18.7 miles
933 ft
-6,913 ft
2 miles
High Point

Summit of Mount Lemmon to Charolueax Gap

Detailed Description
CDO Callin is a 19 mile less popular extreme route located near Catalina Arizona. This mountain bike only route. This route includes 4 trails. This route climbs 933 ft with a max elevation of 9,103 ft then descends -6,913 ft.
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14 Reviews & Comments

  • + 1
bigworm520 TORCA (Mar 29, 2022 at 15:41)
3/29/2022 Update. TRAIL IS STILL CLOSED.
Scouted this trail for TORCA and the Forest Service this weekend. 90% of trail in the drainage is gone and unfollowable. Highly recommend not attempting this trail and continue to respect the closure order. You will be very thankful that you did.
  • + 0
XCrider27 (Dec 24, 2021 at 11:26)
Still closed per Forest Service
  • + 1
cmrnbrns (Apr 10, 2021 at 14:49)
Trail is gone due to fire and heavy erosion.
  • + 0
Bangswitch (Nov 18, 2020 at 9:36)
Past the CDO junction this is not a a mountain bike trail unless you like rock climbing with your bike and bushwhacking while playing hide and seek with the trail for several miles, Samaniego Ridge trail should be removed from the list as anything other than a trashy hiking trail.
  • + 0
Papamarch (May 4, 2020 at 8:32)
Some slow and decently technical switch backs to start but then a fun ride as a connector to CDO, would not recommend it past that turnoff though.
  • + 0
Papamarch (May 4, 2020 at 8:27)
Parked in the 50 yr trailhead lot and booked a shuttle with Tucson Mountain Shuttles (520-403-136Cool to the top of Mt Lemmon. Good price, service, and professionalism; I'd use them again. CDO is a very fun trail and water was flowing on May 3. Quite techy and lots off lose granite dropping into the canyon, there were quite a few spots we had to walk our bikes to get down but once your in the canyon by the creek it's an amazing ride down to the jeep trail where you have 3 miles or brutal climbing and then more down hill fun. Bring LOTs of water and make sure you get a very early start. We met the shuttle at 5:30 and in hindsight wished we would have met him at 4:00. Parking at the bottom of the Jeep trail is your best bet unless you're an animal and want to finish up at the 50 yr trailhead which adds about another 5 miles.
  • + 0
Papamarch (May 4, 2020 at 8:10)
First 3 miles after leaving CDO on this jeep trail is brutal, but it summits out and the last 5 miles down to the bottom or 50yr trail system is very fast and fun. We parked at the 50yr Trailhead definitely wish we would have parked at the bottom of this jeep trail instead as this was a very very long day.
  • + 1
Krod234 (Apr 30, 2020 at 17:42)
Group of four of us rode the CDO - mild climate at the top, started off with a well clean recognizable trail, lots of leaves over the trail but smooth and not very technical. Plan on many creek crossings and surprised on how much water was flowing. If we could only do the CDO that would e perfect, but the climb up Charouleau Gap climb was brutal with loose dirt and irregular terrain even though it was a jeep trail. Overall the views of CDO cant be beat and well worth the run!
  • + 1
Inertiaman (Apr 23, 2020 at 9:53)
This "road" is useful to make loops that connect to the 50 Year system, but it will appeal to very few as an out-and-back. If you like the challenge of finding lines through off-camber waves of 3' deep erosion ruts littered with loose baby heads and loose sand, sometimes on steep gradients, this one's for you.
  • + 2
Inertiaman (Apr 23, 2020 at 9:48)
This is the sort of ride that you'll be glad you did, but you won't be planning a repeat in the near future. The awesomeness of its scale, scenery and (some) quality trail is balanced by persistent dismounts for creek crossings and rock outcrops. The grunt out via Charouleau Gap probably isn't going to be loved by many, either, thanks to the challenges of steep, loose, heavily eroded and often wildly off-camber lines. Definitely a must-do for advanced or better riders in Tucson, but your tastes will determine if its a must-redo. Also, while it may be double-black to clean a high proportion of the rock pinches and/or steep lines up top, its manageable for a competent advanced rider with reasonable judgment and occasional walking.
  • + 1
culife (Jul 6, 2019 at 11:34)
WARNING: Extremely Overgrown. Read trail report. Do yourself a favor and ride CDO instead.
  • + 1
whoisadam (Dec 9, 2018 at 18:31)
A true backcountry ride, doesn't seem like it gets a lot of traffic, pretty overgrown at parts, getting wacked in the face from plants and navigating rock gardens. Some pretty steep hairpins towards the beginning, then some awkward rock gardens to navigate. Towards the middle/end tons of creek crossing so many that it kind of gets annoying. The very end is overgrown tall grass that hides rocks so watch out. I posted a video of the trail under the video tab to give ya an idea. The other stuff off the front side of Mt Lemmon I would say is more fun. If you have ridden those trails such as Incinerator, Green Mtn, Bugs, Prison Camp, La Milagrosa then I would say give CDO a try. Im glad I rode it.
  • + 0
whoisadam (Nov 22, 2018 at 8:46)
Raw fireroad, rode this after riding canada del oro to connect to the 50 year old trail network. It's a grind but not too steep, 1st parts filled will loose baby head side rocks everywhere, its all rideable but will test your balance. Then the road gets more eroded with interesting big ruts and shapes. Not a fireroad that I would like to ride a bunch. Dropping down from the summit to 50 year old trailhead it is fast and lots of erosion to navigate. Road was a bit of a buzz kill after riding the CDO.
  • - 1
suvlako TORCA (Sep 15, 2016 at 15:10)
For shuttles, guiding, and high-end rentals... contact Home Grown Mountain Biking Tours! Only guide and shuttle company in town that caters to Mt Lemmon, all-mountain and DH/FR riding. All rental bikes are carbon.

Trails in Route


  • Riding area
  • Primary Activity
    Mountain Bike
  • Difficulty rating
    Double Black Diamond
More Stats for CDO Callin mountain bike route
  • Altitude change
    -5,982 ft
  • Altitude min
    3,121 ft
  • Altitude start
    9,103 ft
  • Altitude end
    3,120 ft
  • Grade
  • Grade max
  • Grade min
  • Distance climb
    3 miles
  • Distance down
    15 miles
  • Distance flat
    2,116 ft
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Mtn Bike | Canada Del Oro | Mt Lemmon
Mtn Bike | Canada Del Oro | Mt Lemmon
7:12 | 770 | comments: 0 | favs:
Dec 9, 2018

Recent Trail Reports Along Route

Canada Del Oro
Oct 31, 2022 @ 7:47am
Oct 31, 2022
DO NOT RIDE THIS TRAIL! I cannot overstate enough that this trail is gone. The last person that attempted this on a bike needed to be rescued by search and rescue. I hiked this trail for the Forest Service in March 2022 and it is gone. 300+ trees down over the trail assuming you can find the trail. Significant rock slides and drainage ditches now blocking your path. The entire canyon burned and now has been taken over by locust bushes/tress. Trail from the beginning of the drainage to the Charlou Gap is completely non existent. reporter
Samaniego Ridge
Oct 29, 2022 @ 10:58pm
Oct 29, 2022
Bighorn Fire Closure has been terminated. Trail is OPEN.
Aspen Meadow
May 20, 2022 @ 5:50am
May 20, 2022
Charouleau Gap
Nov 1, 2020 @ 10:48am
Nov 1, 2020
more reports »
  • By culife & contributors
  • #18626 - 312 views