more stats
597 ft
Distance
-8 ft
Descent
00:00:34
Avg time
-9 ft
Altitude change
331 ft
Altitude min
340 ft
Altitude max
340 ft
Altitude start
331 ft
Altitude end
-1.5%
Grade
-4.6%
Grade max
358 ft
Distance down
203 ft
Distance flat
00:00:34
Avg time

Sudden Impact Details

  • Activities
    • Mountain Bike
    • E-Bike
    • Winter Fat Bike
    • Hike
    • Trail Running
    • Snowshoe
    • Nordic Ski
  • Riding Area
    Vietnam Trail Network
    Milford, Massachusetts
  • Difficulty Rating
  • Local Popularity
    100 in Mountain Biking [+]
    • 95 in E-Biking
    • 100 in Trail Running
    • 80 in Hiking
    • 95 in Snowshoeing
    • 100 in Nordic Skiing
    • 100 in Winter Fat Biking
  • Global Ranking
    #48753 in Mountain Biking [+]
    • #100937 in E-Biking
    • #88198 in Trail Running
    • #113886 in Hiking
    • #1755 in Snowshoeing
    • #9734 in Nordic Skiing
    • #1999 in Winter Fat Biking
  • State Ranking
    #653 in Mountain Biking · Massachusetts [+]
    • #315 in E-Biking
    • #2,365 in Trail Running
    • #4,350 in Hiking
    • #179 in Snowshoeing
    • #119 in Nordic Skiing
    • #21 in Winter Fat Biking
  • Trail Type
    Singletrack
  • Bike Type
    AM, XC, Fat
  • Direction
    Downhill Primary
  • Climb Difficulty
    Blue
  • Physical Rating
    Moderate
  • Family Friendly
    Yes
  • Dogs Allowed
    Yes
  • eBike Allowed
  • TTFs on Trail
    Berm, Rock Garden, Roller Coaster
  • Ride in Rain
    Yes
  • Land Owner

Sudden impact is one of the nicest new cross country style trails at Vietnam. Fun and flowy with some moderate tech in the form of rock roll-overs, one or two small drop-offs, it is a well defined Singletrack trail suitable for all skills levels, from novice to advanced depending on what speed you go. While it can be ridden in both directions, it is most fun as a down hill trail, starting on Holliston Highway, past Humpback on the right all the way down to where it joins Town Forest Trail. This trail is a must ride

Access Info

Sudden Impact has three access points. If you want to ride the whole trail as a down hill, you can access Sudden Impact from about the mid-point of Right turn Clyde. If you want to do it as an easy to moderate climb, you can start it from the bottom end on Town Forest Trail, between Optional Rocks and the Tonto turn-off. Otherwise you can enter the trail about mid-way, where it crosses over Holliston Highway.

Local Trail Association

Traditionally Indigenous Territory

Recent Activity on Trail

Past Week
  • 27 rides
  • 7 miles average
6 Months
  • 542 rides
  • 7 miles avg distance
All
  • 4,220 rides
  • Last: Nov 4, 2026
c1c2c3c4
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Status:
on Jun 21, 2026
Ideal
Avg: 3.99 (2 votes)
Your vote: 0

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      Directions to sudden-impact trailhead (42.176240, -71.487630)

      Photos

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      mtb
      83 |
      Aug 13, 2022 @ 6:21am
      Aug 13, 2022

      Videos

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      Frequently Asked Questions

      ▼ Where is Sudden Impact located?
      Sudden Impact is located in Vietnam Trail Network, Milford, Massachusetts, United States. It is part of the Vietnam Trail Network trail network. The trailhead is located at coordinates 42.17624, -71.48763.
      ▼ How hard is Sudden Impact?
      Sudden Impact is rated as Green difficulty. The physical rating is Moderate. The average grade is 1.5%. The climb difficulty is rated Blue.
      ▼ What is the elevation gain for Sudden Impact?
      The trail has 8 ft of elevation descent. The elevation ranges from 331 ft to 340 ft.
      ▼ Is Sudden Impact a point to point trail?
      Sudden Impact is not a point to point trail. The direction is Downhill Primary. The trail type is singletrack.
      ▼ How long is Sudden Impact?
      Sudden Impact is 597 ft long. The trail type is singletrack.
      ▼ Are dogs allowed on Sudden Impact?
      Yes, dogs are allowed on Sudden Impact. Please keep dogs on a leash where required and clean up after them.
      ▼ How do I access Sudden Impact? Where is the closest parking trailhead?
      The closest parking and trailhead locations to Sudden Impact are: View all parking locations in the area.
      ▼ How long does it take to ride Sudden Impact?
      Based on recorded activities, it takes an average of 1 minute to ride Sudden Impact. The trail is 597 ft long. Actual times will vary based on fitness level, conditions, and pace. View recent activity logs for more details.
      ▼ How busy is Sudden Impact?
      Sudden Impact is a very popular trail. There have been 10,485 recorded activities on this trail. The trail has received 15,830 check-ins. View recent activity on this trail.

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