1.0 mile
Distance
9 ft
Climb
-194 ft
Descent
00:09:17
Avg time

Tunnel 4 Details

  • Activities
    • Mountain Bike
    • E-Bike
    • Hike
    • Trail Running
  • Riding Area
    Los Peñasquitos Canyon
    San Diego, California
  • Difficulty Rating
    Blue rate
  • Voted Difficulty
    Blue (4 votes)
  • Trail Type
    Singletrack
  • Bike Type
    AM, XC, Fat, Adaptive MTB
  • Direction
    Both Directions
  • Climb Difficulty
    Blue
  • Physical Rating
    Moderate
  • Trail Visibility
    Always easy to follow
  • Family Friendly
    Yes
  • Dogs Allowed
    Yes
  • eBike Allowed
    Yes up to Class 1
  • Global Ranking
    #869 in Mountain Biking [+]
    • #1706 in E-Biking
    • #78742 in Trail Running
    • #14217 in Hiking
  • Local Popularity
    100 in Mountain Biking [+]
    • 100 in E-Biking
    • 95 in Trail Running
    • 90 in Hiking
  • Land Manager
    City of San Diego

One of the few surviving tunnel trails. It gets its name from the way it swoops through dense scrub oak.

Trail is bi-directional. Always anticipate other trail users.

source: The UNPavement
Adaptive Bike Info
aMTB 2 Rating: Obstacles exist. You may or may not be able to ride this solo. Support rider recommended.

This trail can be very precarious in sections. Please exercise caution. Advanced riders only. There is one unmarked ride-around that concerned preservationists keep blocking until we can get signage up. Be sure to take East Deer Canyon for exit. Tunnel 1 is mostly impassable for aMTB

Local Trail Association
Traditionally Indigenous Territory
More Stats for Tunnel 4 mountain bike trail trail
  • Altitude change
    -186 ft
  • Altitude min
    243 ft
  • Altitude max
    437 ft
  • Altitude start
    437 ft
  • Altitude end
    253 ft
  • Grade
    -3.5%
  • Grade max
    -13.3%
  • Grade min
    4.3%
  • Distance climb
    371 ft
  • Distance down
    3,990 ft
  • Distance flat
    974 ft
  • Avg time
    00:09:17
  • Avg reverse time
    00:14:21
  • view trail stats
Status:
on Jun 29, 2022
Ideal
Avg: 4.4 (24 votes)
Your vote: 0

view (12,242)
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  • Basemap 
  • Trail Style 
    • ?
  • Activity Type  
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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  • popular
  • less popular
  • not popular
ATV/ORV/OHV Filter
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
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 tunnel-4 trailhead (32.945430, -117.164210)
      update trails status or condition

      Tunnel 4 Trail Reports

      statusdatedescription
      Jun 29, 2022 @ 12:30pm
      Jun 29, 2022
      		 Please watch for any horse traffic and take their picture. Tree overhang cutting was most likely by horse riders. We'd like to catch them
      Jun 28, 2022 @ 12:20pm
      Jun 28, 2022
      		 someone went through and cut a significant number of overhead trees. This was vandalism. "tunnels" is gone. An "equestrian" did that in 2009 and...
      May 30, 2022 @ 9:19am
      May 30, 2022
      May 29, 2022 @ 8:55am
      May 29, 2022
      Apr 30, 2022 @ 10:38pm
      Apr 30, 2022
      		 Top third is a little chunky but the path worn through the gravel is pretty good and cuts a desirable line. Go high on the berms.
      view all reports »

      Recent Ridelog Activity on Trail

      Past Week
      • 76 rides
      • 14 miles avg distance
      6 Months
      • 1,691 rides
      • 15 miles avg distance
      All
      • 10,508 rides
      •  

      Technical Trail Features (TTF)

      Photos

      more »
      45 |
      Feb 26, 2022 @ 12:46pm
      Feb 26, 2022
      38 |
      Feb 26, 2022 @ 12:46pm
      Feb 26, 2022
      | 1 comments
      36 |
      Feb 26, 2022 @ 12:46pm
      Feb 26, 2022
      | 1 comments
      34 |
      Feb 26, 2022 @ 12:06pm
      Feb 26, 2022
      | 1 comments

      Routes with this trail

      more »
      titledistance
      The East Ender21 miles
      Flow Equation8 miles
      Los Penasquitos Canyon Loop aMTB-212 miles
      Big PQ Loop w/Ocean Air and Shits18 miles

      Links

      11 Reviews & Comments

      • + 2
      Michaelnz7Tdh (Jun 15, 2021 at 19:37)
       Needs a one way do not enter sign at the exit for mtb. Almost collided with some guys going the wrong way. Who enjoys climbing this thing?
      [Reply]
      • + 0
      brianpetry TRAILFORKS (Jun 16, 2021 at 13:28)
       The PQ rangers tried that and then reverted to bi-directional. I climb T4 fairly frequently. It's a more enjoyable climb than cardiac. Also, hikers and trail runners use T4 in both directions. Bells are important.
      [Reply]
      • + 2
      mattyj2001 (Apr 30, 2022 at 22:37)
       I've never done a climb that I would describe as 'enjoyable'. Ha ha.
      [Reply]
      • + 1
      brianpetry TRAILFORKS (May 2, 2022 at 14:25)
       Agree. It's all relative!
      [Reply]
      • + 2
      NFLPhD (Oct 25, 2020 at 15:15)
       This is a great trail that is fast and flowy and weaves its way through the canopy of trees and bushes... A lot of cobblestones at the top so make sure you ride fast enough to get up on the dirt berms to go through the turns... Several low branches that you can hit your head on or your light on your helmet if riding at night. The trail is narrow on a few sections.
      A must ride for anyone visiting this area for the first time.
      [Reply]
      • + 1
      budgetmtb (Jul 29, 2020 at 18:34)
       A great fun trail. Lot's of shade, unlike the surrounding trails.
      [Reply]
      • + 2
      Dreid44 (Jul 19, 2020 at 20:27)
       Love This Trail!!!!!!!!
      [Reply]
      • + 1
      budgetmtb (May 27, 2020 at 8:39)
       New one way only sign posted at the top.
      [Reply]
      • + 1
      ewikpark (Mar 14, 2020 at 19:59)
       Fallen tree is still not cleared, I don't know if I have permission to clear it. Also there is a low lying branch in one of the downhill sections that almost got me. Be wary of that when you go down
      [Reply]
      • + 1
      OBkook (Oct 3, 2019 at 19:33)
       Fun trail! Wear eye protection. I ran into a small low hanging branch, had I not been wearing glasses I may have suffered an eye injury.
      [Reply]
      • + 1
      anthonydiaz (Jul 18, 2018 at 12:47)
       fun trail. just watch for the loose rocks at the beginning. after that its smooth sailing.
      [Reply]





      Videos

      more »
      Tunnel 4 | Los Peñasquitos Canyon | San...
      3:38 | 40 | Jun 4, 2022 , San Diego
      Downhill Tunnel Vision || Specialized Turbo...
      2:52 | 159 | Dec 17, 2021 , San Diego
      Tunnel 4 DH (11/21/21)
      4:51 | 84 | Dec 7, 2021 , San Diego
      Tunnels | San Diego, CA
      7:38 | 95 | Nov 17, 2021 , San Diego

      Nearby Trails

      Los Peñasquitos Canyon

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