5 miles
Distance
274 ft
Climb
-2,417 ft
Descent
00:43:22
Avg time
Trail Supporters, Builders & Maintainers of Thunder MTN DH Trail

Thunder MTN DH Details

  • Activities
    • Mountain Bike
  • Riding Area
    Kirkwood Mountain Resort
    Kirkwood, California
  • Difficulty Rating
  • Trail Type
    Singletrack
  • Bike Type
    AM
  • Trail Usage
    Biking Primary
  • Direction
    Downhill Primary
    Popular direction shown
  • Climb Difficulty
    Black Diamond
  • Physical Rating
    Hard
  • Dogs Allowed
    Yes
  • TTFs on Trail
    Rock Garden
  • Global Ranking
    #4653 in Mountain Biking
  • Local Popularity
    100 in Mountain Biking
  • Land Manager
    USFS

This trail is usually open from from June until the first big storm in late October. It can access from the Thunder mountain trail head and can be looped by riding up the castle rock trail on the North side of 88. This a difficult dh that starts off with flowing single track on loose small rocks and then gets chunky and technical for the last 2/3. One of the longer and more technical downhills in the region.

Bike Park

More Stats for Thunder MTN DH bike trail
  • Altitude change
    -2,143 ft
  • Altitude min
    7,160 ft
  • Altitude max
    9,310 ft
  • Altitude start
    9,303 ft
  • Altitude end
    7,160 ft
  • Grade
    -8.578%
  • Grade max
    -51.433%
  • Grade min
    31.81%
  • Distance climb
    3,446 ft
  • Distance down
    4 miles
  • Distance flat
    1,277 ft
  • Avg time
    00:43:22
  • view trail stats
Status:
on Aug 11, 2019
Very Dry
Avg: 5 (4 votes)

view (68)
close
Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Dry
  • Very Dry
Trail Ridden Direction
Trailforks scans users ridelogs 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 riders are riding a trail in its intended direction.
  • > 96%
  • > 90%
  • > 80%
  • > 70%
  • > 50%
  • < 50%
Trail Last Ridden
Trailforks scans ridelogs 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
ContributeDetails
Colors indicate trail is missing specified detail.
  • Description
  • Photos
  • Description & Photos
  • Videos
Trail Popularity ?
Trailforks scans ridelogs 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 rides = more kinetic energy = warmer colors.
  • most popular
  • popular
  • less popular
  • not popular

LEGEND
Trail Difficulties
  • Access Road/Trail
  • White
  • Green
  • Blue
  • Black
  • Double Black Diamond

Trail Report Status
  • Clear / Green
  • Minor Issue / Yellow
  • Significant Issue / Amber
  • Closed

  • Land Owner Overlay
  • Wilderness (typically no bikes in USA)
  • BLM (public)
  • USFS (Wildlife sanctuaries darker than usfs)
  • State land
  • Indigenous
  • Military
Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Dry
  • Very Dry
  • Map Markers
  • trail Trail Head
  • photo Photo
  • place Directory Listing
  • region Riding Area
  • TTF TTF
  • Parking Parking
  • Viewpoint Viewpoint
  • Information Information
  • Warning Warning
  • Directions Directions
  • Sight Sight
  • Restrooms Restrooms
  • eBike Charging Point eBike Charging Point
  • Water Fountain/Source Water Fountain/Source
  • Gate Gate
  • Trail Sign Trail Sign
  • Table or Bench Table or Bench
  • Ladder Ladder
  • Stairs Stairs
  • Bridge Bridge
  • Camping Camping
  • Cabin Cabin
  • Lodge Lodge
  • Bear Cache Bear Cache
  • Dock Dock
  • Ranger Station Ranger Station
  • Summit Summit
  • Other Other
      Directions to thunder-mtn-dh trailhead (38.677840, -120.084180)
      update trails status or condition

