The XTERRA Arizona Trail Run Series is a premier 7 day event that hosts race distances from 5k all the way up to marathon distance and everything in between. Notably, the Estrella Mountain Trail Run offers a Marathon, Half Marathon, 12k, and 5k. Falling on December 17th, the Estrella Mountain Trail Run operates during one of the cooler months in Arizona, making for a refreshing and enjoyable race day. Offering beautiful scenary throughout, this course comprises views of surrounding mountain ranges, desert landscapes, and wetlands, all within Estrella Mountain Regional Park.