Mines Of Spain 100 - Dubuque, IA
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Mines of Spain 100 - Dubuque, IA
The Mines of Spain 100 is a trail ultramarathon held October 16, 2026 in Dubuque, Iowa, organized by Sun Trail Running. The event uses a marked loop of approximately 20 miles that starts and finishes at Louis Murphy Park and runs largely through the Mines of Spain Recreation Area and surrounding trails in the Mississippi River valley.
Course surfaces include dirt, grass and rock trails with a few short paved connectors at the beginning and end of each loop. The route passes viewpoints of the Mississippi River and traverses Horseshoe Bluff, prairies and hardwood forests. Trails vary from steep and technical sections to flat singletrack and rolling grassy segments.
Key course details:
- 100 mile - five loops of ~20 miles (≈14,000 ft total elevation gain)
- 100 kilometre - three loops of ~20 miles (≈8,400 ft total elevation gain)
Per-loop elevation gain is about 2,800 ft. Time limits are set for each distance: the 100 mile has a 33-hour limit and the 100k has a 23-hour limit. Entry fees are listed in a range for 2026, and registration has a published deadline of October 1. The race maintains a public waitlist when capacity is reached. Partial refunds and deferrals are available under stated deadlines and conditions; bib transfers are not allowed. The race is part of the No Coast Trail Series, and event photography is provided on site with photos available to runners. Visit the organization's website for the most recent information.
