Dirt Fondo
Fundraiser Details:

Join the Marin County Bicycle Coalition for the 13th annual Dirt Fondo on Saturday, July 19, 2025, an unforgettable off-road ride through Marin’s legendary trails and breathtaking scenery. Whether you’re a seasoned mountain biker or a gravel-curious adventurer, this event offers a unique way to explore the region’s natural beauty while supporting a great cause.

Riders can choose from 45-, 32-, or 24-mile route options, each winding from the Marin Headlands to the trails of Mt. Tam and back. Expect a satisfying mix of trails, fire roads, and tarmac - all with world-class ride support. Along the way, you’ll be cheered on by friendly volunteers, refuel at four energizer stations, and benefit from course marshals, sweeps, and SAG support.

The day wraps up with a festive post-ride party at the Presidio Riding Club Stables, complete with delicious food, community vibes, and plenty of dirt-earned high fives. Those who register as Trail Bosses will score bonus gear from Velocio.

This ride is more than just a challenge, it’s trail advocacy in motion. Proceeds benefit MCBC’s efforts to expand trail access, equitably share open space, and inspire the next generation of riders.

Register now at www.marinbike.org.

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Trail Conditions
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  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
Trail Flow (Ridden Direction)
Trailforks scans users activity logs to determine the most popular direction each trail is ridden. A good flowing trail network will have most trails flowing in a single direction according to their intension.
The colour categories are based on what percentage of users are riding a trail in its intended direction.
  • > 96%
  • > 90%
  • > 80%
  • > 70%
  • > 50%
  • < 50%
  • bi-directional trail
  • no data
Trail Last Ridden
Trailforks scans activity logs to determine the last time a trail was ridden.
  • < 2 days
  • < 1 week
  • < 2 weeks
  • < 1 month
  • < 6 months
  • > 6 months
Trail Ridden Direction
The intended direction a trail should be ridden.
  • Downhill Only
  • Downhill Primary
  • Both Directions
  • Uphill Primary
  • Uphill Only
  • One Direction
Contribute Details
Colors indicate trail is missing specified detail.
  • Description
  • Photos
  • Description & Photos
  • Videos
Trail Popularity ?
Trailforks scans activity logs to determine which trails are ridden the most in the last 9 months. Trails are compared with nearby trails in the same city region with a possible 25 colour shades. Think of this as a heatmap, more activities = more kinetic energy = warmer colors.
  • most popular
  • popular
  • less popular
  • not popular
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Activity Recordings
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Activity Recordings
Trailforks uses anonymized public activity data. ?
Personal Heatmap
Activity Types
all / none
Options
2
Date range month
Winter Trails
Warning A routing network for winter maps does not exist. Selecting trails using the winter trails layer has been disabled.
Missing Trails
Most Popular
Least Popular
Trails are colored based on popularity. The more popular a trail is, the more red. Less popular trails trend towards green.
Jump Magnitude Heatmap
Heatmap of where users jump on trails. Zoom in to see individual jumps, click circles to view jump details.
BC Backroad Status

Service Road Atlas is a free to use, community-driven service for viewing and creating reports on the numerous back-country service roads around B.C. and Alberta.

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Slope Aspect
Direction the slope faces
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        • By LynnerL MCBC
        • #17146 - 277 views
        Audience: region1
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