more stats
3,252 ft
Distance
31 ft
Climb
-384 ft
Descent
00:02:43
Avg time
-353 ft
Altitude change
9,723 ft
Altitude min
10,076 ft
Altitude max
10,076 ft
Altitude start
9,723 ft
Altitude end
-10.854%
Grade
-31.216%
Grade max
20.677%
Grade min
325 ft
Distance climb
2,775 ft
Distance down
153 ft
Distance flat
00:02:43
Avg time

Dirty Dozen Details

  • Activities
    • Mountain Bike
    • Hike
    • Trail Running
  • Riding Area
    Fraser Valley
    Winter Park, Colorado
  • Difficulty Rating
    Black Diamond Rate
  • Voted Difficulty
    Black Diamond (1 vote)
  • Local Popularity
    90 in Mountain Biking [+]
    • 5 in Trail Running
    • 5 in Hiking
  • Global Ranking
    #37438 in Mountain Biking [+]
    • #297548 in Trail Running
    • #313987 in Hiking
  • Trail Type
    Singletrack
  • Direction
    Downhill Only
    Popular Direction Shown
  • Dogs Allowed
    Yes

No community description for Dirty Dozen trail has been added yet!

AI Generated Description

Dirty Dozen is a highly rated 3,252 ft popular black diamond difficulty singletrack trail located near Winter Park Colorado. This mountain bike primary trail can be used downhill only. On average it takes 2 minutes to complete this trail.

Trail Supporters

  • USFS
    Land Manager
Local Trail Association
Traditionally Indigenous Territory

Recent Activity on Trail

Past Week
  • 7 rides
  • 26 miles average
6 Months
  • 84 rides
  • 30 miles avg distance
All
  • 523 rides
  • Last: Sep 8, 2026
c1c2c3c4
January
February
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April
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Status:
on Jun 24, 2026
Dry
Avg: 4 (17 votes)
Your vote: 0

view (6,439)
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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 activity logs 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 users are riding a trail in its intended direction.
  • > 96%
  • > 90%
  • > 80%
  • > 70%
  • > 50%
  • < 50%
  • bi-directional trail
  • no data
Trail Last Used
Trailforks scans activity logs 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 activity logs 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 activities = more kinetic energy = warmer colors.
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  • popular
  • less popular
  • not popular
ATV/ORV/OHV Filter
Max Vehicle Width
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Activity Recordings
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Activity Recordings
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Winter Trails
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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.
Jump Magnitude Heatmap
Heatmap of where users jump on trails. Zoom in to see individual jumps, click circles to view jump details.
BC Backroad Status

Service Road Atlas is a free to use, community-driven service for viewing and creating reports on the numerous back-country service roads around B.C. and Alberta.

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Slope Aspect
Direction the slope faces
Flat N NE E SE S SW W NW
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        Directions to dirty-dozen trailhead (39.881461, -105.784556)
        View on Discover Map

        Photos

        No photos have been added for Dirty Dozen yet, add a photo.

        Videos

        3 more »
        ANOTHER TRESTLE FULL PULL - JUMPS TO TECH -...
        mtb
        9:05 | 248 | Jan 18, 2024 , Winter Park
        youtuber I'm ALMOST as good as The Singletrack Sampler...
        mtb
        12:07 | 665 | Dec 10, 2019 , Winter Park
        Rock gap crash
        mtb
        0:24 | 105 | Jul 28, 2022 , Winter Park

        Routes with this trail

        161
        Trestle Gravity Team Enduro Day
        28 miles • 8,049 ft • 20 • Loop •
        A great day on and off the resort to test your hands and your legs all day!!
        Big Mountain Enduro - Winter Park 2019 Archived
        12 miles • 3,220 ft • 21 • Race •
        The BME returns to Winter Park after a 2-year hiatus. This ever-popular event will blend high altitude...
        2019 USAC Nationals Enduro Course Archived
        19 miles • 3,129 ft • 33 • Race •
        THIS IS NOT A PERFECT COURSE!! I put it together to see how much climbing there would be for the enduro....
        4.1 ★★★★★
        17 Ratings
        5 ★ 35%
        4 ★ 41%
        3 ★ 18%
        2 ★ 6%
        1 ★

        2 Reviews & Comments

        BasedGawd BasedGawd
        fun real tech! It's a tire eater if you're only used to manicured flow.

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        Nearby Trails

        Fraser Valley

        • By toddTF Pro Trailforks & contributors
        • #138293 - 1,389 views

        Frequently Asked Questions

        ▼ Where is Dirty Dozen located?
        Dirty Dozen is located in Fraser Valley, Winter Park, Colorado, United States. It is part of the Fraser Valley trail network. The trailhead is located at coordinates 39.88146, -105.78456.
        ▼ How hard is Dirty Dozen?
        Dirty Dozen is rated as Black Diamond difficulty. The average grade is 10.854%.
        ▼ What is the elevation gain for Dirty Dozen?
        Dirty Dozen has 31 ft of elevation gain. The trail has 384 ft of elevation descent. The elevation ranges from 9,723 ft to 10,076 ft.
        ▼ Is Dirty Dozen a point to point trail?
        Yes, Dirty Dozen is a point to point trail. The direction is Downhill Only. The trail type is singletrack.
        ▼ How long is Dirty Dozen?
        Dirty Dozen is 3,252 ft long. The trail type is singletrack.
        ▼ Are dogs allowed on Dirty Dozen?
        Yes, dogs are allowed on Dirty Dozen. Please keep dogs on a leash where required and clean up after them.
        ▼ How do I access Dirty Dozen? Where is the closest parking trailhead?
        The closest parking and trailhead locations to Dirty Dozen are: View all parking locations in the area.
        ▼ How long does it take to ride Dirty Dozen?
        Based on recorded activities, it takes an average of 3 minutes to ride Dirty Dozen. The trail is 3,252 ft long. Actual times will vary based on fitness level, conditions, and pace. View recent activity logs for more details.
        ▼ How busy is Dirty Dozen?
        Dirty Dozen is a very popular trail. There have been 5,581 recorded activities on this trail. The trail has received 6,439 check-ins. View recent activity on this trail.

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