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Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Snow Cover Inadequate
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
Trail Flow (Ridden Direction)
Trailforks scans users ridelogs 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 riders are riding a trail in its intended direction.
  • > 96%
  • > 90%
  • > 80%
  • > 70%
  • > 50%
  • < 50%
  • bi-directional trail
  • no data
Trail Last Ridden
Trailforks scans ridelogs 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 ridelogs 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 rides = more kinetic energy = warmer colors.
  • most popular
  • popular
  • less popular
  • not popular
ATV/ORV/OHV Filter
Max Vehicle Width
inches

Radar Time
x Activity Recordings
Trailforks users anonymized public ridelogs from the past 6 months.
  • mountain biking recent
  • mountain biking (>6 month)
  • hiking (1 year)
  • moto (1 year)
Activity Recordings
Trailforks users anonymized public skilogs from the past 12 months.
  • Downhill Ski
  • Backcountry Ski
  • Nordic Ski
Jump Magnitude Heatmap
Heatmap of where riders jump on trails. Zoom in to see individual jumps, click circles to view jump details.
Trails Deemphasized
Trails are shown in grey.
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      This is the home of mountain biking, which started on Mt. Tamalpais.
      Links
      Activities Click to view
      Region Details
      • 119
      • 7
      • 49
      • 95
      • 49
      • 3

      Local Trail Association

      Stats

      Avg Trail Rating
      Trails (view details)
      372
      Trails Mountain Bike
      326
      Trails E-Bike
      17
      Trails Hike
      364
      Trails Trail Running
      365
      Trails Horse
      18
      Total Distance
      525 miles
      Total Descent
      160,972 ft
      Total Vertical
      2,460 ft
      Highest Trailhead
      2,465 ft
      Reports
      2,825
      Photos
      785
      Ridden Counter
      65,514

      Popular Marin County Mountain Biking Trails

      statustitledifficultyrating
      B-17 Trail
      Tamarancho / West Marin / North Tam
      Endor (Flow Trail)
      Tamarancho / West Marin / North Tam
      Alchemist Trail
      Tamarancho / West Marin / North Tam
      Broken Dam Trail
      Tamarancho / West Marin / North Tam
      B-17 Extension
      Tamarancho / West Marin / North Tam
      Golden Gate Bridge (West)
      Sausalito
      Oak Ridge
      China Camp
      Wagon Wheel Trail
      Tamarancho / West Marin / North Tam
      Serpentine Trail
      Tamarancho / West Marin / North Tam
      Bay View Trail
      China Camp
      Goldman Trail
      Tamarancho / West Marin / North Tam
      Battery East Road
      Sausalito
      Echo
      China Camp
      Upper Porcupine Trail
      Tamarancho / West Marin / North Tam
      Golden Gate Bridge (East)
      Sausalito

      Marin County Mountain Bike Routes

      titleratingdistance
      Tamarancho Maiden Ride
      Tamarancho / West Marin / North Tam
      14 miles
      Tamarancho Loop
      Tamarancho / West Marin / North Tam
      7 miles
      Mt Tam Rounder
      Mt Tam
      21 miles
      Mt Tam Round the Dell
      Mt Tam
      26 miles
      Tam Olema Geronimo Loop - E Ridgecrest Gravity Car Out & Back
      Fairfax
      42 miles
      Mt Tam Rounder
      Mt Tam
      23 miles
      China Camp dark
      China Camp
      13 miles
      Chicken Shack Loma Alta Queenstone Loop
      Big Rock / Novato
      33 miles
      Mt Tam Southern Face Loop
      Mt Tam
      19 miles
      Marin Headlands Ride From Rodeo
      Sausalito
      7 miles

      Recent Ridelog Activity in Region

      Today
      • 74 rides
      Yesterday
      • 61 rides
      Past Week
      • 805 rides

