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His head was focused on the 26.2 miles before him. But as Jemil Kassahun toed the line for the start of the American Discovery Trail Marathon, his heart was elsewhere. He wanted to run a qualifying time for the Boston Marathon. And he nailed it. Kassahun, 18, a student at the University of Colorado, ran from Palmer Lake to America the Beautiful Park in Colorado Springs to win the ADT Marathon in 2 hours, 50 minutes, 21 seconds.

Aug. 19 and 20 marked the 35th annual Blueprint for Athletes Leadville Trail 100 Run, presented by New Balance. More than 600 runners from all 50 states and 35 countries came to Leadville, Colo., to compete in the iconic ‘Race Across the Sky’ and run 100 miles through the challenging Colorado Rockies terrain with elevations ranging from 9,200 to 12,600 feet, with a total elevation climb of more than 14,000 feet.

The Kahtoola Stage Four route from Nova Guides to Red Cliff totaled 14.5 miles (23.3km) and 2,800 feet (854 meters) of elevation gain. After leaving Nova Guides, runners had to climb uphill on very steep terrain for two miles making this stage a real leg burner. At 8 a.m. the RUN6 runners and crew that wanted to run left Nova Guides with the traditional AC/DC's Highway to Hell song blasting while spectators cheered them on.

Hundreds of runners and mountain bikers flocked to Steamboat Springs for the 7th Annual Steamboat Stinger. The mountain biking events took place on Saturday and the trail running events took place on Sunday, with titles on the line for the top male and female finishers in each day's headlining events.

A new course record at the Speedgoat 50k! We're talking about Anna Mae Flynn, and celebrating her breakout summer with the July "The Runner Box" Colorado Runner of the Month award. She chats with us about Speedgoat, her rise to the top of the sport, and what's coming up.

It was back in May that Boulder's Timothy Olson returned to world-class form, winning the Ultra-Trail World Tour Penyagolosa Trails 115k in Spain. Since then, he's been frequently travelling and it was just now that we were able to connect. For that UTWT win, we named Olson the "The Runner Box" Colorado Runner of the Month.

Josiah Middaugh and Lesley Paterson captured the ninth-annual XTERRA Beaver Creek Championship race elite titles on a picture-perfect morning in the Rocky Mountains surrounding Avon, Colorado. The win is Middaugh’s fifth straight here on his home course (he lives a mile from the start line) and his third in a row on the XTERRA Pan America Tour this year. For Paterson, the two-time XTERRA World Champ, it’s her first XTERRA victory of the year and in her first try on this course.

The Silver Rush 50 Mile Run kicked off under cool temperatures and clear conditions, warming up throughout the day as an almost cloudless sky played background to the towering mountains of Leadville, Colorado.

Hot weather and the snow, mud, and water remnants of a 100-year winter event in California’s Sierra Nevada worked together to create difficult racing conditions for the 2017 Western States 100. […]