Registration Information

We are both excited and humbled to be moving forward with a modified Zumbro event this year. To be sure, this will be unlike any Rocksteady Running event you have been too over the past few years. As I first envisioned, and then started planning this year’s Zumbro, it dawned on me that it will likely be really similar to what the first (official) Zumbro was like back in 2009 – really quiet, really low key, and of course super challenging and fun.

We have worked tirelessly with our permitting agencies to come up with a plan that will allow us to host a safe event. In the spirit of full transparency, our Covid 19 Preparedness Plan, Event Logistics Plan and Participant Guide are all one in the same – you will find the link below.  It is a LOT of reading (about 15 minutes), but it is super important. Here is the deal we are asking that you make with us… if you want to come and run at Zumbro, then you will read the entire document, so we are all unified in one common goal… having a safe and fun event, that respects where we are at today – improving but still not out of the woods. We want you to know that we did not make the decision to pursue a permit for this event lightly. The opportunity before us, to hold a modified event, is firmly rooted in solem recognition of all that we have all been through this past year, those we have lost, and the unique struggles and challenges that we have all faced. Let us not forget, but, at the same time, let’s enjoy a special, life-affirming day in the woods together – over more days, in smaller numbers and at a safe distance of course.

Complete details about the 2021 Zumbro event can be found HERE should you be interested in participating

Registration for the 2021 event will open on Friday March 12, via a special email invitation for those who were registered for and affected by the Zumbro cancellations in 2018, 2019 and 2020 – the invitation will be sent to the email address that you used to register for Zumbro in 2018, 2019 and / or 2020. If your info has since changed, please contact us and we will send you and invitation to your new email address. Any remaining spots will be made available for everyone else on Friday March 19, 2021 at 12:01AM CST on a first come first served basis. Registration will close on Wednesday March 31, 2021 at 11:59PM CST or once the field limit has been met. Please note that in order to not charge registrants up front, we are leveraging the built in ‘waitlist / lottery’ functionality within UltraSignup. Registration for each wave is on a first come first serve basis, but once you successfully register for an available wave, you are guaranteed that spot.  Your registration confirmation will make reference to ‘waitlist / lottery’ but all this means is that we will not be charging your card until Wednesday April 7, one day before the four day event commences.

Review our cancellation and refund policy prior to registering



The Zumbro Endurance Run 100M, 50M, 34M & 17M race(s) will be held on Friday April 8 and Saturday April 9, 2022. We are currently in the permitting process and will update the website with the 2022 event details later this Fall. We are targeting January 1, 2022 as the registration open date. If you are not already on our mailling list, you can sign up to receive updates Please note that our email list is for all of the Rocksteady Running events, not just Zumbro. 

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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.