1.5 miles
Distance
17 ft
Climb
-1,151 ft
Descent
00:27:39
Avg time

Undertow Details

  • Activities
    • Mountain Bike
    • E-Bike
    • Hike
    • Trail Running
  • Riding Area
    Rocky Peak Park
    Simi Valley, California
  • Difficulty Rating
  • Voted Difficulty
    Double Black Diamond (6 votes)
  • Trail Type
    Singletrack
  • Bike Type
    DH
  • Direction
    Downhill Primary
    Popular direction shown
  • Dogs Allowed
    Yes
  • eBike Allowed
    Yes up to Class 1
  • TTFs on Trail
    Drop, Jump, Rock Face, Rock Garden
  • Global Ranking
    #8189 in Mountain Biking [+]
    • #906 in E-Biking
    • #78092 in Trail Running
  • Local Popularity
    100 in Mountain Biking [+]
    • 5 in Trail Running
    • 5 in Hiking

One of three trails descending westward off the Rocky Peak Trail, Undertow offers many rock rolls, step-ups, and step-downs. It is more technically challenging than the adjacent trail Hummingbird.

This trail is unsanctioned.

Traditionally Indigenous Territory
More Stats for Undertow mountain bike trail trail
  • Altitude change
    -1,135 ft
  • Altitude min
    1,139 ft
  • Altitude max
    2,276 ft
  • Altitude start
    2,273 ft
  • Altitude end
    1,138 ft
  • Grade
    -14.3%
  • Grade max
    -94.6%
  • Grade min
    9.3%
  • Distance climb
    364 ft
  • Distance down
    1 mile
  • Distance flat
    164 ft
  • Avg time
    00:27:39
  • Avg reverse time
    00:58:35
  • view trail stats
Status:
on Dec 10, 2022
Ideal
Avg: 4.9 (13 votes)
Your vote: 0

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Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Snow Cover Inadequate
  • 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.
  • > 96%
  • > 90%
  • > 80%
  • > 70%
  • > 50%
  • < 50%
  • bi-directional trail
  • no data
Trail Last Ridden
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  • < 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 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.
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  • less popular
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Max Vehicle Width
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Radar Time
x Activity Recordings
Trailforks users anonymized public ridelogs from the past 6 months.
  • mountain biking recent
  • mountain biking (>6 month)
  • hiking (1 year)
  • moto (1 year)
Activity Recordings
Trailforks users anonymized public skilogs from the past 12 months.
  • Downhill Ski
  • Backcountry Ski
  • Nordic Ski
  • Snowmobile
Jump Magnitude Heatmap
Heatmap of where riders jump on trails. Zoom in to see individual jumps, click circles to view jump details.
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      Directions to undertow-150409 trailhead (34.284160, -118.637850)
      update trails status or condition

      Undertow Trail Reports

      statusdatedescription
      Dec 10, 2022 @ 7:38am
      Dec 10, 2022
      Light rain. Perfect dirt. All time conditions, this is what we dream about out here
      Apr 26, 2022 @ 9:01pm
      Apr 26, 2022
      Feb 12, 2022 @ 7:34am
      Feb 12, 2022
      Jan 25, 2022 @ 1:36pm
      Jan 25, 2022
      Jan 16, 2022 @ 7:41pm
      Jan 16, 2022
      view all reports »

      Recent Ridelog Activity on Trail

      Past Week
      • 3 rides
      • 6 miles avg distance
      6 Months
      • 115 rides
      • 10 miles avg distance
      All
      • 1,218 rides
      • Last: Mar 18, 2023

      Photos

      more »
      0 |
      Mar 14, 2023 @ 4:12pm
      Mar 14, 2023
      55 |
      Apr 26, 2022 @ 9:00pm
      Apr 26, 2022
      80 |
      Dec 8, 2021 @ 3:16pm
      Dec 8, 2021
      85 |
      Dec 8, 2021 @ 3:15pm
      Dec 8, 2021

      Trail Lists

      Routes with this trail

      titledistance
      Rocky peak enduro sampler13 miles
      Chumash-RockyPeak-Undertow10 miles
      Rocky Peak to Undertow3 miles

      9 Reviews & Comments

      • + 0
      Verdugist (Sep 25, 2022 at 13:00)
      After having tried this trail for the 3rd time today and just returning from black and double black trails in Whistler, this is definitely a double black. Much more technical and intimidating than Snow Summit 10 ply (minus the gap jumps) with high risk/consequence in at least 3 sections (all steep tech rollers). Especially now in the extremely loose sandy/dusty conditions. Very steep in some sections and generally constant tech as well as off camber sections to keep you on your toes. If you know the lines the overall flow of the trail is very good. Wear full face and chest/back guard.
      [Reply]
      • + 0
      bigchipero (Jul 30, 2022 at 15:31)
      this trail was definitely for the advance rock rider! serious drops that will put u in da hospital if u don’t know watcha do’in. Also even on a eBike u are going to want to shuttle cuz there are no good uphill options back to the top !
      [Reply]
      • + 0
      nofunstravaguy (Apr 26, 2022 at 21:03)
      This trail is rad! Definitely a 'Hard Black'. There are fewer difficult features than The Grudge, so I'dsay slightly easier overall. However, there are a few large rock rolls and steeps sections which are harder than The Grudge. I'd say The Grudge has more bang for buck - more stacked with rollers jumps and slabs. Both are AWESOME.
      [Reply]
      • + 0
      Marcpelosi (Sep 21, 2021 at 12:54)
      I would definitely rate this a double black. Has some ride arounds but a couple features makes this a double black. Best trail I’ve ridden in LA so far for downhill/enduro
      [Reply]
      • + 1
      blindstuff VKBC (Sep 20, 2021 at 10:53)
      By far the hardest of the three trails off rocky peak road. A few rock rolls on this one are quite technically challenge, definitely not let go and hang on like you can do on some on the grudge. If you're an advanced rider and want a challenge this is it, unless you're really good it'll take a couple of rides through to clean the trail top to bottom
      [Reply]
      • + 1
      Stlc (Jan 7, 2021 at 10:29)
      Of the three main trails Undertow is the most difficult. Then the Grudge and Hummingbird is last on the list...
      [Reply]
      • + 1
      dantepetri1 (Oct 27, 2019 at 18:01)
      Super fun trail, little bit of everything and great hard pack traction
      [Reply]
      • - 2
      dynamatt (Jan 13, 2019 at 19:34)
      Next level conditions, loads of traction, trail drains well
      [Reply]
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      Videos

      more »
      Undertow - Rocky Peak Simi Valley Part 1
      13:23 | 313 | Oct 14, 2021 , Simi Valley
      ROCKY PEAK/ UNDERTOW Trail-Simi Valley
      10:32 | 476 | May 1, 2021 , Simi Valley
      Rocky Peak MTB
      13:08 | 310 | Jan 11, 2021 , Simi Valley
      Undertow PR | Rocky Peak MTB 4K
      6:03 | 531 | Sep 25, 2020 , Simi Valley

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