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Routes
Mountain biking trails
United States
Missouri
St. Charles County

Lost Valley Trail Loop

Easy

2.6

(30)

31

riders

Lost Valley Trail Loop

01:39

18.4km

210m

Mountain biking

Get ready for an easy mountain biking adventure on the Lost Valley Trail Loop, a route that spans 11.4 miles (18.4 km) with a gentle 693 feet (211 metres) of elevation gain. You can expect to complete this ride in about 1 hour and 38 minutes. The trail winds through…

Last updated: April 23, 2026

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Your route passes through a protected area

Please check local regulations for:

Weldon Spring Conservation Area

Waypoints

A

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Parking

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1

14.1 km

Weldon Spring Conservation Area

Highlight • Forest

From tough singletrack to smooth double-track, the Weldon Spring Conservation Area has a variety of trails that are great for riding. Be aware: just because a trail has the word …

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18.4 km

End point

Parking

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Way Types & Surfaces

Way Types

18.4 km

< 100 m

Surfaces

12.4 km

5.97 km

< 100 m

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Elevation

Elevation

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Weather

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Today

Thursday 7 May

20°C

4°C

0 %

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Max wind speed: 22.0 km/h

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This route was planned by komoot.

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Frequently Asked Questions

How long does it typically take to mountain bike the Lost Valley Trail Loop?

The full 10.5 to 11.5-mile loop can take approximately two hours for some riders, especially given the amount of singletrack and challenging rocky areas. Your duration may vary based on your skill level and how often you stop to enjoy the scenery.

Is the Lost Valley Trail Loop suitable for beginner mountain bikers?

While generally considered moderate, some sections of the trail are manageable for novices, particularly the hard-packed areas. However, be aware that certain singletrack sections, like the 'beaver pond section,' feature narrow tread and rough, technical terrain with 'punchy rock obstacles.' Riding it clockwise is often suggested for easier climbs.

What is the terrain like on this mountain biking trail?

The trail offers a diverse experience with a mix of doubletrack and singletrack sections. You'll encounter gravel, dirt, and rock surfaces, including some hard-packed areas, but also loose gravel and ruts. Expect 'super-flowy' singletrack punctuated by technical rock obstacles and a 'root ball section.' It generally drains well, except in lower creek bottoms.

What kind of scenery and natural features can I expect along the route?

Riders can enjoy a very scenic journey through timber and dells, featuring natural springs, rock formations, and clear-running streams. A unique highlight is a waterfall crossing. The trail is located within the beautiful Weldon Spring Conservation Area.

Are there any historical points of interest along the Lost Valley Trail Loop?

Yes, the area has a rich past. You'll encounter historical elements such as old homesteads and an old cemetery in an area referred to as 'Haunted Hollow.' The trail is also situated near a former World War II ammunition works and uranium processing plant, often called 'The Mound,' adding to its unique history.

Where can I park to access the Lost Valley Trail Loop?

Parking is available at the trailhead within the Weldon Spring Conservation Area. Specific parking areas are usually well-marked for trail access.

Are permits or entrance fees required for mountain biking in Weldon Spring Conservation Area?

No, permits or entrance fees are generally not required to access and ride the trails within the Weldon Spring Conservation Area. It's a public conservation area, but always check local regulations for any updates.

Is the Lost Valley Trail Loop dog-friendly?

Yes, dogs are generally allowed on the trails within the Weldon Spring Conservation Area. However, they must be kept on a leash at all times to protect wildlife and ensure a pleasant experience for all trail users.

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

The trail is enjoyable throughout much of the year. It generally drains well, making it accessible even after some rain. However, spring and fall offer pleasant temperatures and vibrant scenery. Winter riding is also possible, but be mindful of potential ice or snow conditions.

Can I ride the Lost Valley Trail Loop at night?

Yes, the trail is open until 10 p.m. daily, making it a viable option for night riding. If you plan to ride after dark, ensure you have appropriate lighting and safety gear.

What is the recommended direction to ride the Lost Valley Trail Loop?

While the trail can be ridden in both directions, riding it clockwise is often suggested. This direction can make the climbs feel easier and provides better visibility of trail markings, enhancing the overall riding experience.

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