved and relatively flat terrain makes sections of it suitable for families with older children or those comfortable with longer rides. For younger children or less experienced family members, consider cycling shorter segments of the interconnected trails that make up this loop, such as those within local parks or along the Big Dry Creek Trail, which are generally easier.

Are there amenities like cafes or restrooms along the route?

Given that the route passes through urban green spaces and connects various communities, you will find opportunities for amenities. Many parks along the trail network offer restrooms. For cafes or other services, you may need to make short detours into nearby residential or commercial areas. It's always a good idea to carry sufficient water and snacks, especially for longer stretches.

Is the Loop around Thornton a continuous loop?

Yes, the 'Loop around Thornton' is designed as a continuous loop. It leverages the extensive network of paved trails in and around Thornton, Colorado, allowing cyclists to complete a full circuit without needing to retrace their steps.

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