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Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
Trail 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%
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
ContributeDetails
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

LEGEND
Trail Difficulties
  • Access Road/Trail
  • White
  • Green
  • Blue
  • Black
  • Double Black Diamond

Trail Report Status
  • Clear / Green
  • Minor Issue / Yellow
  • Significant Issue / Amber
  • Closed

  • Land Owner Overlay
  • Wilderness (typically no bikes in USA)
  • BLM (public)
  • USFS (Wildlife sanctuaries darker than usfs)
  • State land
  • Indigenous
  • Military
Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
  • Map Markers
  • trail Trail Head
  • photo Photo
  • place Directory Listing
  • region Riding Area
  • TTF TTF
  • Parking Parking
  • Viewpoint Viewpoint
  • Information Information
  • Warning Warning
  • Directions Directions
  • Sight Sight
  • Restrooms Restrooms
  • eBike Charging Point eBike Charging Point
  • Water Fountain/Source Water Fountain/Source
  • Gate Gate
  • Trail Sign Trail Sign
  • Table or Bench Table or Bench
  • Ladder Ladder
  • Stairs Stairs
  • Bridge Bridge
  • Camping Camping
  • Cabin Cabin
  • Lodge Lodge
  • Bear Cache Bear Cache
  • Dock Dock
  • Ranger Station Ranger Station
  • Summit Summit
  • Other Other
      This is the home of mountain biking, which started on Mt. Tamalpais.
      Links
      Region Details
      • 86
      • 7
      • 50
      • 89
      • 50
      • 3

      Region Status
      Open as of 13 hours
      Local Trail Association

      Stats

      Avg Trail Rating
      Trails (view details)
      337
      Trails Mountain Bike
      287
      Trails E-Bike
      9
      Trails Hike
      327
      Trails Trail Running
      328
      Trails Horse
      9
      Total Distance
      479 miles
      Total Descent
      151,015 ft
      Total Vertical
      2,460 ft
      Highest Trailhead
      2,465 ft
      Reports
      1,586
      Photos
      618
      Ridden Counter
      34,812

      Popular Marin County Mountain Biking Trails

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

      Recent Ridelog Activity in Region

      Today
      • 116 rides
      • 20 miles avg distance
      Yesterday
      • 82 rides
      • 16 miles avg distance
      Past Week
      • 776 rides
      • 17 miles avg distance

      Photos of Marin County Mountain Bike

      215 |
      Feb 14, 2018 @ 11:22pm
      Feb 14, 2018
      360 |
      Jun 23, 2015 @ 10:36pm
      Jun 23, 2015
      956 |
      Feb 6, 2015 @ 9:41am
      Feb 6, 2015
      | 4 comments
      544 |
      Feb 6, 2015 @ 9:39am
      Feb 6, 2015

      Videos of Marin County Mountain Bike

      Good time at Camp Tamarancho
      0:08 | 229 | Feb 12, 2018
      Big Rock
      0:09 | 126 | Sep 27, 2017
      Chameleon Maiden Voyage
      0:03 | 157 | Sep 10, 2017
      Crevice of Doom
      0:08 | 836 | Sep 10, 2017

      Current Trail Warnings

      statustraildateconditionuserinfo
      Dead Heifer Road
      Tamarancho / West Marin / North Tam
      Sep 5, 2020 @ 12:37pm
      Sep 5, 2020
      Very Drydanielreese17Trail forks has its route it backwards at...
      Coastal Trail (to Hill 88)
      Marin Headlands
      Sep 2, 2020 @ 4:29pm
      Sep 2, 2020
      Idealewilliammostly un-bikeable

      Recent Trail Reports

      Activity Feed

      usernameactiontypetitledate
      user #1480633SnawbaryriddentrailBill's Trail
      Sep 26, 2020 @ 11:57pm
      52 sec
      user #1472644TonymosaaddreportMarshall Beach Road
      Sep 26, 2020 @ 11:25pm
      33 mins
      user #2376287phigbywishlisttrailShoreline Trail
      Sep 26, 2020 @ 11:23pm
      35 mins
      user #2421272Fjr17riddentrailBay View Trail and 2 more
      Sep 26, 2020 @ 2:13pm
      10 hours
      user #2144257MillerwilladdreportBill's Trail
      Sep 26, 2020 @ 1:33pm
      10 hours

      Recent Comments

      usernametypetitlecommentdate
      user #2211973kchristo94trailBlue Ridge Fire RoadSuper steep in the uphill direction. Have to...
      Sep 20, 2020 @ 7:16am
      Sep 20, 2020
      user #1023843asmtbreportDead Heifer RoadIts supposed to be a climb
      Sep 18, 2020 @ 4:58pm
      Sep 18, 2020
      user #1975146ewilliamtrailCoastal Trail (to Hill 88)this is not a bike trail. expect to hike and...
      Sep 2, 2020 @ 4:29pm
      Sep 2, 2020
      user #1866691BlairWitch1trailAlchemist Trailthanks for changing this to blue
      Aug 29, 2020 @ 9:24am
      Aug 29, 2020
      user #1866691BlairWitch1trailParanickel (Hunt Camp)is this trail really a black? or could it be a...
      Aug 25, 2020 @ 9:17am
      Aug 25, 2020

      Local Badges

      • By canadakaTrailforks Pro Subscriber Trailforks Plus & contributors
      • Admins: CAMTB, ericfoltz, jpmcghee, brianpetry, A4B, MCBC
      • #4331 - 13,355 views

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