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Routes
Mountain biking trails
United States
Idaho
Ada County
Boise

Crestline, Sidewinder, and Red Cliffs Loop

Routes
Mountain biking trails
United States
Idaho
Ada County
Boise

Crestline, Sidewinder, and Red Cliffs Loop

Hard

4.8

(2202)

5,625

riders

Crestline, Sidewinder, and Red Cliffs Loop

01:29

14.2km

350m

Mountain biking

This difficult 8.8-mile mountain biking loop in Hulls Gulch Reserve offers varied terrain, challenging climbs, and fun descents with great v

Last updated: February 26, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Boise Front Area of Critical Environmental Concern

Waypoints

A

Start point

Parking

Get Directions

1

3.07 km

Crestline Trail

Highlight (Segment) • Trail

Crestline had earned itself the nickname of "The Freeway" due to its popularity & the fact that it connects to many other trails in the area. Though it may not be the most exciting to ride it will get you to where you're going and the views of the surrounding mountains are pretty good too.

Tip by

2

6.90 km

Sidewinder Trail Summit

Highlight • Summit

top of the sidewinder climb great views, also a 4 way junction with trail 4.

Tip by

3

11.3 km

Red Cliffs Trail

Highlight (Segment) • Trail

Red Cliffs can be ridden up or downhill. Heading up is a gentle climb with not much in the way of technicality but if you go downhill it's fun a flowy. It's a multiuse trail so be courteous of other users especially when going downhill.

Tip by

4

12.6 km

Chickadee Ridge Trail

Highlight (Segment) • Trail

Chickadee Ridge is a popular short trail in Hull's Gulch which makes it good for a warm up or cool down. Definitely take it slow through here and enjoy the scenery.

Tip by

B

14.2 km

End point

Parking

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Way Types & Surfaces

Way Types

11.7 km

2.13 km

250 m

< 100 m

< 100 m

Surfaces

9.08 km

4.85 km

187 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.

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Weather

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Thursday 7 May

26°C

11°C

-- %

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This route was planned by komoot.

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Frequently Asked Questions

What is the overall difficulty of the Crestline, Sidewinder, and Red Cliffs Loop for mountain biking?

This loop is generally considered a difficult mountain bike ride, requiring good fitness and advanced riding skills due to significant climbs and technical descents. While some sections are more approachable, the full loop presents a moderate to difficult challenge.

Where can I park to access this trail, and are there any permits required?

The trail is located in the Boise Foothills, within the Hulls Gulch Reserve. Parking is typically available at trailheads accessing the reserve. No specific permits or entrance fees are mentioned for accessing the trails within Hulls Gulch Reserve itself, but always check local regulations before your visit.

What is the best time of year to mountain bike the Crestline, Sidewinder, and Red Cliffs Loop?

Spring and early summer are often recommended for riding this loop. The Sidewinder Trail Summit descent, known for its well-built turns, is particularly enjoyable during this period before it becomes excessively dusty and loose in late summer and fall due to motorcycle use.

Is the Crestline, Sidewinder, and Red Cliffs Loop dog-friendly?

Yes, the Boise Foothills trails, including this loop, are popular with dog walkers. However, always ensure your dog is on a leash and that you adhere to any specific rules or regulations posted within the Hulls Gulch Reserve regarding pets.

What kind of terrain can I expect on this mountain bike loop?

You'll encounter a mix of singletrack and wider trails. The Crestline Trail offers a gentle grade and wide tread, though it can be wet. The Sidewinder Trail Summit includes climbs and descents with excellent burmed turns. The Red Cliffs Trail provides a fun, open downhill segment. The overall scenery is dry and desert-like, offering good views throughout.

Are there any notable viewpoints or landmarks along the route?

Yes, the trail system provides good views of the surrounding dry, desert-like landscape of the Boise Foothills. Key sections include the Crestline Trail, the Sidewinder Trail Summit, and the Red Cliffs Trail, all offering distinct riding experiences and scenic moments.

Does this loop intersect with other trails in the Hulls Gulch Reserve?

Yes, this route is part of a larger network. It primarily uses sections of the #28 Crestline, #24 Sidewinder, and #39 Red Cliffs trails. You may also encounter parts of #39 Owls Roost, #39A Kestrel, and Chickadee Ridge #36A, among others, as you navigate the loop.

Is night riding permitted on these trails?

Yes, night riding is permitted in the Boise Foothills, including on trails within the Hulls Gulch Reserve. If you plan to ride at night, ensure you have appropriate lighting and safety gear.

What should I bring for a mountain bike ride on this loop?

Given the 'difficult' rating and varied terrain, you should bring plenty of water, especially during warmer months, as the area can be dry. Essential mountain biking gear, a repair kit, and appropriate safety equipment are also highly recommended. Consider sun protection due to the open nature of some sections.

Are there any specific considerations for riding the Sidewinder descent?

The Sidewinder Trail Summit descent is celebrated for its "very well burmed turns," making it a fast and enjoyable section. However, be aware that it can become quite dusty and loose in late summer and fall, partly due to motorcycle use. Spring and early summer offer the best conditions for this segment.

Is this a good trail for a quick ride after work?

Yes, the Crestline, Sidewinder, and Red Cliffs Loop is a popular choice for quick rides due to its accessibility and proximity to Boise. Its length and elevation gain offer a solid workout, making it suitable for a shorter, intense outing when time is limited.

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Three Bears and Two Point Trails Loop

00:48h

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