Logo

Mines Of Spain 100 - Dubuque, IA

Dubuque, United States • 17-18 Oct 2025

Mines of Spain 100, held in Dubuque, Iowa, offers 100-mile and 100-kilometer ultramarathons on October 17-18, 2025. Set in the driftless region’s bluffs, prairies and forests above the Mississippi River valley, it delivers a true Midwest trail experience. The course is described as a ~20‑mile loop featuring a mix of steep technical single-track, wide rolling dirt, and prairie double-track with additional scenic sections, designed to challenge and inspire runners of all levels—likely repeated to reach the 100‑mile/100‑km distances. The event emphasizes a grassroots, well-organized feel, supports area trail groups, and donates proceeds to Mines of Spain park for trail maintenance. Visit the organization's website for the most recent information.

United States Iowa Dubuque

Race information

Website
100 mi
100 Mile
100 km
100 Kilometer
Visit the organization's website for the most recent information.
Trail runs nearby

Swiss Valley Trail Races

Peosta - 10 mi from Dubuque

The Swiss Valley Trail Races, held in Peosta, Iowa, offer runners three distance options: 5.2 miles, 25K, and 50K. Set within the scenic Swiss Valley Nature Preserve, the course features rugged terrain, creek crossings, and steep inclines, with each 5.2-mile loop climbing approximately 875 feet. The..

Haunted Heritage Trail Fun Run

Dyersville - 23 mi from Dubuque

The Haunted Heritage Trail Fun Run / Hero Walk in Dyersville, Iowa, offers a festive and spooky running experience with multiple events including a 5K Haunted Heritage Trail Fun Run, a 10K Trail Run, and a 1 Mile Hero Walk. Participants are encouraged to wear Halloween costumes as they navigate a 3...

Miner 49er

Dubuque

The Miner 49er is an endurance running event held in the scenic Mines of Spain near Dubuque, Iowa. It features two race distances: a 25K and a 50K, with the 50K being a double loop of the 25K course. Runners experience approximately 2,200 feet of elevation gain on the 25K and 4,400 feet on the 50K...

Galena Sky Trail Races

Galena - 13 mi from Dubuque

Galena Sky Trail Race is held at Chestnut Mountain Resort in Galena, Illinois. It features two timed loop formats: an 8-hour loop and a 4-hour loop on the resort’s trails that climb the same hills skied in winter, offering views of the Mississippi River and the Iowa–Wisconsin shores. The long loop i..