Zumbro 100 Ultra Marathon

News and Updates

News and Updates

Welcome to the  Zumbro 100 Mile Endurance Run , the Zumbro Midnight 50 and 17 mile trail race. Join us on Friday April 8th and Sat. April 9th 2016 for the 8th annual running.


  • Interest in this years race is at an all time high.  Many of the other Spring 100’s in the country have filled and we expect Zumbro 100 to grow again this year.  Please register early.
  • Once again, the Zumbro 100 Mile Endurance Run will be the first 100 Mile race in the UPPER MIDWEST TRAIL RUNNERS (UMTR) WILDERNESS ATHLETE SPONSORED “GNARLY BANDIT ULTRA SERIES” – If you want to partake in the series and be in the running for the cash prize – you have to start at and finish the Zumbro 100.  Learn more HERE.  UMTR should be updating this information soon.
  • Please visit and use our sponsors – they are good people, companies and organizations that help to make the Zumbro races possible.
  • Run some and help at some – that is our philosophy, simple as that.  We are always looking for Volunteers, its a good thing to do and its a lot of fun.  If you are interested in giving a day of your time – please contact us!
  • As always, if you have any questions, please explore the site, most everything you will need you can find here, if you still have questions, please contact us – we look forward to seeing you on race day.

Recent Posts

2013 Volunteer Thank You

Thank you to all of our wonderful volunteers for making the 2013 Zumbro Endurance Run a success. You can click the letter below to view a larger .PDF version.          

2013 Zumbro Recap

The 2013 Zumbro Endurance Run 100MI, 50MI and 26.2MI are in the books!  It should be of no surprise that when you have an early Spring race in Minnesota, eventually you will have one with some snow.  After a decade of snow-free trail-running in the Zumbro Bottoms this same weekend each year, it finally happened and in a big messy way. Leading up to this years...

Runner Updates 2013

  Zumbro Endurance Run | 100MI, 50MI, 17MI April 12th & 13th, 2013 Theilman, MN Do not reply to this email, please email questions to HERE You can visit the official Zumbro Endurance Run website HERE Welcome Runners! The Zumbro Endurance Run is quickly approaching, are you ready? We are super excited to have another very diverse and extremely well...

2013 Race Numbers

The Zumbro Endurance Run hosts three races simultaneously, the Zumbro 100 Mile Endurance Run (starts at 8:00 AM Friday) and the Zumbro Midnight 50 (starts at 12:01 AM Saturday) and the Zumbro 17 Mile (starts at 9:00 AM Saturday). Each distance will have its own unique race number (unique color and number series) so runners can be easily identified by race...

Zumbro 100 Mile Finishers Buckle v2013

The Zumbro 100 Mile Endurance Run finishers buckle has been redesigned for 2013.  Measuring up at 4″ wide X 3.5″ high, this thing is huge and will look great on your belt or on the shelf, dwarfing your other buckles.   It’s big, it’s metal, it’s heavy, it’s beefy – finish the 100 and its yours!

Two Seconds with Bob Gerenz – An Interview

Rarely does a race come down to a couple of seconds – never does a hundred.  In 2012, Bob Gerenz (then, relatively unknown in the Midwest ultra scene)  put his head down, kicked and kicked again and took the win – only two seconds separated him and the 2nd place finisher.  We threw a few questions at Bob about the exciting 2012 race as he prepares...

Susan Donnelly Interview

In 2012, Susan Donnelly of Oak Ridge Tennessee once again came and conquered the Zumbro 100 Mile Endurance Run.  Susan won the race for an unprecedented  fourth straight time and kept her amazing streak alive – being one of only two people to complete all four editions of the race.  Susan will return for “number 5” in 2013, purely for the love...

2013 Race Shirt

All for one and one for all… All 2013 Zumbro Endurance Run racers and volunteers will receive a high-quality long-sleeve technical t-shirt designed by John Storkamp / Rocksteady...