We cannot thank our fantastic runners, volunteers and sponsors enough for making this years race a success.  Stay tuned for much more on the website, Facebook, local and national media and running publications – below is a quick recap and some highlights from this years race.

One of my close friends and a 100 mile competitor this year said it best in a message to me after the race (paraphrased) “I haven’t felt this alive in a long time, … Thank you, man, it’s like family down there, Zumbro has the energy of the Oracle and the Ibex, the blood, sweat , tears of you and the volunteers – thank you.”

100 Mile:
47 Registered, 44 Starters, 30 Finishers = 68% Finishers Rate
Mens / overall winner was Bob Gerenz, 44 of Coon Rapids, MN with a new course record of 21:16:04
Womens winner was 4 time Zumbro 100 winner Susan Donnelly, 49 of Oak Ridge, TN in a time of 30:10:06 – Susan has run and won every Zumbro 100 to date
The 100 ended in a sprint finish with Matt Aro finishing just 2 seconds behind Bob Gerenz – this may be one of the closest 100 mile finishes ever
Bob Gerenz (1st Place), Matt Aro (2nd Place) and Joe Boler (3rd Place) all broke the previous course record on the new, tougher / revised course.
Youngest 100 Mile Finisher was Logan Polfuss, 5th overall in 26:08:21
Oldest 100 Mile Finisher was Alan Holtz, 13th overall in 30:07:02
Rick Bothwell finished in 33:58:39 and Anjanette Arnold 33:59:33 both finished just under the 34 hour cutoff by a small margin making for an exciting end to the race
A good portion of the Sandor family started the 100 mile race together – an awesome trend we hope to see continue


50 Mile:
62 Registered, 55 Starters, 39 Finishers = 71% Finishers Rate
Womens and OVERALL winner was Becky George, 29 of Baxter, MN with a time of 9:30:32
Mens winner (2nd overall) was Joseph Altendahl, 30 of Minneapolis, MN with a time of 9:56:39
3rd overall in the 50 was Pam Nielsen – 2 women in the top 3 – awesome
The oldest 50 Mile Finisher was Tony Oveson, 65 of International Falls, MN – this was after volunteering the two days before and lifting thousands of pounds worth of water jugs.


About 80 volunteers made this years race possible.


Best of luck to all the 100 mile finishers who continue in the Gnarly Bandit Ultra Series.




Zumbro Endurance Run
100MI, 50MI, 17MI Trail Race(s)
Theilman, Minnesota
April 10 & 11, 2020
• 100MI Friday 8:00AM
• 50MI 12:01AM Saturday (Friday Midnight)
• 17MI 9:00AM Saturday

Opens Fri Nov 1, 2019 – 12:01AM CST
Closes Fri April 3, 2020 – 11:59PM CST
*Or once the field limit has been met
Complete Registration Details HERE

Directions to Race Start:
Zumbro River Bottoms Management Unit
West Assembly Area
(Near Theilman, MN)
Google Maps Directions HERE
Written Directions HERE
(Approx 1:45 south of Minneapolis, MN)

The course consists of a mix of rugged single and double track trail with rubble, loose rock and sand along with minimum maintenance gravel roads.  The race is primarily concentrated in two large valleys within an expansive hardwood forest.  There are four significant, short, steep climbs (approx 300FT) per loop with small hills in-between along with some significant stretches of flat valley floor running.  Be sure to see maps, elevation charts and stats provided on this website HERE.

100 Mile:
6 x 17 mile loop = 102(ish) miles
Elevation Gain 13,500 FT
Elevation Loss 13,500 FT
NET Elevation Change 27,000 FT
17 Aid Stations
34 hour time limit
Complete 100MI Info HERE

50 Mile:
3 x 17 mile loop = 51(ish) miles
Elevation Gain 6,750 FT
Elevation Loss 6,750 FT
NET Elevation Change 13,500 FT
8 Aid Stations
18 hour time limit
Complete 50MI Info HERE

17 Mile:
17 Mile Loop
Elevation Gain 2,250 FT
Elevation Loss 2,250 FT
NET Elevation Change 4,500 FT
2 Aid Stations
9 hour cutoff
Complete 17MI Info HERE

More About the Area:
The Zumbro Endurance Run 100MI, 50MI and 17MI trail races take place within the Zumbro River Bottoms Management Unit in Southeastern Minnesota’s Bluff Country – just outside of the tiny village of Theilman, MN approximately 1:45 from Minneapolis – St.Paul, MN.  The races start and finish at the West Assembly / Horse Campground Area.  Generally speaking the Zumbro River Bottoms Management Unit lies within a portion of the Richard J. Dorer Memorial Hardwood Forest – an expansive 1.7 million acre tract of Minnesota hardwood forest on the Northern edge of the Driftless Region which is mainly characterized by its tall bluffs and deeply carved river valleys. This “bluff country” is rugged, hauntingly beautiful and provides the perfect venue for 100, 50 or 17 miles of trail running.