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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)
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.
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
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
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.
- most popular
- popular
- less popular
- not popular
ATV/ORV/OHV Filter
Max Vehicle Width
inches
US Cell Coverage
Legend
Radar Time
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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
Winter Trails
Warning
A routing network for winter maps does not exist. Selecting trails using the winter trails layer has been disabled.
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Missing Trails
Most Popular
Least Popular
Trails are colored based on popularity. The more popular a trail is, the more red. Less popular trails trend towards green.
Jump Magnitude Heatmap
Heatmap of where riders jump on trails. Zoom in to see individual jumps, click circles to view jump details.
Trails Deemphasized
Trails are shown in grey.
Only show trails with NO bikes.
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Activities Click to view
- Mountain Bike
36 trails
- Hike
43 trails
- Trail Running
43 trails
Region Details
- 10
- 3
- 11
- 11
- 1
Region Status
Caution as of Jun 17, 2025Stats
- Avg Trail Rating
- Trails (view details)
- 43
- Trails Mountain Bike
- 36
- Trails E-Bike
- 5
- Trails Horse
- 13
- Trails Hike
- 43
- Trails Trail Running
- 43
- Trails Dirtbike/Moto
- 3
- Trails ATV/ORV/OHV
- 3
- Total Distance
- 78 miles
- Total Descent
- 12,842 ft
- Total Vertical
- 7,018 ft
- Highest Trailhead
- 7,953 ft
- Reports
- 581
- Photos
- 306
- Ridden Counter
- 12,277
Sub Regions
-
Brown Mountain
- 2
- 5
- 4
-
Chilao-Charlton
- 3
- 4
Popular Altadena Mountain Biking Trails
Altadena Mountain Bike Routes
title | rating | distance |
---|---|---|
El Prieto | 6 miles | |
El Prieto Loop | 5 miles | |
Fern - Sunset - El Prieto | 14 miles | |
Fern Truck, Brown Mtn, Gabrielino | 13 miles | |
Ride up to Red Box and down to JPL | 32 miles | |
Mt. Wilson Mega | 25 miles | |
JPL to Brown Mtn - Ken Burton | 8 miles | |
Strawberry Peak | 10 miles | |
MIDDLE SAM MERRILL TO SUNSET RIDGE | 15 miles | |
17 mile Brown Mountain Trials Ride | popular ridelog | 17 miles |
Photos of Altadena Mountain Bike
trail: Pines Trail
3 |
May 29, 2025 @ 11:38pm
May 29, 2025
trail: Pines Trail
4 |
May 29, 2025 @ 11:38pm
May 29, 2025
trail: Pines Trail
1 |
May 29, 2025 @ 11:38pm
May 29, 2025
trail: Pines Trail
2 |
May 29, 2025 @ 11:38pm
May 29, 2025
trail: Lower Gabrielino Trail
234 |
Mar 25, 2018 @ 2:24pm
Mar 25, 2018
trail: Lower Gabrielino Trail
573 |
Apr 18, 2016 @ 10:21am
Apr 18, 2016
trail: Ken Burton
475 |
Apr 18, 2016 @ 10:21am
Apr 18, 2016
trail: Ken Burton
444 |
Apr 18, 2016 @ 10:20am
Apr 18, 2016Videos of Altadena Mountain Bike

trail: El Prieto Trail
0:25 |
148 |
Jul 31, 2020

trail: El Prieto Trail
3:22 |
63 |
Sep 15, 2019

trail: El Prieto Trail
0:48 |
205 |
Jul 10, 2019

trail: El Prieto Trail
0:48 |
|
Jul 9, 2019

trail: Lower Sunset Ridge
4:04 |
113 |
Mar 28, 2019

trail: Millard Canyon Road
0:57 |
136 |
Mar 22, 2019

trail: Fern Truck Trail
2:18 |
341 |
Mar 16, 2019

trail: El Prieto Trail
0:55 |
149 |
Mar 16, 2019
Current Trail Warnings
status | trail | date | condition | user | info |
---|---|---|---|---|---|
Lower Sunset Ridge | Jun 15, 2025 @ 11:07am Jun 15, 2025 | Dry | pijyster | Overgrown with sections washed out. |
Recent Trail Reports
Activity Feed
username | action | type | title | date |
---|---|---|---|---|
flikx | ridden | route | activity #75412550 | Jul 7, 2025 @ 12:51pm 4 hours |
Goodfear | ridden | trail | activity #75359074 | Jul 6, 2025 @ 2:36pm 1 day |
gatsonis15 | wishlist | route | activity #75017211 | Jul 2, 2025 @ 6:00am Jul 2, 2025 |
CarlosCsePgE | wishlist | trail | activity #74932995 | Jun 30, 2025 @ 9:19pm Jun 30, 2025 |
therealslimshaky | ridden | trail | activity #74551630 | Jun 25, 2025 @ 12:18pm Jun 25, 2025 |
Recent Comments
username | type | title | comment | date |
---|---|---|---|---|
trail | This trail rides better than World of... | May 29, 2025 @ 11:34pm May 29, 2025 | ||
trail | Pines trail rides better than World of... | May 29, 2025 @ 11:32pm May 29, 2025 | ||
trail | impossible to complete. landslides destroyed... | May 6, 2025 @ 4:40pm May 6, 2025 | ||
trail | has anybody ridden this trail since it was... | Apr 11, 2025 @ 2:20pm Apr 11, 2025 | ||
trail | About mid way up the trail (with JPL on your... | Feb 19, 2025 @ 10:58pm Feb 19, 2025 |
Local Badges
-
10 Black Trails265 awarded -
Epic Ride Climb 2k381 awarded -
Climbing 10k Badge222 awarded -
Climbing 100k Badge19 awarded -
Epic Ride Descent 2k502 awarded -
Descent 10k Badge248 awarded
Activity Type Stats
activitytype | trails | distance | descent | descent distance | total vertical | rating | global rank | state rank | photos | reports | routes | ridelogs |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mountain Bike | 36 | 67 miles | 11,791 ft | 24 miles | 5,066 ft | #876 | #483 | 304 | 580 | 9 | 23,461 | |
E-Bike | 5 | 9 miles | 817 ft | 3 miles | 3,642 ft | 2 | 371 | 1 | 2,076 | |||
Horse | 13 | 27 miles | 2,710 ft | 9 miles | 6,654 ft | 130 | 2 | |||||
Hike | 43 | 78 miles | 12,841 ft | 27 miles | 7,018 ft | #673 | #419 | 5 | 581 | 1 | 1,628 | |
Trail Running | 43 | 78 miles | 12,841 ft | 27 miles | 7,018 ft | #676 | #420 | 581 | 1 | 378 | ||
Dirtbike/Moto | 3 | 6 miles | 679 ft | 2 miles | 830 ft | 84 | ||||||
ATV/ORV/OHV | 3 | 6 miles | 679 ft | 2 miles | 830 ft | 84 |
- By BlazeNawaY & contributors
- Admins: CORBA
- #9518 - 10,012 views
- altadena activity log | embed map of Altadena mountain bike trails | altadena mountain biking points of interest
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