Runners start the Triple D Winter Race Half Marathon course in Durango, and from there enter the Heritage Trail. This smooth, compacted crushed gravel trail stretches some 26 miles between Dyersville and Dubuque, and the 13.1-mile route will keep runners on it for the entire race, turning around just north of Graf before returning to the finish line back in Durango.
(MORE: Triple D Winter Race Marathon & Half Marathon event details)