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Routes
Mountain biking trails
United States
Montana
Jefferson County

Lava Mountain loop

Moderate

4.8

(6358)

8,141

riders

Lava Mountain loop

02:50

28.5km

760m

Mountain biking

The Lava Mountain loop offers a rugged and demanding mountain biking experience, taking you through a landscape dominated by steep 4x4 roads and technical rock gardens. You'll navigate sections of loose rock and sand, deep ruts, and even fallen log obstacles, with a small lake providing a brief scenic respite.…

Last updated: June 9, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Helena National Forest

Waypoints

A

Start point

Parking

Get Directions

1

16.0 km

Lava Mountain Trail

Highlight (Segment) • Trail

Lava Mountain Trail is technical enough to challenge most riders. It's also part of the Great Divide Mountain Bike Route so theoretically you could keep riding up to Alberta, Canada or down to the Mexican border.

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B

28.5 km

End point

Parking

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Way Types & Surfaces

Way Types

20.8 km

5.10 km

2.69 km

Surfaces

15.7 km

7.79 km

5.03 km

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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 (2,260 m)

Lowest point (1,730 m)

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Weather

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Wednesday 1 July

17°C

8°C

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Frequently Asked Questions

Is the Lava Mountain loop suitable for beginner mountain bikers?

No, the Lava Mountain loop is generally considered hard for mountain biking, often rated as a black diamond or equivalent. It features significant technical challenges, including steep climbs, rocky sections, and obstacles that frequently require riders to push their bikes (hike-a-bike).

What is the terrain like on this mountain bike loop?

The terrain is varied and challenging. You can expect tight trees, fallen logs, and rutted sections. There's a short but technical boulder section that may require pushing your bike. The climb up Lava Mountain is steep with cascades of boulders, deep erosion, and downed trees. Some parts are doubletrack, combining dirt roads and OHV tracks. Be prepared for loose rock and sand in certain areas, and numerous fallen trees due to beetle kill.

When is the best time of year to mountain bike the Lava Mountain loop?

The best time to ride is typically from late spring through early fall. Early in the season, riders might encounter snow drifts, mud holes, and numerous fallen trees that can make the trail impassable or significantly more difficult. Always check current trail conditions before heading out.

Where can I park to access the Lava Mountain loop?

Access points are available, including roads from Clancy and a northern trailhead. Specific parking information for the Lava Mountain loop trailhead near Helena should be confirmed with local forest service offices or detailed trail maps, as conditions and access points can vary.

Is the Lava Mountain loop dog-friendly?

Yes, dogs are generally allowed on trails within the Helena-Lewis and Clark National Forest. However, they must be kept on a leash to protect wildlife and ensure a pleasant experience for all trail users. Always practice Leave No Trace principles, including packing out pet waste.

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

Typically, no specific permits or entrance fees are required for day use of trails within the Helena-Lewis and Clark National Forest. However, it's always a good idea to check the official National Forest website or local ranger district for any current regulations or advisories before your visit.

Does the Lava Mountain loop connect with other well-known trails?

Yes, a significant portion of the Lava Mountain Trail is part of the iconic Great Divide Mountain Bike Route (GDMBR), making it a well-known segment for long-distance cyclists and bikepackers.

What should I know about navigating the most challenging sections of the Lava Mountain loop?

Be prepared for significant challenges. The south end has a very steep, rocky section where most riders will need to walk their bikes. The 12-mile climb up Lava Mountain can be particularly 'ratchet' with obstacles. Due to frequent fallen trees from beetle kill, carrying tools like a small saw or axe might be beneficial, especially if you're bikepacking. Expect to push your bike in several spots, particularly with heavily loaded bikes.

What kind of scenery can I expect along the Lava Mountain loop?

While some access roads are less scenic, the descent from Lava Mountain can be quite gorgeous, especially as it follows alongside Cataract Creek. The loop passes through diverse forested areas, offering opportunities to experience the natural beauty of Montana.

How long does it typically take to complete the Lava Mountain loop?

The estimated duration for this 28.5 km (17.7 mi) mountain bike loop is around 2 hours and 50 minutes. However, due to its challenging terrain, technical sections, and potential obstacles, many riders, especially those with loaded bikes or less experience with such conditions, may take considerably longer.

Are there any specific highlights or points of interest on the route?

The route itself features the challenging and notable Lava Mountain Trail. This trail is particularly known for its technical difficulty and its inclusion as part of the Great Divide Mountain Bike Route. The descent alongside Cataract Creek also offers beautiful views.

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