more stats
518 ft
Distance
15 ft
Climb
-7 ft
Descent
00:07:19
Avg time
10 ft
Altitude change
449 ft
Altitude min
468 ft
Altitude max
457 ft
Altitude start
469 ft
Altitude end
2%
Grade
-10.2%
Grade max
14.1%
Grade min
226 ft
Distance climb
112 ft
Distance down
167 ft
Distance flat
00:07:19
Avg time

Mostly Harmful Details

  • Activities
    • Mountain Bike
  • Riding Area
    Sawmill Hills
    Northampton, Massachusetts
  • Difficulty Rating
    Double Black Diamond Rate
  • Local Popularity
    35 in Mountain Biking
  • Global Ranking
    #284219 in Mountain Biking
  • State Ranking
    #9,086 in Mountain Biking · Massachusetts
  • Trail Type
    Singletrack
  • Bike Type
    AM
  • Direction
    Downhill Only
    Popular In Reverse
  • Trail Visibility
    Always easy to follow
  • Dogs Allowed
    Yes
  • eBike Allowed
    No
  • TTFs on Trail
    Rock Face
  • Year Opened
    2021

Technical A-Line down a steep rock face into a rock berm.

Tags
BermsRock slabs

Local Trail Association

Traditionally Indigenous Territory

Recent Activity on Trail

Past Week
  • 0 rides
  •  
6 Months
  • 3 rides
  • 9 miles avg distance
All
  • 36 rides
  • Last: Jun 12, 2026
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Mostly Harmful Trail Reports

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      Directions to mostly-harmful trailhead (42.321340, -72.702410)
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      Routes with this trail

      11
      Chartpack white down 22
      6 miles • 719 ft • 8 •
      This avoids the cutting in Sawmill as of Spring 22.
      10
      Group Loop
      6 miles • 787 ft • 7 •
      A good basic loop that from Chartpak. Mostly Harmful is optional.
      10
      Seven Miles from Chartpak
      7 miles • 861 ft • 8 •
      This route is seven miles long and mostly single track.

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      Nearby Trails

      Sawmill Hills

      • By samveggTF Pro WMass NEMBA & contributors
      • #435780 - 618 views

      Frequently Asked Questions

      ▼ Where is Mostly Harmful located?
      Mostly Harmful is located in Sawmill Hills, Northampton, Massachusetts, United States. It is part of the Sawmill Hills trail network. The trailhead is located at coordinates 42.32134, -72.70241.
      ▼ How hard is Mostly Harmful?
      Mostly Harmful is rated as Double Black Diamond difficulty. The average grade is 2%.
      ▼ What is the elevation gain for Mostly Harmful?
      Mostly Harmful has 15 ft of elevation gain. The trail has 7 ft of elevation descent. The elevation ranges from 449 ft to 468 ft.
      ▼ Is Mostly Harmful a point to point trail?
      Yes, Mostly Harmful is a point to point trail. The direction is Downhill Only. The trail type is singletrack.
      ▼ How long is Mostly Harmful?
      Mostly Harmful is 518 ft long. The trail type is singletrack.
      ▼ Are dogs allowed on Mostly Harmful?
      Yes, dogs are allowed on Mostly Harmful. Please keep dogs on a leash where required and clean up after them.
      ▼ When is the best time of year to ride Mostly Harmful?
      Based on activity log data, the most popular months to ride Mostly Harmful are:
      • September (9 activities)
      • June (4 activities)
      • May (3 activities)
      Check the reports page for current trail conditions.
      ▼ How do I access Mostly Harmful? Where is the closest parking trailhead?
      The closest parking and trailhead locations to Mostly Harmful are: View all parking locations in the area.
      ▼ How long does it take to ride Mostly Harmful?
      Based on recorded activities, it takes an average of 7 minutes to ride Mostly Harmful. The trail is 518 ft long. Actual times will vary based on fitness level, conditions, and pace. View recent activity logs for more details.
      ▼ How busy is Mostly Harmful?
      Mostly Harmful is a less popular trail with lighter traffic. There have been 75 recorded activities on this trail. The trail has received 126 check-ins. View recent activity on this trail.

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