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 scheduled for October 16, 2026, in Dubuque, Iowa, organized by Sun Trail Running. The event uses Louis Murphy Park as the start and finish area and runs primarily inside the Mines of Spain Recreation Area.
The course is a marked loop of roughly 20 miles that runners repeat for each distance. Trails include dirt, grass, and rock surfaces with a few short paved connectors. The route passes Horseshoe Bluff, grass prairies, hardwood forests, and multiple overlooks of the Mississippi River. Trail terrain varies from steep and technical to flat single track and rolling grassy sections.
Distances
- 100 mile five loops, about 14,000 ft elevation gain
- 100 kilometer three loops, about 8,400 ft elevation gain
Time limits are stated as 33 hours for the 100 mile and 23 hours for the 100 kilometer. Packet pickup is scheduled on the days before the race; camping or runner setup is not allowed Thursday evening. Runners may switch distances before the deadline one month out; switching up requires paying the difference. A waitlist is used once the field is full. The race publishes refund and deferral rules with deadlines (including full deferral or partial refund options by June 30 and further deferral options through August 31) and does not allow bib transfers. The race may modify or cancel the course for safety or trail conditions; in those cases registration fees are not refunded.
Mile 90 Photography will provide event photos available free to runners. The event is part of the No Coast Trail Series. Visit the organization's website for the most recent information.
