more stats
2,103 ft
Distance
14 ft
Climb
-486 ft
Descent
00:02:46
Avg time
-472 ft
Altitude change
6,353 ft
Altitude min
6,825 ft
Altitude max
6,825 ft
Altitude start
6,352 ft
Altitude end
-22.4%
Grade
-51.7%
Grade max
19.8%
Grade min
75 ft
Distance climb
1,913 ft
Distance down
95 ft
Distance flat
00:02:46
Avg time

GZA Details

  • Activities
    • Mountain Bike
    • Hike
    • Trail Running
  • Riding Area
    Lefthand OHV
    Boulder, Colorado
  • Difficulty Rating
    Double Black Diamond Rate
  • Voted Difficulty
    Double Black Diamond (1 vote)
  • Local Popularity
    70 in Mountain Biking [+]
    • 5 in Trail Running
    • 5 in Hiking
  • Global Ranking
    #2566 in Mountain Biking [+]
    • #294797 in Trail Running
    • #306189 in Hiking
  • Trail Type
    Singletrack
  • Dogs Allowed
    Yes
  • eBike Allowed
    No
  • Land Owner
    USFS - Boulder Ranger District

Starts out mellow with a few loose turns, then starts to point down the hillside. About a quarter of the way in is where it gets really fun. A few steep turns in a row, followed by a step-down/step-up combo that's super rad at speed. Goes into a "rollercoaster" section a la Indiana Jones, and ends with a steep roll down to Canyon Rim. One of the best trails at LH in my opinion.

This trail is unsanctioned.

Traditionally Indigenous Territory

Recent Activity on Trail

Past Week
  • 1 rides
  • 13.2 km average
6 Months
  • 35 rides
  • 11.7 km avg distance
All
  • 304 rides
  • Last: Aug 11, 2026
c1c2c3c4
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GZA Trail Reports

statusdatedescription
Jan 29, 2026 @ 3:12pm (America/Denver)
Jan 29, 2026
Dec 13, 2025 @ 8:23pm (America/Denver)
Dec 13, 2025
Jul 12, 2025 @ 1:34pm
Jul 12, 2025
 Pretty eroded after fast flat section and into the steep switchbacks
Apr 8, 2025 @ 10:25am
Apr 8, 2025
Feb 5, 2025 @ 9:51am
Feb 5, 2025
 Running great
more »
Status:
on Jan 29, 2026
Very Dry
Avg: 4.49 (10 votes)
Your vote: 0

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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
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Flat N NE E SE S SW W NW
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        Directions to gza trailhead (40.113160, -105.341670)

        Photos

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

        Videos

        2 more »
        Lefthand Canyon Colorado - GZA - WOW what an...
        mtb
        4:55 | 326 | Sep 15, 2024 , Boulder
        GZA - Left Hand Canyon - Mtn Biking
        mtb
        2:24 | 796 | Nov 16, 2022 , Boulder

        5 Reviews & Comments


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        Frequently Asked Questions About GZA

        ▼ Where is GZA located?
        GZA is located in Lefthand OHV, Boulder, Colorado, United States. It is part of the Lefthand OHV trail network. The trailhead is located at coordinates 40.11316, -105.34167.
        ▼ How hard is GZA?
        GZA is rated as Double Black Diamond difficulty. The average grade is 22.4%.
        ▼ What is the elevation gain for GZA?
        GZA has 14 ft of elevation gain. The trail has 486 ft of elevation descent. The elevation ranges from 6,353 ft to 6,825 ft.
        ▼ How long is GZA?
        GZA is 2,103 ft long. The trail type is singletrack.
        ▼ Are dogs allowed on GZA?
        Yes, dogs are allowed on GZA. Please keep dogs on a leash where required and clean up after them.
        ▼ When is the best time of year to ride GZA?
        Based on activity log data, the most popular months to ride GZA are:
        • May (13 activities)
        • March (12 activities)
        • February (8 activities)
        Check the reports page for current trail conditions.
        ▼ How do I access GZA? Where is the closest parking trailhead?
        The closest parking and trailhead locations to GZA are: View all parking locations in the area.
        ▼ How long does it take to ride GZA?
        The estimated time to ride GZA is approximately 3 minutes. The trail is 2,103 ft long. Actual times will vary based on fitness level, conditions, and pace.
        ▼ How busy is GZA?
        GZA is a very popular trail. There have been 3,866 recorded activities on this trail. The trail has received 4,299 check-ins. View recent activity on this trail.

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