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Routes
Mountain biking trails
United States
Colorado
Larimer County

Blue Sky and Indian Summer Loop

Moderate

5.0

(2327)

18,814

riders

Blue Sky and Indian Summer Loop

01:40

17.5km

290m

Mountain biking

This 10.9-mile mountain biking loop in Rim Rock Open Space offers moderate terrain, flowy singletrack, and expansive views near Fort Collins

Last updated: February 26, 2026

Waypoints

A

Start point

Parking

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1

1.14 km

Blue Sky Trail (Northern Section)

Highlight (Segment) • Trail

The Blue Sky Trail is a generally casual, super fun trail along a ridge, just south of Horsetooth Reservoir. This long trail runs north-south from Horsetooth Reservoir, through Rim Rock …

Tip by

2

7.73 km

Indian Summer Loop

Highlight (Segment) • Trail

The Indian Summer Trail is a short, fun loop off of the main Blue Sky Trail. Most ride this loop clockwise, ascending a few hundred feet of low-grade switchbacks before reaching a flowy descent.

Tip by

B

17.5 km

End point

Parking

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Way Types & Surfaces

Way Types

16.5 km

709 m

272 m

< 100 m

Surfaces

17.1 km

291 m

< 100 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 (1,760 m)

Lowest point (1,660 m)

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Weather

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Today

Saturday 9 May

23°C

6°C

13 %

Additional weather tips

Max wind speed: 23.0 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 Blue Sky and Indian Summer Loop?

The Blue Sky and Indian Summer Loop is accessible from various points within the Rim Rock Open Space. Popular parking options are typically found near the Devil's Backbone Open Space or other trailheads that connect to the Blue Sky Trail. Always check local signage for specific parking regulations and availability.

Are there any permits or fees required to ride this trail?

As this loop is located within the Rim Rock Open Space, managed by Larimer County, there may be specific regulations or fees depending on the access point. It's always best to check the official Larimer County Natural Resources website or local signage for the most current information regarding permits or entrance fees for the area.

Is the Blue Sky and Indian Summer Loop suitable for beginner mountain bikers?

The overall loop is generally considered intermediate. While the Blue Sky Trail (Northern Section) portion is often described as flowy and suitable for beginners, the addition of the Indian Summer Loop introduces more challenging climbs and descents, elevating the difficulty. Beginners comfortable with some moderate climbing and technical sections might enjoy it, but pure novices might find the Indian Summer section demanding.

What is the terrain like on this mountain bike loop?

The trail primarily features flowy singletrack with smooth, packed dirt. You'll encounter rolling terrain, curvy sections, and moderate climbs. While mostly clear, some sections may have a few rocks and occasional 'steps' that can be technical. Be aware that certain downhill sections can have loose sand, especially in turns.

How long does it typically take to complete this mountain bike loop?

This mountain bike loop, covering approximately 17.5 km (10.9 miles), typically takes around 1 hour and 40 minutes to complete. This duration can vary based on your fitness level, riding speed, and how often you stop to enjoy the views.

What kind of views can I expect along the route?

The loop traverses an open landscape, offering expansive views of Fort Collins and the surrounding rolling hills and mountains. You'll also get glimpses of the geological features of the Devil's Backbone area. Due to its exposed nature, there's little shade, ensuring uninterrupted vistas.

Does this trail connect to other mountain biking routes?

Yes, the Blue Sky Trail acts as a significant corridor, connecting to a vast network of other trails and open spaces. This route specifically incorporates sections of the Blue Sky Trail and the Indian Summer Trail. It also intersects with or runs alongside parts of the Inlet Bay Trail, Indian Creek Road, and Rim Rock Trail, allowing for extended ride options.

Is the Blue Sky and Indian Summer Loop dog-friendly?

Generally, dogs are allowed on trails within Larimer County Open Spaces, but they must be kept on a leash at all times. Always check specific regulations at the trailhead or on the Larimer County Natural Resources website, as rules can vary or change.

What is the best time of year to mountain bike this loop?

The trail is popular during the 'Indian Summer' months (late summer to fall) for its pleasant temperatures and clear skies. However, due to its exposed nature, it can be ridden year-round, though summer rides might be very hot due to lack of shade. Spring and fall offer ideal conditions.

What should I be aware of regarding safety on the trail?

Be prepared for significant sun exposure as there is very little shade. The trail can also have several blind corners, so ride cautiously, especially on weekends when it can be busy. There is also a possibility of encountering rattlesnakes, so stay vigilant and give wildlife space.

What should I bring for a ride on this loop?

Given the sun exposure and moderate length, bring plenty of water, sunscreen, and appropriate sun protection (hat, sunglasses). A helmet is essential for mountain biking. Snacks are recommended for energy, and basic bike repair tools are always a good idea.

Nearby routes

Hard

42

Devil's Backbone Indian Summer Loop

01:53h

18.9km

370m

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