
Fox Hourglass Ultra is an ultra and running race on October 9, 2027 in Suamico, WI, with an entry fee of $145.
Welcome to the Fox Hourglass Ultra, a relentless test of mental grit, pacing, and pure endurance. There is no finish line in sight, no set distance, and no guaranteed end. There is only the top of the hour, the sounding of the whistle, and the next loop. We will follow the standard backyard ultra format with the exception of the time limit. Fox Hourglass Ultra is a max of 24 hours. The event continues until only ONE runner remains, max of 24 hours. If there are multiple participants for the final 24th hour, the winner will be determined based on who completes the final lap first.
Fox Hourglass Ultra is a standard backyard ultra format with the exception of the time limit (24 hours). It is a 24-hour event where participants run a 4.167 mile marked loop on the hour every hour. Each loop begins exactly one hour after the last. If the participant is not in the starting corral for the initial start, the participant is disqualified and receives a “Did Not Finish” (DNF). Each participant must complete the loop and be back at the starting corral within the hour in order to continue. If a participant fails to start or finish a loop within the allotted hour, the participant is out of the race and receives a DNF. Note, the event can end prior to the 24th hour.
Maximum number of participants is 40, so register early to secure your spot!
Course Details: Coming Soon...
Timing of Event Weekend:
Friday, October 8th:
Saturday, October 9th:
Sunday, October 10th:
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
61°
Typical Low
42°
Based on US Climate Normals data from Green Bay Botanical, 5 mi from the venue.
Nearest Airport
GRB
Austin Straubel International Airport · 9 mi
Major Hub
MKE
General Mitchell International Airport · 114 mi
Time Zone
Central Time
From Endurance Grid
Line up lodging and travel early to lock in your race weekend.
Every finish line starts with a single decision. Claim your spot at Fox Hourglass Ultra, put it on the calendar, and turn “someday” into a start date.
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This race spans more than one sport — here’s a guide to each, so you can understand what’s involved and decide if it’s the right fit. For course distances, logistics, and race-day specifics, always defer to the race organizer’s event page.
An ultramarathon is anything beyond the standard marathon — 50K, 50-mile, 100K, 100-mile, and timed events. Crossing the line is less about speed and more about not quitting.
From 5K to marathon, running races are an accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Fox Hourglass Ultra
Oct 9, 2027