Marsh Madness
- Date
- August 7–8, 2026
- Distance
- Marsh Madness
From the Organizer
Marsh Madness is a 32-hour ultramarathon on August 7th, 2026.
Free fat ass race run on the dikes at Point Mouillee State Game Area, where the Huron River, Detroit River, and Lake Erie converge. Views of Ontario and Ohio across the water await. On the western shores of Lake Erie, Pointe Mouillee State Game Area is one of the most respected waterfowl locations in Michigan. Consisting of 4,040 acres, it is one of the largest freshwater marsh restoration projects in the world. You may see an eagle or a random guy posing with a fish for his Tinder photo.
50 runners max.
You supply all of your own aid and nutrition.
Crew, pacers, and poles welcome.
Elevation gain is 69 feet per loop, 80% gravel, 20% asphalt.
Zero water crossings.
Temps should be in the 80s. Access to your vehicle every 8 miles.
Alternating loops of an 8-mile loop and a 4.6-mile out-and-back during the day. 4-mile loop between the hours of 11 pm and 4 am.
32 hours to complete, with the caveat that we can not run the dike between 11 pm and 6 am. A nighttime course is planned. Start time: 6 am Aug 1st; finish time: 2 pm Aug 8th.
No cut-off times.
It is free, so there are no awards other than the beautiful scenery and the sense of accomplishment.
No garbage cans.
Pack it in, pack it out.
Porta-potties this year on the 4.6-mile out-and-back.
We will meet at the start of the race, 30 minutes before, to sign in.
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
83°
Typical Low
61°
Chance of Rain
30%
Based on US Climate Normals data from Newport 4sse, 8 mi from the venue.
Host City
About South Rockwood, MI
Population
1,891
as of 2023
Elevation
585 ft
Nearest Airport
DTW
Detroit Metropolitan Wayne County Airport · 11 mi
Time Zone
Eastern Time
From Endurance Grid
A small town race. Lodging near the start could be limited, so book early.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at Marsh Madness, put it on the calendar, and turn “someday” into a start date.
Coming Up
More Running races near South Rockwood, MI
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Half Marathon · 8K · 5K
6 miles away
Wyandotte Firecracker 5k
5K
11 miles away
2026 Running To Honor 5K Walk (or Run)
5K
12 miles away
From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
- What is the Marsh Madness?
- Marsh Madness is a running race held in South Rockwood, Michigan on August 7, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the Marsh Madness?
- Friday, August 7, 2026 in South Rockwood, Michigan at South Rockwood, South Rockwood, MI. Check the event page for exact start times and wave schedules.
- How do I register for the Marsh Madness?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
Marsh Madness
Aug 7, 2026