Arizona

Arizona's calendar runs almost backwards from the rest of the country. The desert lowlands around Phoenix and Tucson race heaviest from October through March, once triple-digit heat breaks, while high-altitude Flagstaff stays cool enough for summer trail events. Rock 'n' Roll Arizona draws thousands of runners across Tempe, Phoenix, and Scottsdale each January, and the Mesa Marathon runs a net-downhill course east of Phoenix in February. In December, the Tucson Marathon descends through the Sonoran Desert. For trail and ultra runners, Flagstaff's Cocodona 250 has become one of the sport's marquee events.

Browse the calendar below, filter by distance or month, or jump to a city.