      Photos of Marin County Mountain Bike

      4 |
      Nov 17, 2021 @ 9:33am
      Nov 17, 2021
      519 |
      Feb 14, 2018 @ 11:22pm
      Feb 14, 2018
      706 |
      May 4, 2016 @ 12:11am
      May 4, 2016
      620 |
      Jun 23, 2015 @ 10:36pm
      Jun 23, 2015
      566 |
      Feb 16, 2015 @ 9:09pm
      Feb 16, 2015
      472 |
      Feb 16, 2015 @ 9:07pm
      Feb 16, 2015
      1,326 |
      Feb 6, 2015 @ 9:41am
      Feb 6, 2015
      | 5 comments
      766 |
      Feb 6, 2015 @ 9:39am
      Feb 6, 2015

      Videos of Marin County Mountain Bike

      The Rock
      16 | Nov 18, 2021
      Octopus Trail
      1:00 | 51 | Oct 15, 2020
      Riding Boulder Spring Trail
      2:34 | 54 | Oct 9, 2020
      Good time at Camp Tamarancho
      0:08 | 310 | Feb 12, 2018
      Big Rock
      0:09 | 184 | Sep 27, 2017
      Chameleon Maiden Voyage
      0:03 | 201 | Sep 10, 2017
      Crevice of Doom
      0:08 | 882 | Sep 10, 2017
      Tam
      trail: Tenderfoot
      0:06 | 275 | Aug 9, 2017

      Current Trail Warnings

      statustraildateconditionuserinfo
      Gravity Zone
      Stafford Lake Bike Park
      Nov 29, 2021 @ 9:09am
      2 days
      Unknowndhtahoe2010The entire park is in rough shape. Jump...
      Shafter Grade
      Tamarancho / West Marin / North Tam
      Nov 28, 2021 @ 7:46am
      3 days
      Idealchriscrisp

      Recent Trail Reports

      Activity Feed

      usernameactiontypetitledate
      user #766264andyman09wishlisttrailSerpentine Trail
      Nov 30, 2021 @ 10:41pm
      18 mins
      user #1157608bkxcdifficultyvotetrailCoastal Trail (Cardiac Hill Segment)
      Nov 30, 2021 @ 5:07pm
      6 hours
      user #2917316TigrtheshredderriddentrailTerra Linda Ridge Fire Road and 3 more
      Nov 29, 2021 @ 7:36pm
      1 day
      user #2917316TigrtheshredderaddreportPonti Ridge Trail
      Nov 29, 2021 @ 7:35pm
      1 day
      user #2917316TigrtheshredderriddentrailPonti Ridge Trail
      Nov 29, 2021 @ 7:34pm
      1 day

      Recent Comments

      usernametypetitlecommentdate
      user #2739789maximumgtrailEndor (Flow Trail)right on. I'll try this next time.
      Nov 19, 2021 @ 12:34pm
      Nov 19, 2021
      user #801820SpindelatrontrailEndor (Flow Trail)about 20min from the trailhead if you go this...
      Nov 19, 2021 @ 12:20pm
      Nov 19, 2021
      user #2739789maximumgtrailEndor (Flow Trail)All that cranking up pretty boring...
      Nov 16, 2021 @ 8:42pm
      Nov 16, 2021
      user #2879875AFsellierMtbtrailWorn Springs Fire RoadIf you head up the fire road from oak in San...
      Nov 15, 2021 @ 11:41am
      Nov 15, 2021
      user #2879875AFsellierMtbtrailLagunitas TrailThere’s two trails that don’t have any...
      Nov 8, 2021 @ 1:11pm
      Nov 8, 2021

      Local Badges


      Activity Type Stats

      activitytypetrailsdistancedescentdescent distancetotal verticalratingglobal rankstate rankphotosreportsroutesridelogs
      Mountain Bike326447 miles145,751 ft230 miles2,461 ft
      7882,8234988,537
      E-Bike1719 miles2,710 ft7 miles955 ft
      2,463103,364
      Hike364520 miles158,035 ft261 miles2,461 ft
      2,79593,918
      Trail Running365521 miles158,471 ft262 miles2,461 ft
      2,79561,386
      Horse1816 miles4,452 ft8 miles1,401 ft
      8092
      • By canadaka Trailforks & contributors
      • Admins: CAMTB, ericfoltz, Redhawk, jpmcghee, brianpetry, A4B, MCBC
      • #4331 - 21,163 views

      Downloading of trail gps tracks in kml & gpx formats is enabled for Marin County.
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