      Thunder MTN DH Trail Reports

      statusdatedescription
      Aug 11, 2019 @ 8:27am
      Aug 11, 2019
      A few snow patches near top on way up and down the DH.
      Aug 4, 2019 @ 5:09pm
      Aug 4, 2019
      I did the entire Thunder Mountain Loop including castle rock trail. I probably won’t mtb this trail again, besides multiple trees over the...
      Jul 30, 2019 @ 10:19am
      Jul 30, 2019
      2 patches of snow still remain. 1 18" tree down on thunder mtn trail before connecting to Horse Canyon. 1 24" tree down on Horse canyon....
      Jul 19, 2019 @ 6:25pm
      Jul 19, 2019
      Trees are cleared now. If approaching from thunder mountain there are a few lingering patches of snow in the trees at the beginning and near where...
      Jul 10, 2019 @ 5:51pm
      Jul 10, 2019
      8 downed trees on lower horse canyon. Need chainsaw. Snow just before junction with thunder mtn
      view all reports »

      Recent Ridelog Activity on Trail

      Past Week
      • 0 rides
      •  
      6 Months
      • 40 rides
      • 14 miles avg distance
      All
      • 26 rides
      •  

      Photos

      more »
      58 |
      Nov 6, 2018 @ 2:50pm
      Nov 6, 2018
      156 |
      Nov 28, 2017 @ 8:55pm
      Nov 28, 2017
      118 |
      Nov 28, 2017 @ 8:53pm
      Nov 28, 2017
      110 |
      Nov 28, 2017 @ 8:53pm
      Nov 28, 2017

      Trail Lists

      Routes with this trail

      titleratingdistance
      Thunderous Loop
      28 miles

      3 Reviews & Comments

      • + 1
      flag whoisadam (Jul 23, 2018 at 11:09)
       An amazing Gem of a trail. One of the most beautiful climbs I have ever done and the downhill is a hoot. Fast flowy parts through wild flowers at the top with epic views, then tons of technical rocks garden through the forest. I posted a video of the trail in the VIDEO TAB. This is probably my favorite ride in the Kirkwood area. I found this more fun than the Silver Fork DH trail but the rocks gardens slightly easier than Silver Fork DH.
      [Reply]
      • + 1
      flag backyardadventuregirl (Aug 15, 2018 at 18:18)
       This ride is definitely better done by riding up Castle Rock and then up Thunder Mountain to the top and then back down. Can do the last .5 miles as a hike or a bike. The Thunder Mountain DH section of the loop is chewed up. It looks like it gets a lot of horse use so there are lots of loose rocks in-between the larger rock drops. Disappointing but we'll definitely do it the other way some time.
      [Reply]
      • + 1
      flag stoneman775 (Sep 14, 2019 at 18:49)
       Did this as a loop from Horse Canyon trailhead. The uphill is spectacular, and strenuous. The technical downhill was severely disappointing. Loose dirt on top of whatever, loose watermelon size rocks. If the trail hadn't been destroyed by dirt bikes, it would be nice, so consider this a great trail if you have a motorized bike. It was hard to tell whether the humps under the dust were rocks or roots or dirt. The CCC was out there repairing the trail, but their solutions were definitely not hoping to create a great mountain bike trail. sections of trail were filled in with watermelon size rocks, but not fun to ride. The bottom flowy sections were good. Overall, a great loop, but don't do it hoping for a top of the scale downhill. Compared to other local trails with technical downhill, this is not a great one.
      [Reply]

      Post a Comment



      You must login to Pinkbike.
      Don't have an account? Sign up

      Join Pinkbike  Login

      Videos

      more »
      youtuber Thunder Mountain EPIC! - Mountain Biking...
      8:19 | 24 | Oct 9, 2019 , Kirkwood
      youtuber Thunder Mountain 2018 (Kirkwood,CA) Mountain...
      9:49 | 218 | Oct 22, 2018 , Kirkwood
      MTN BIKE | Thunder MTN Downhill | Kirkwood, CA
      3:01 | 340 | Jul 23, 2018 , Kirkwood
      • subscribe
      • flag
      • login to download gpx or kml files.