Registration Open for All 2022 Events!

Registration is now open for all five events in the 2022 Arizona Trail Endurance Series. Whether you prefer to run or ride, we’ve got some outstanding adventures lined up for the year ahead. We hope you can join us for one or more of these events (from 10K to 100 Miles), all of which benefit the Arizona Trail Association and our mission to protect and maintain the AZT!

Colossal Vail 50/50 T-Shirt Unveiled

Thanks to the talented designers at Cirrus Visual Communications, we are excited to share the 2019 T-shirt for the Colossal Vail 50/50 presented by Fleet Feet Sports – Tucson. The image celebrates the rattlesnake mural that all participants will run through in the 50-Mile, 55K and Half-Marathon distances on November 9. Created by Ed Muren, this mural is the first art project to lively up the cement culverts the AZT utilizes to safely cross under roadways.

Registration is still open for the Colossal Vail 50/50, so sign up soon for this premier trail running event that benefits the Arizona Trail Association.

Half-Marathon Added to Colossal Vail 50/50

The Colossal Vail 50/50 presented by Fleet Feet Sports-Tucson isn’t just an ultra anymore! While running 55K or 50 Miles on the Arizona Trail remains at the heart of this event, we added a shorter distance for 2019 — the scenic and adventurous half-marathon features a segment of the Arizona Trail south of Colossal Cave Mountain Park as well as a sandy slog through a portion of Davidson Canyon. Runners will visit the aid station at Gabe Zimmerman Trailhead two times before their return to the finish line at Colossal Cave Mountain Park. The event is limited to only 100 runners. Register here.

Triple 50 Awards Fiesta

On May 11, ultra runners from throughout southern Arizona gathered at Borderlands Brewing to celebrate the 13 individuals who completed the Southern Arizona Triple 50 in 2017-18. Custom embroidered Salomon running jackets were given to all award recipients, along with a commemorative Triple 50 poster from Cirrus Visual Communication. Kevin Cross, the fastest person to complete all three 50-mile events, was also given a Royal Robbins polo shirt and an AZT mug.

The Southern Arizona Triple 50 has grown from 3 finishers in its first year to 13! Who’s up for the challenge in 2018-19? The first event in the series is happening on November 10.


Back row (l-r): Colossal-Vail 50/50 Race Committee Member Mike Duer; Julia Kemper (5th female); Arizona Trail Association Executive Director Matt Nelson; Deron Ruse (4th male); Wieke De Boer (4th); Rachel Dockender (2nd); Steve Greenwell (3rd); Kevin Cross (1st).

Front row (l-r): Old Pueblo 50 Race Director Bob Bachani; Oracle Rumble Race Director Steve Outridge; James Sinclair (7th); Nathan Warner (2nd); Robert Harris (8th).

Not pictured: Tonya Littlehales (1st); Holly Hovious (3rd); Trahern Jones (5th); Jason Butler (6th).