We will be updating this as frequently as possible and including times from 3 of the 4 aid stations (mile 10, 15 and 20 of each loop). This gives everyone the ability to see where a runner was “last seen” and at what race time elapsed. Please understand that this is for entertainment purposes only and does not substitute for official timing and results.


Mines of Spain 100
100 Miles
100 Kilometers
October 15-16, 2021
Dubuque, Iowa

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!

Joshua Sun – Race Director

Like us on Facebook and Follow us on Instagram!

Please email us at or message us on Facebook

A Sun Trail Running EventSun Trail Running_Pink_White Background_Copy

Proud member race of the No Coast Trail Series! (Facebook)NCTS_logo - Copy

The 2021 Mines of Spain 100mi (5 points) and 100k (3 points) are both UTMB qualifiers!


Our event is Trail Sisters Approved! Click on the badge to find out more!

TS Approved Badge_black_transparent

With support from:



NCTS_logo - CopyDD logologo

20% off your bag order with coupon code ‘MOS-2021’