more stats
1,939 ft
Distance
100 ft
Climb
-78 ft
Descent
00:06:06
Avg time
22 ft
Altitude change
523 ft
Altitude min
615 ft
Altitude max
594 ft
Altitude start
615 ft
Altitude end
1.115%
Grade
-18.271%
Grade max
41.064%
Grade min
518 ft
Distance climb
907 ft
Distance down
514 ft
Distance flat
00:06:06
Avg time

Under World Details

  • Activities
    • Mountain Bike
    • Hike
    • Trail Running
  • Riding Area
    Jackson Demonstration State Forest
    Mendocino, California
  • Difficulty Rating
    Blue Rate
  • Local Popularity
    55 in Mountain Biking [+]
    • 5 in Trail Running
    • 70 in Hiking
  • Global Ranking
    #100064 in Mountain Biking [+]
    • #306526 in Trail Running
    • #58051 in Hiking
  • Trail Type
    Singletrack
  • Bike Type
    AM
  • Direction
    Both Directions
    Popular In Reverse
  • Climb Difficulty
    Blue
  • Physical Rating
    Moderate
  • Dogs Allowed
    Yes
  • eBike Allowed
    No
  • Land Owner
    Jackson Demonstration State Forest

No community description for Under World trail has been added yet!

AI Generated Description

Under World is a 1,939 ft moderately popular blue difficulty singletrack trail located near Mendocino California. This mountain bike primary trail can be used both directions and has a moderate overall physical rating with a 100 ft blue climb. On average it takes 6 minutes to complete this trail.

Local Trail Association
Traditionally Indigenous Territory

Recent Activity on Trail

Past Week
  • 2 rides
  • 14 miles average
6 Months
  • 9 rides
  • 14 miles avg distance
All
  • 88 rides
  • Last: Aug 22, 2026
c1c2c3c4
January
February
March
April
May
June
July
August
September
October
November
December
update trails status or condition

Under World Trail Reports

statusdatedescription
Jun 9, 2025 @ 10:47am
Jun 9, 2025
 Should have stuck to parallel
Nov 24, 2017 @ 8:03am
Nov 24, 2017
 This was just before the rain, but the trails were in excellent shape.
Nov 14, 2017 @ 9:38am
Nov 14, 2017
May 1, 2017 @ 2:06pm
May 1, 2017
 reporter
more »
Status:
on Jun 9, 2025
Variable
Avg: 3.86 (2 votes)
Your vote: 0

view (265)
close
  • Basemap  Map 
    • Pro
    • Pro
    • Pro
    • Pro
    • Pro
    • Pro
3D
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 Ridden
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.
  • most popular
  • popular
  • less popular
  • not popular
ATV/ORV/OHV Filter
Max Vehicle Width
inches
US Cell Coverage
Legend
cell carrier legend

Radar Time
Activity Recordings
Trailforks uses anonymized public activity data. ?
Activity Recordings
Trailforks uses anonymized public activity data. ?
Winter Trails
Warning A routing network for winter maps does not exist. Selecting trails using the winter trails layer has been disabled.
Missing Trails
Most Popular
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 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.

map legend
Slope Aspect
Direction the slope faces
Flat N NE E SE S SW W NW
Trails Deemphasized
Trails are shown in grey.
disable
Only show trails with no bike usage.
Enable
Suggested Layers
Based on selected activity type

    Save the current map location and zoom level as your default home location whenever this page is loaded.

    Save
        Directions to under-world trailhead (39.335310, -123.756378)
        View on Discover Map

        Photos

        1 more »
        mtb
        64 |
        Jan 6, 2023 @ 11:55pm
        Jan 6, 2023

        Videos

        no videos have been added for Under World yet, add a video.

        Routes with this trail

        148
        Mendo Testo
        ★ 5.0 • 26 miles • 4,331 ft • 26 •
        This is a route loosely based off of a prior enduro.
        68
        Mendo Sampler Day 1
        ★ 4.0 • 24 miles • 3,684 ft • 17 •
        Testing this rotue based loosely on enduro?
        3.5 ★★★★★
        2 Ratings
        5 ★ 50%
        4 ★
        3 ★
        2 ★ 50%
        1 ★

        1 Review & Comments


        We hope you've been enjoying Trailforks!

        Create a FREE account to view trail comments and much more.

        Create a Free Account

        Nearby Trails

        Jackson Demonstration State Forest

        • By JackCoulTF Pro & contributors
        • #70743 - 868 views

        Frequently Asked Questions About Under World

        ▼ Where is Under World located?
        Under World is located in Jackson Demonstration State Forest, Mendocino, California, United States. It is part of the Jackson Demonstration State Forest trail network. The trailhead is located at coordinates 39.33531, -123.75638.
        ▼ How hard is Under World?
        Under World is rated as Blue difficulty. The physical rating is Moderate. The average grade is 1.115%. The climb difficulty is rated Blue.
        ▼ What is the elevation gain for Under World?
        Under World has 100 ft of elevation gain. The trail has 78 ft of elevation descent. The elevation ranges from 523 ft to 615 ft.
        ▼ Is Under World a point to point trail?
        Under World is not a point to point trail. The direction is Both Directions. The trail type is singletrack.
        ▼ How long is Under World?
        Under World is 1,939 ft long. The trail type is singletrack.
        ▼ Are dogs allowed on Under World?
        Yes, dogs are allowed on Under World. Please keep dogs on a leash where required and clean up after them.
        ▼ When is the best time of year to ride Under World?
        Based on activity log data, the most popular months to ride Under World are:
        • August (10 activities)
        • November (8 activities)
        • September (6 activities)
        Check the reports page for current trail conditions.
        ▼ How do I access Under World? Where is the closest parking trailhead?
        The closest parking and trailhead locations to Under World are: View all parking locations in the area.
        ▼ How long does it take to ride Under World?
        Based on recorded activities, it takes an average of 5 minutes to ride Under World. The trail is 1,939 ft long. Actual times will vary based on fitness level, conditions, and pace. View recent activity logs for more details.
        ▼ How busy is Under World?
        Under World is a moderately popular trail. There have been 242 recorded activities on this trail. The trail has received 263 check-ins. View recent activity on this trail.

        Hit the Trail

        Open in App

        Get this trail on your phone instantly.
        open trail in app

        Download Trail

        Save to wishlist, Garmin & download.
        save the trail

        Find Related Routes

        Find routes and users activities that include this trail.
        find routes for this trail

        You must enter a description before submitting.