5.9 miles
Distance
1,597 ft
Climb
-1,587 ft
Descent
4,013 ft
High Point
10 ft
Altitude change
2,798 ft
Altitude min
2,809 ft
Altitude start
2,818 ft
Altitude end
-51.8%
Grade max
59%
Grade min
3 miles
Distance climb
3 miles
Distance down
1,490 ft
Distance flat

These trails are not 100% sanctioned. Be courteous to other trail users so we can keep riding them.

A fun loop to grab the bottom half of Milagrosa, which is fun, fast, and rocky. The descent from Agua Caliente to Miliagrosa is also fantastic and worth the extra bit of climbing. AC Canyon (Gnats) is a challenging climb that will involve some HAB, but it is more rideable and a bit shorter than taking Agua Caliente all the way up.

Great in Winter, can get very hot in Summer.

Detailed Description
Gnats Millie Loop is a 6 mile popular extreme route located near Tucson Arizona. This mountain bike only route. This route includes 4 trails. This route climbs 1,597 ft with a max elevation of 4,013 ft then descends -1,587 ft.
Tags
CanyonRocky

Local Trail Association

Local trail association
Tucson Off-road Cyclists and Activists (torca.org)
Please consider joining or donating to the local riding association to support trail development & maintenance.
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Stats

  • Distance
    6 miles
  • Avg time
    1 hr 46 min
  • Altitude change
    10 ft
  • Altitude min
    2,798 ft
  • Altitude start
    2,809 ft
  • Altitude end
    2,818 ft
  • Climb
    1,597 ft
  • Descent
    -1,587 ft
  • Grade max
    -51.8%
  • Grade min
    59%
  • Distance climb
    3 miles
  • Distance down
    3 miles
  • Distance flat
    1,490 ft

20 Reviews & Comments

kraudust kraudust
Love it! This is one of my favorite loops in Tucson.

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Trails in Route

Details

  • Riding area
  • Primary Activity
    Mountain Bike
  • Difficulty rating
    Double Black Diamond
  • Activity Logs
    4
Avg: 5 (2 votes)
close
Trail transparency
  • Singletrack
mtb
81
mtb
70
mtb
57
mtb
43
youtuber Seriously scenic, technical MTB trail in...
mtb
Seriously scenic, technical MTB trail in Tucson, AZ - La Milagrosa
13:44 | 371 | comments: 0 | favs:
May 24, 2024
Agua Caliente Saddle To La Milagrosa Descent
mtb
Agua Caliente Saddle To La Milagrosa Descent
4:46 | 291 | comments: 0 | favs:
Feb 26, 2024

Recent Trail Reports Along Route

statustraildateconditiondescription
La Milagrosa
Jan 29, 2026 @ 1:10pm (America/Phoenix)
Jan 29, 2026
A.C. Canyon
Apr 18, 2025 @ 11:47am
Apr 18, 2025
There were no issues on the trail. It is not overgrown. The vertical section at the trail end is very loose and chunky, but to be expected for a steep black trail.
Milagrosa to Agua Caliente
Mar 21, 2025 @ 7:00am
Mar 21, 2025
more reports »
  • By davar16TF Pro & contributors
  • #26674 - 1,082 views

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