Saturday, Nov 11, 2017
Registration closes: Wed, Nov 8 @ 11:59PM

About the CV 50/50

The Colossal Vail 50/50, presented by Fleet Feet Sports-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, 2015, and 2016.  Every finisher will get an award.  We used laser etched black Mexican river rocks in 2015 and 2016, but we're changing up to something new this year. 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) Ranch.  The 50 mile entrants continue on, to be met at the north turn around by volunteers with water 1.25 miles from the boundary of Saguaro NP at N Colossal Cave Pl.  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 major sponsor Cirrus Visual Communication will keep an eye on everyone.  At 11:00 AM while the adults are out on the course, we’ll have a free 1 mile run for kids and families.  There will be good food and drink at LPQ, with a party into the night for those who hang around. Food and drink are complimentary for runners and volunteers, available for purchase by family and friends.

While the course is fast, it’s also long. There will be no question of your accomplishment.  The 50K is actually close to 55K (33.85 mi.).  This year, the 50 Mile is "only" 50 miles, since we've adjusted the turnaround. 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, and profits 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 drop a note to Angela Greynolds, volunteer coordinator, at


Early Entry Discount January 20th to February 28th-- 50M $115, 50K $80
March 1st to July 31st-- 50M $125, 50K $90
August 1st to September 30th-- 50M $135, 50K $100
October 1st to Nov. 8th-- 50M $145, 50K 110
Registration Closed Midnight Wed. Nov. 8.

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.

50 K Training Program

Fleet Feet Sports- Tucson, our presenting sponsor, has created a training program geared for people wanting to attempt their first 50 K race. The details are on our Arizona Trail Association event website--

Local time: 9:27 AM


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