Mines of Spain 100
About this race
Welcome to the Mines of Spain 100! This is a true Midwest trail race set in the beautiful bluffs, prairies and forests of the driftless region of eastern Iowa amongst the scenic setting of the Mississippi river valley! The race is held on a ~20 mile course comprised of a wide variety of terrain that will both challenge and inspire runners with its eclectic mixture of steep technical single track, wide rolling dirt and prairie double track with a multitude of other fun and scenic sections mixed in! This is a course designed to be equally suitable for first timers or veterans alike.
Our mission is to provide an ultra-marathon event that is grassroots in feel yet meticulously organized with every effort being made to provide the most rewarding experience for the runners, their crews, race volunteers and every single person involved. Our continued year-round goal is to support the area trail organizations and groups that oversee the Mines of Spain in whatever capacity we can including a substantial financial contribution from the race proceeds going directly to the park to aid in funding for future trail maintenance and projects.
Thank you and we hope to see you at the Mines in October!
Pick your distance
Trail running
100 Mile
100K
Typical race-day weather
Based on 1 year of Open-Meteo archive data for this event's race dates in Dubuque, plus the 3 days either side.
The sun rises at 7:17 AM and sets at 6:19 PM local time (CDT) in Dubuque on October 16, 2026 — 11h 02m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Results — Mines of Spain 100
Other races near Dubuque
Different organizers, within 40 miles, in the next three months
Blue Bowling 4 Boobs-Dubuque
Turkey Trot at Wahlert High School
Galena River Fall Half Marathon & 8k
Monster Dash 5K Run/Walk
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 7 Dubuque events
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