Race Discovery
Backyard Ultra

Backyard Ultra

Princeton, Massachusetts, United States View on map
Sep 26, 2026 (America/New_York local time)
Trail running

About this race

Get ready to run until you drop, because on September 26th at Leominster State Forest we're hosting our 2nd annual Backyard Ultra! 

What does that mean?

Every hour, runners must complete a 4.167 mile loop - a yard - until they can't. That's it! If you don't make it to the starting line at the turn of the hour, you're out! Once a final runner runs a yard alone, the race is complete.

Whether you want to push yourself to your limits, mingle with new runners, or just want an excuse to be in the woods for a Saturday, you'll be in the right place.

We will provide some light snacks, drinks(water, Gatorade, etc.), a porta potty, and a canopy (or two) for shade. Suggestions on what to bring include camping chairs, picnic blankets, your own food and water, a hat, first aid supplies, and a change of clothes. Additionally, you must wear blaze orange during the race, as we are in hunting season and the neighboring property is hosting a hunting event during a portion of our race.

The race begins at 10:00 AM so please arrive between 9-9:30 to allow for check-in and prep. Entry Fee: $35. If you sign up before August 31st, you'll also get a t-shirt!

Pick your distance

Trail running

2026 Backyard Ultra Marathon

Get ready to run until you drop, because on September 26th at Leominster State Forest we're hosting our 2nd annual Backyard Ultra!  What does that mean?      Every hour, runners must complete a 4.167 mile loop - a yard - until they can't. That's it! If you don't make it to the starting line at the turn of the hour, you're out! Once a final runner runs a yard alone, the race is complete. Whether you want to push yourself to your limits, mingle with new runners, or just want an excuse to be in the woods for a Saturday, you'll be in the right place. We will provide some light snacks, drinks(water, Gatorade, etc.), a porta potty, and a canopy (or two) for shade. Suggestions on what to bring include camping chairs, picnic blankets, your own food and water, a hat, first aid supplies, and a change of clothes. Additionally, you must wear blaze orange during the race, as we are in hunting season and the neighboring property is hosting a hunting event during a portion of our race. The race begins at 10:00 AM so please arrive between 9-9:30 to allow for check-in and prep. Entry Fee: $35. If you sign up before August 31st, you'll also get a t-shirt!

Sep 26, 2026 2026 Backyard Ultra Marathon 10:00 AM
$35.00
Open

Course

Route map and elevation profile

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.

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Different organizers, within 40 miles, in the next three months

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, 5 Princeton events

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