more stats
3,770 ft
Distance
102 ft
Climb
-108 ft
Descent
1,564 ft
High Point
-5 ft
Altitude change
1,490 ft
Altitude min
1,551 ft
Altitude start
1,545 ft
Altitude end
-0.1%
Grade
-19.3%
Grade max
17.3%
Grade min
1,716 ft
Distance climb
1,476 ft
Distance down
558 ft
Distance flat

Foundation Loop Details

  • Activities
    • Mountain Bike
    • Hike
    • Trail Running
  • Riding Area
    Brooktrails Greenbelt
    Willits, California
  • Difficulty Rating
    Green Rate
  • Local Popularity
    95 in Mountain Biking [+]
    • 100 in Trail Running
    • 95 in Hiking
  • Global Ranking
    #143379 in Mountain Biking [+]
    • #19237 in Trail Running
    • #21458 in Hiking
  • Trail Type
    Singletrack
  • Direction
    Both Directions
  • Climb Difficulty
    Green
  • Physical Rating
    Easy
  • Dogs Allowed
    Yes

Foundation Loop is the greenest trail on the Anthill. It is a great place to start for those just getting into mountain biking and looking to ride some singletrack, and it's also pretty fun for more advanced riders. This loop works well in either direction, and serves as the return climb back over to Climb Time for riders looking to ride laps on the progressive trails down from the peak.

It is the first machine-built mountain bike trail in the Brooktrails Greenbelt, built by Downtime Trails and Ben Chang in 2024 with a grant from the Community Foundation of Mendocino County and help from WAC volunteers.

Local Trail Association
Traditionally Indigenous Territory

Recent Activity on Trail

Past Week
  • 3 rides
  • 11 miles average
6 Months
  • 88 rides
  • 8 miles avg distance
All
  • 225 rides
  • Last: Sep 5, 2026
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Foundation Loop Trail Reports

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Status:
Avg: 4 (1 votes)
Your vote: 0

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  • Snow Covered
  • Snow Cover Partial
  • Freeze/thaw Cycle
  • Icy
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  • Wet
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  • Ideal
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        Directions to foundation-loop-749139 trailhead (39.432050, -123.382860)
        View on Discover Map

        Photos

        4 more »
        mtb
        46 |
        Jul 7, 2026 @ 4:00pm
        Jul 7, 2026
        mtb
        35 |
        Jul 7, 2026 @ 3:59pm
        Jul 7, 2026
        mtb
        98 |
        Mar 13, 2025 @ 10:03am
        Mar 13, 2025
        mtb
        77 |
        Mar 13, 2025 @ 10:03am
        Mar 13, 2025

        Videos

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        4.0 ★★★★★
        1 Ratings
        5 ★
        4 ★ 100%
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        1 ★

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        Nearby Trails

        Brooktrails Greenbelt

        • By a-sherfTF Pro WAC & contributors
        • #749139 - 575 views

        Frequently Asked Questions About Foundation Loop

        ▼ Where is Foundation Loop located?
        Foundation Loop is located in Brooktrails Greenbelt, Willits, California, United States. It is part of the Brooktrails Greenbelt trail network. The trailhead is located at coordinates 39.43205, -123.38286.
        ▼ How hard is Foundation Loop?
        Foundation Loop is rated as Green difficulty. The physical rating is Easy. The average grade is 0.1%. The climb difficulty is rated Green.
        ▼ What is the elevation gain for Foundation Loop?
        Foundation Loop has 102 ft of elevation gain. The trail has 108 ft of elevation descent. The elevation ranges from 1,490 ft to 1,564 ft.
        ▼ Is Foundation Loop a point to point trail?
        Foundation Loop is not a point to point trail. The direction is Both Directions. The trail type is singletrack.
        ▼ How long is Foundation Loop?
        Foundation Loop is 3,770 ft long. The trail type is singletrack.
        ▼ Are dogs allowed on Foundation Loop?
        Yes, dogs are allowed on Foundation Loop. Please keep dogs on a leash where required and clean up after them.
        ▼ How do I access Foundation Loop? Where is the closest parking trailhead?
        The closest parking and trailhead locations to Foundation Loop are: View all parking locations in the area.
        ▼ How busy is Foundation Loop?
        Foundation Loop is a very popular trail. There have been 327 recorded activities on this trail. The trail has received 817 check-ins. View recent activity on this trail.

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