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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
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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
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x Missing Trails
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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.
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      The Greylock Glen area covers 1,000 acres in the shadow of Mount Greylock, which overlooks the scenic Berkshire County town of Adams. This area is in the process of being developed by the town and the Commonwealth in partnership with the Thunderbolt Ski Runners as a model for outdoor recreation, environmental conservation, and education. The new development of this area will include hiking and other pedestrian trails, downhill backcountry skiing (including the historic Thunderbolt Ski Trail), single-track mountain biking and running trails, cross-country skiing trails, and snowmobile connections. https://www.thunderboltski.com/membership-payment
      Primary Trail Type: Cross-Country
      Shuttleable: YES
      Land Status: State Park
      Parking google parking directions
      Links
      Region Supporters & Maintainers
      Activities Click to view
      Region Details
      • 1
      • 12
      • 14
      • 4

      Region Status
      Open as of May 2, 2024
      Local Trail Association

      Stats

      Avg Trail Rating
      Trails (view details)
      39
      Trails Mountain Bike
      32
      Trails Hike
      42
      Trails Trail Running
      39
      Trails Snowmobile
      1
      Trails Snowshoe
      15
      Trails Downhill Ski
      1
      Trails Backcountry Ski
      13
      Trails Nordic Ski
      9
      Total Distance
      30 miles
      Total Descent Distance
      17 miles
      Total Descent
      10,028 ft
      Total Vertical
      2,046 ft
      Highest Trailhead
      3,162 ft
      Reports
      153
      Photos
      11
      Ridden Counter
      2,696

      Photos of Greylock Glen Multi-Use Trail System Mountain Bike

      83 |
      Mar 25, 2021 @ 7:21pm
      Mar 25, 2021
      57 |
      Mar 25, 2021 @ 7:19pm
      Mar 25, 2021
      trail: Moonwart
      117 |
      Oct 24, 2020 @ 5:07am
      Oct 24, 2020
      82 |
      May 23, 2020 @ 6:22am
      May 23, 2020
      207 |
      Oct 26, 2018 @ 9:48am
      Oct 26, 2018
      trail: Moonwart
      133 |
      Jul 9, 2018 @ 4:45am
      Jul 9, 2018
      trail: Moonwart
      132 |
      Jul 9, 2018 @ 4:44am
      Jul 9, 2018
      trail: Moonwart
      135 |
      Jul 9, 2018 @ 4:44am
      Jul 9, 2018

      Videos of Greylock Glen Multi-Use Trail System Mountain Bike

      Hemlock Hollow
      2:11 | 340 | Sep 9, 2021 , Adams
      The Greylock Glen - Southside Mt Bike Trails
      9:45 | 405 | Aug 23, 2021 , Adams
      Greylock Glen Trails - Wolftree
      4:40 | 328 | Apr 11, 2021 , Adams
      Greylock Glen Trails - Moonwart
      trail: Moonwart
      2:46 | 396 | Apr 11, 2021 , Adams
      Greylock Glen Trails - Dragon Tail
      3:34 | 294 | Apr 11, 2021 , Adams
      Greylock Glen Mountain Bike Trails
      trail: Moonwart
      4:13 | 501 | Apr 4, 2021 , Adams

      Recent Trail Reports

      Activity Feed

      usernameactiontypetitledate
      brett_cookcommenttrailactivity #54414997
      Jun 20, 2024 @ 4:33am
      Jun 20, 2024
      brett_cookcommenttrailactivity #53139309 and 1 more
      May 25, 2024 @ 5:59pm
      May 25, 2024
      Mattxyn6T2wishlisttrailactivity #52051995
      May 3, 2024 @ 5:29pm
      May 3, 2024
      Cknowlesmaineaddreportactivity #51983973
      May 2, 2024 @ 8:07am
      May 2, 2024
      Cknowlesmaineaddreportactivity #51416565
      Apr 19, 2024 @ 6:40pm
      Apr 19, 2024

      Recent Comments

      usernametypetitlecommentdate
      brett_cooktrailCheshire Harbor TrailCame down this 6/19/24. Trail was dry and free...
      Jun 20, 2024 @ 4:33am
      Jun 20, 2024
      brett_cooktrailWest Mountain RoadDecent trail to bring you from Cheshire Harbot...
      May 25, 2024 @ 6:01pm
      May 25, 2024
      brett_cooktrailOld Adams Rd.Great ride coming from Jones' Nose. Few fun...
      May 25, 2024 @ 5:59pm
      May 25, 2024
      koshonetrailHemlock HollowThe Hemlock Hollow loop is a wonderful...
      Sep 27, 2023 @ 7:58am
      Sep 27, 2023
      nmerksamertrailBellows Pipe TrailThe top 2/3 of this trail is surprisingly...
      Jul 11, 2022 @ 7:03pm
      Jul 11, 2022

      Local Badges


      Activity Type Stats

      activitytypetrailsdistancedescentdescent distancetotal verticalratingglobal rankstate rankphotosreportsroutesridelogs
      Mountain Bike3224 miles5,968 ft12 miles1,952 ft
      #4,925#2,1961115212,097
      Hike4230 miles10,026 ft17 miles2,047 ft
      #4,040#2,0191521462
      Trail Running3929 miles8,809 ft16 miles2,047 ft
      #4,063#2,025152156
      Snowmobile12,073 ft259 ft
      1
      Snowshoe158 miles4,321 ft6 miles2,001 ft
      15
      Downhill Ski1
      #981220
      Backcountry Ski134 miles2,103 ft3 miles1,946 ft
      #102#611173
      Nordic Ski94 miles659 ft2 miles623 ft
      #301#190115
      • By aamcgee BERK NEMBA & contributors
      • Admins: BERK NEMBA, BikeBerkshires, Thunderbolt, BERK NEMBA
      • #20250 - 7,733 views
      • greylock glen multi-use trail system activity log | embed map of Greylock Glen Multi-Use Trail System mountain bike trails | greylock glen multi-use trail system mountain biking points of interest

      Downloading of trail gps tracks in kml & gpx formats is enabled for Greylock Glen Multi-Use Trail System.
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