The Micro: Breaking 4
About this race
A Race Series Designed by Runners, for Runners
In 2021 we created the McKirdy Micro Marathon series to help athletes run a personal best and qualify for the Boston Marathon or beyond. At the time, we were just coming out of the COVID-19 pandemic where opportunities to run fast times were limited and motivation to continue training was difficult with no races on the calendar.
In 2023, we took the same concept and applied it at an elite level, hosting a race for athletes targeting the USATF Olympic Trials Qualifying Standard (OTQ) or the Olympic Standard. Many “on the cusp” athletes find they have limited options for races that are both fast and will provide the support they need to run their best.
Athletes from all over the world came to participate in a small localized race with the potential for massive impact. When the day was done:
48 athletes ran under the 2:18:00/2:37:00 OTQ Standard
More OTQs came from our race than any other race in 2023
Our race produced 2 Olympians
69% of the finishing athletes ran a personal best
85% of the finishing athletes ran their second fastest lifetime marathon
Moving forward, we are expanding the series to bring the McKirdy Micro race experience to athletes of all abilities over multiple distances! We hope you’ll come run your fastest marathon with us.
Pick your distance
Running
The Micro: Breaking 4
Typical race-day weather
Based on 1 year of Open-Meteo archive data for this event's race dates in Walker, plus the 3 days either side.
The sun rises at 8:00 AM and sets at 6:55 PM local time (EDT) in Walker on October 18, 2026 — 10h 55m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Other races near Walker
Different organizers, within 40 miles, in the next three months
Hot Cider Hustle - Grand Rapids Half Marathon, 10K & 5K
West Side Donut Dash
University of Michigan Health-West Grand Rapids Marathon
myTEAM TRIUMPH West MI - GR Marathon -- Captain & Angel Registration
🏃 Plan Your Next Race in Walker
Find upcoming events by distance:
- Walker 5K Races 3 races
- Walker Half Marathons 2 races
- Marathons in Walker 2 races
- Walker Running Calendar 2026 5 races
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 7 Walker events
Spotted something wrong? Tell us and we'll fix it.