1.5 miles
Distance
17 ft
Climb
-1,151 ft
Descent
00:26:28
Avg time

Undertow Details

  • Activities
    • Mountain Bike
    • E-Bike
    • Hike
    • Trail Running
  • Riding Area
    Rocky Peak Park
    Simi Valley, California
  • Difficulty Rating
    Black Diamond rate
  • Voted Difficulty
    Double Black Diamond (12 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
    00:26:28
  • Avg reverse time
    00:58:35
  • view trail stats
Status:
on Jun 4, 2024
Dry
Avg: 4.52 (23 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
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
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  • 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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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
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      Directions to undertow-150409 trailhead (34.284160, -118.637850)
      update trails status or condition

      Undertow Trail Reports

      statusdatedescription
      Jun 4, 2024 @ 2:26pm
      Jun 4, 2024
      		 Great shape, little dusty
      Dec 15, 2023 @ 11:34pm
      Dec 15, 2023
      Nov 19, 2023 @ 7:28pm
      Nov 19, 2023
      Jun 7, 2023 @ 10:59pm
      Jun 7, 2023
      		 Fully dry, path is cleared and without hazards. Because it is very dry some steep areas feel loose, more so in The Grudge than in Undertow.
      Apr 8, 2023 @ 3:44am
      Apr 8, 2023
      view all reports »

      Recent Ridelog Activity on Trail

      Past Week
      • 0 rides
      •  
      6 Months
      • 21 rides
      • 18 miles avg distance
      All
      • 184 rides
      • Last: Jun 6, 2025

      Technical Trail Features (TTF)

      Photos

      more »
      77 |
      Jun 4, 2024 @ 2:27pm
      Jun 4, 2024
      131 |
      Mar 14, 2023 @ 4:12pm
      Mar 14, 2023
      161 |
      Apr 26, 2022 @ 9:00pm
      Apr 26, 2022
      187 |
      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

      12 Reviews & Comments


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      Videos

      more »
      youtuber It was BIG and I didn’t think. - Rocky Peak,...
      13:06 | 431 | Apr 24, 2023 , Simi Valley
      Simi MTB - Undertow @Rocky Peak
      3:20 | 62 | Nov 11, 2024 , Simi Valley
      Simi MTB - Undertow @Rocky Peak
      5:44 | 115 | Jun 12, 2024 , Simi Valley
      Rocky Peak Horror Show - Riding the Undertow...
      19:27 | 114 | Mar 12, 2024 , Simi Valley

      Nearby Trails

      Rocky Peak Park

      • #150409 - 11,440 views

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