Open Sky Loop – Lagerman Preserve Trailhead loop from Fentress Lake

Bike touring routes & trails

United States

Colorado

Boulder County

Open Sky Loop – Lagerman Preserve Trailhead loop from Fentress Lake

Moderate

3.5

(20)

riders

Open Sky Loop – Lagerman Preserve Trailhead loop from Fentress Lake

01:35

22.9km

170m

Cycling

Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Last updated: August 20, 2026

Waypoints

Start point

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339 m

N. 19th Street (Gravel between Niwot and Oxford)

Highlight (Segment) • Trail

This short gravel road is a nice way to connect Niwot Road to Oxford Road, where the Boulder Roubaix starts and ends, and other very popular gravel roads between Boulder …

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9.21 km

Open Sky Loop

Highlight (Segment) • Trail

The Open Sky Loop is a popular trail in the Lagerman Agricultural Preserve. It provides foot and cycle traffic a nice way to circumnavigate the preserve to enjoy the wildlife and landscape views.

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12.4 km

Lagerman Agricultural Preserve

Highlight • Natural

The Lagerman Agricultural Preserve and Reservoir is a small nature preserve that birders, boaters, picnickers, bikers, runners, and dog-walkers can all enjoy. You get great views of the foothills over …

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13.1 km

Lagerman Agricultural Preserve Singletrack Trails

Highlight • Trail

Could love more on the trails with soft and dry graves, some portion has hard rocks.

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13.2 km

Lagerman Preserve Trailhead

Highlight • Trail

There is streetside parking off of Pike. The trails here are flat, smooth, and fast. The Open Sky Loop which circumnavigates most of the preserve is a good route.

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