Registration closes: Mon, Oct 31 @ 11:59PM

About the CV 50/50

The Colossal Vail 50/50, presented by Fleet Feet Tucson, is a combined 50 kilometer/50 mile event using a beautiful high desert section of the Arizona Trail east of Tucson, Arizona, near the community of Vail.  The fast and fun course, and the support along the way, was designed by experienced members of the Tucson Trail Runners to give new ultra runners the best chances of completion, while giving experienced runners a good day as well.  We gave awards to the top three male and female finishers in each event in 2014 and 2015.  Every finisher gets to pick out their unique laser engraved memento.  We used black Mexican river rocks in 2015.  Because the course is two out and back segments, 50 mile runners can complete the 50K route, then get finisher’s credit for that event and an award, if they choose not to complete the full 50M.

The run starts in La Posta Quemada Ranch in Colossal Cave Mountain Park (CCMP), heading south along the scenic eastern boundary between the Sonoran and Chihuahuan Deserts, with open spaces and striking vistas.  The runners reach the northernmost ridges of the Santa Rita Mountains, then come back to La Posta Quemada (LPQ).  The 50 mile entrants continue on, to be met at the north turn around by rangers and volunteers at the boundary of Saguaro National Park.  There are a total of 5 aid stations along the routes, 4 of which get used twice by the runners.  Those are well stocked and managed by experienced ultra runners who understand what you need.  Along the way, the bike patrol organized by our prime sponsor Cirrus Visual will keep an eye on everyone.  At 9:00 AM while the adults are out on the course, we’ll have a family oriented kids 1 mile run.  There will be good food and drink at LPQ, with a party into the night for those who hang around.

While the course is fast, it’s also long. There will be no question of your accomplishment.  The 50K is actually close to 56K (34.6 mi.), while the 50 mile route is actually 53.3 miles.  Since 50/50 has a nice ring, we’re not changing the name to protect the innocence of those who attempt the run.  We will continue to keep the rattlesnakes out of the tunnel under Interstate 10, although there's no telling who else you might meet.

We set the event date to take advantage of the wonderful fall weather in Arizona, which is normally sunny with highs in the 70s in mid-November.  There’s plenty of lodging in nearby Tucson.  There are a large number of campground spots available in CCMP.  The CV 50/50 raises awareness of the Arizona Trail, a National Scenic Trail.  Any profits go to the benefit the Arizona Trail Association.  Please come join us.


For an event like CV 50/50 to be successful, we need lots of volunteers. There are many different ways to help, before the event and on race day. All volunteers get a t-shirt. If you have time and inclination to help us out, please fill out the volunteer form on the event website ( Click the volunteer button and a Google Form will open with details on ways you can help. Thanks!


Early Entry Discount January 1st to February 29th-- 50M $115, 50K $80
March 1st to July 31st-- 50M $125, 50K $90
August 1st to September 29th-- 50M $135, 50K $100
October 1st to Halloween-- 50M $145, 50K 110
Registration Closed Midnight October 31st.

Refund Policy

No refunds will be given for any reason. However, pre-event cancellations accompanied by a signed letter from the participant's physician that supports a legitimate health limitation which prevents the participant from safely running in the event will result in the transfer of registration fee to the following year, less a $20 processing fee. Cancellations must be made at least two weeks in advance of the event date.

Thank You

The 2015 edition of the CV 50/50 went well. 92 runners started the two runs. 21 finished the 50M and 63 finished the 50K. Several 50M starters took the 50K finish option. We had a typical Arizona fall day starting in the 40s and warming to the 70s.  Clouds showed up later in the day.  A number of runners commented that the support was excellent, a testament to our organizing committee and the army of volunteers they recruited.  We had added a 6:30 AM early start option and pushed the Gabe Z Aid Station cut-off out to 3:30 PM to improve the chances of a successful 50k finish.  In the I-10 tunnel, runners were met by Ms. Bones instead of Mr. Bones, and no snakes.  The 2016 CV 50/50 is scheduled for Saturday November 12.  Thanks to all the runners and volunteers who made the 2015 event possible.

Come join us in 2016. Registration opens on New Year's Day.

— Ross Zimmerman (RD), Matt Nelson (Arizona Trail Association ED) and the CV 50/50 organizing committee

Local time: 1:23 AM


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