Crestline, Sidewinder, and Red Cliffs Loop
Crestline, Sidewinder, and Red Cliffs Loop
4.8
(2202)
5,625
riders
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
Start point
Parking
Get Directions
3.07 km
Highlight (Segment) • Trail
Tip by
6.90 km
Highlight • Summit
Tip by
11.3 km
Highlight (Segment) • Trail
Tip by
12.6 km
Highlight (Segment) • Trail
Tip by
14.2 km
End point
Parking
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
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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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.