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597 ft
Distance
-8 ft
Descent
00:00:46
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
00:00:46
Avg time
Sudden Impact Details
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Activities
- Mountain Bike
- E-Bike
- Winter Fat Bike
- Hike
- Trail Running
- Snowshoe
- Nordic Ski
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Riding AreaVietnam Trail Network
Milford, Massachusetts -
Difficulty Rating
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Local Popularity100 in Mountain Biking [+]
- 100 in E-Biking
- 100 in Trail Running
- 100 in Hiking
- 5 in Snowshoeing
- 5 in Nordic Skiing
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Global Ranking
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Trail TypeSingletrack
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Bike TypeAM, XC, Fat
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DirectionDownhill Primary
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Climb DifficultyBlue
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Physical RatingModerate
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Family FriendlyYes
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Dogs AllowedYes
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eBike Allowed
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TTFs on TrailBerm, Rock Garden, Roller Coaster
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Ride in RainYes
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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
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Please consider joining or donating to the local trail association to supportDonate to earn trail karma!
trail development & maintenance.
Traditionally Indigenous Territory
Recent Activity on Trail
Past Week
- 16 rides
- 7 miles average
6 Months
- 332 rides
- 7 miles avg distance
All
- 3,899 rides
- Last: Jul 12, 2026
| c1 | c2 | c3 | c4 |
|---|---|---|---|
January | February | March | April |
May | June | July | August |
September | October | November | December |
Sudden Impact Trail Reports
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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)
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The colour categories are based on what percentage of riders are riding a trail in its intended direction.
The colour categories are based on what percentage of riders are riding a trail in its intended direction.
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- > 90%
- > 80%
- > 70%
- > 50%
- < 50%
- bi-directional trail
- no data
Trail Last Ridden
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- < 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
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Trail Popularity ?
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Trails are compared with nearby trails in the same city region with a possible 25 colour shades.
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Trails are colored based on popularity. The more popular a trail is, the more red. Less popular trails trend towards green.
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Directions to sudden-impact trailhead
(42.176240, -71.487630)
Videos
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Routes with this trail
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Nearby Trails
- Campfire Trail 89 ft
- Si Connector 89 ft
- Humpback Rock 413 ft
- Town Forest Trail 702 ft
- Sneaky Quickie 709 ft
Vietnam Trail Network
- By WillieJacobsz
Trailforks SBP SWW & contributors - #126042 - 1,244 views
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Frequently Asked Questions About Sudden Impact
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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.
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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.
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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.
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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.
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