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Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Snow Cover Partial
  • 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
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US Cell Coverage
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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
  • Snowmobile
Winter Trails
Warning A routing network for winter maps does not exist. Selecting trails using the winter trails layer has been disabled.
x 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 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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      No description for Portola Valley has been added yet! Login or register to submit one.
      Activities Click to view
      Region Details
      • 2
      • 13
      • 1

      Region Status
      Caution as of Mar 22, 2024

      Stats

      Avg Trail Rating
      State Ranking
      #6,060
      Trails (view details)
      24
      Trails Mountain Bike
      16
      Trails E-Bike
      2
      Trails Horse
      4
      Trails Hike
      29
      Trails Trail Running
      29
      Total Distance
      25 miles
      Total Descent Distance
      10 miles
      Total Descent
      4,124 ft
      Total Vertical
      1,684 ft
      Highest Trailhead
      2,044 ft
      Reports
      12
      Photos
      1
      Ridden Counter
      1,082
      Sub Regions

      Photos of Portola Valley Mountain Bike

      13 |
      Jun 27, 2023 @ 11:54am
      Jun 27, 2023

      Recent Trail Reports

      statustraildateconditioninfouser
      Washing Machine
      Aug 11, 2023 @ 11:16pm
      Aug 11, 2023
      VariableOvergrownTrailRider662636
      Betsy Crowder Trail
      Jun 19, 2023 @ 2:29am
      Jun 19, 2023
      DryTrail Running tamarancho-report A4B
      Audobon Frontage
      Dec 12, 2021 @ 10:44am
      Dec 12, 2021
      Unknownhendrik42

      Activity Feed

      usernameactiontypetitledate
      winkeylessaddrouteactivity #50049677
      Mar 15, 2024 @ 3:45pm
      Mar 15, 2024
      lszeslC7wishlisttrailactivity #48342930 and 1 more
      Jan 18, 2024 @ 6:14pm
      Jan 18, 2024
      TommyXimingdDyUkBwishlistskillparkactivity #46661603
      Nov 25, 2023 @ 10:22am
      Nov 25, 2023
      mattgrajedawishlistskillparkactivity #41460831
      Jul 2, 2023 @ 10:03pm
      Jul 2, 2023
      mountainracerwishlistskillparkactivity #41319327
      Jun 27, 2023 @ 11:37pm
      Jun 27, 2023

      Recent Comments

      usernametypetitlecommentdate
      TrailRider662636trailWashing MachineNope! Just climb over the fence and ride!...
      May 3, 2023 @ 8:31pm
      May 3, 2023
      KidklaykotrailWashing MachineGone Forever
      Jun 8, 2022 @ 4:23pm
      Jun 8, 2022
      Alvaro2345trailWashing MachineDid I mention this is the best part of Alpine?
      Oct 3, 2021 @ 11:55am
      Oct 3, 2021
      Alvaro2345trailWashing MachineBest part of Alpine. Don't skip it.
      Oct 3, 2021 @ 11:55am
      Oct 3, 2021
      Alvaro2345trailWashing MachineBest part of Alpine. Don't skip it.
      Oct 3, 2021 @ 11:54am
      Oct 3, 2021

      Local Badges

      Bike & Skill Parks

      nametypecityrating
      Ladera Dirt Jump Parkskill parkPortola Valley

      Activity Type Stats

      activitytypetrailsdistancedescentdescent distancetotal verticalratingglobal rankstate rankphotosreportsroutesridelogs
      Mountain Bike1615 miles2,320 ft6 miles1,683 ft
      #6,06011221,444
      E-Bike22 miles197 ft4,888 ft295 ft
      10198
      Horse45 miles472 ft1 mile1,407 ft
      Hike2925 miles4,124 ft10 miles1,683 ft
      12389
      Trail Running2925 miles4,124 ft10 miles1,683 ft
      1295
      • By Deandonat1004 & contributors
      • Admins: spokesmanmtb, CMB
      • #40579 - 1,025 views

      Downloading of trail gps tracks in kml & gpx formats is enabled for Portola Valley.
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