Cobscook Backyard Ultra

  • Date Sat 28th March 2026
  • Time 9:00AM EDT
  • Location Edmunds Twp, Maine
  • Price $16.90
  • Races 4 races
  • Distances Ultra

Event summary

Get ready for an exhilarating day of running at the Cobscook Backyard Ultra on Saturday, March 28, 2026! Taking place in the stunning Cobscook Bay State Park in Edmunds, Washington, this unique event invites participants to conquer either a thrilling 50K or a challenging 50-mile race. Runners will tackle easy loops of 5 kilometers or 4.167 miles, making it a perfect opportunity for both seasoned athletes and newcomers alike to experience the joy of ultrarunning in a supportive and friendly environment.

Join a fantastic community of runners as you aim to complete as many laps as possible within a set time frame. Whether you choose to go solo or team up with friends to share the distance, the Cobscook Backyard Ultra promises an unforgettable day of camaraderie and personal achievement. Don’t miss out on this chance to push your limits while enjoying the beautiful natural surroundings! Sign up now and prepare for a memorable adventure on March 28!

Organiser's Description

COBSCOOK BACKYARD ULTRA - 50K OR 50 MILES. SATURDAY 28 MARCH*

THE EVENT: Come and run an easy 5 Km or 4.167 mile (6.706 Km) loops - just a stroll in the Park! If you want to spend Saturday in the beautiful Cobscook Bay State Park running and walking your first, or a different kind of, 50 Km or 50 mile Ultra with a great group of people, then why not sign up and join the fun? Or bring 1 or more friends and split the distance between you as a team entry.

INCLEMENT WEATHER/CONDITIONS: in the event of ice, snow or inclement weather the alternative event date is SATURDAY APRIL 4 OR 26, will do our best to announce a date change if necessary as soon as possible

If you can run/walk 3.1 miles in 1 hour then do it again next hour, and then again for 10 laps/hours in total, then you can finish a 50K in 10 hours. Or if you don't think you can do it all alone, find a friend or two and divide it up as a Relay Team of 2 or 3, just so long as one team member completes each lap.

OR RUN/WALK 4.167 miles each hour over and over again for 12 laps/hours in total for a 50 miler. Again, do it as an individual or as a Relay Team of 2 or 3, just so long as one member completes each lap.

THE COURSE is on vehicle free park gravel roads and will be well marked with arrows at every intersection. The 4.167 mile loop will overlap with the 5K loop for the most part with an additional 0.57 Km out and back to make up the difference.

COURSE MAP 50K CLICK HERE [https://www.strava.com/routes/3070104491313878616]- 50K GPX FILE [https://drive.google.com/file/d/1YuDlLiQ9zHhHpLJQKUvrlNgb5Qgsr2YP/view?usp=sharing]

COURSE MAP 50MI CLICK HERE [https://www.strava.com/routes/3070104928624590886] - 50MI GPX FILE [https://drive.google.com/file/d/1D_RyXgJGQf73rTafTSb7fILeKxWM3BhM/view?usp=sharing]

WELL FOLLOW MODIFIED BACKYARD ULTRA PROTOCOLS starting at 9am 50 KM RUNNERS will do one 5 Km loop, then do the 5K loop again at 10:00am, then again at 11:00am etc. through to starting the last lap at 6:00pm for 10 x 5K = 50K. When you finish a lap you'll likely have time to spare before the next one starts, so take a break, grab a drink/grub and wait for the next hour to come round. We will have a 5 minute warning bell before the start of the next lap. If you are not on the start line on the hour, because you havent finished the last lap or you've fallen asleep or whatever, then you are finished at however many loops you have completed. The event ends after 10 hours so the furthest you can go is 50kms.

50 MILE RUNNERS will start earlier, at 7:00am and do a 4.167 mile loop, then do it again at 8:00am, etc. as with the 50 K runners - every hour and starting the last lap at 6:00pm alongside the last lap for the 50 K runners.

TEAMS - in addition to individuals we will allow teams of 2 or 3 runners to compete. So long as one of your runners is on the start line on the hour, and completes the loop, your team can continue. This means you can participate without having to run all 10 laps, or even if you need to run off to do something else for a couple of hours. It's up to you to organize your team.

Note: if there is competition for places we will give first priority to individual runners, second to 2 person teams, and lastly to 3 person teams - so yeah, we're encouraging you to think big and ambitious - get out of your comfort zones!

TIMING: Well have a clock and a timing sheet on-site write down your own loop times.

NOT QUITE A FATASS STYLE EVENT while largely a Fatass style event - no aid stations, no support, no medals or awards, just satisfaction for you (or your team) in completing the distance and a great sense of camaraderie as we all push ourselves, we do ask for a non-refundable donation of $15 to cover park entrance fees and some of our other basic costs.

YOU SHOULD BRING your own supplies, canopy, chairs, etc. be prepared for the weather conditions. Also, please consider bringing something to share - we'll put out a shelter and table for this. There are multiple outhouses along the course but no running water or showers.

Because the park is closed to vehicles until 15 May you will have to park outside the park gate on South Edmunds Rd. and carry your stuff from there to the Start/Finish area where well all set up its about 300 meters. You can bring a cart or wheelbarrow. Please do NOT block the park entrance.

Races

  • Solo Backyard 50k

    Incl. $1.90 Fee

    Sat 28th March 2026 (9:00AM EDT)

    $16.90

    OPENS 17 JAN 26
    Participants who wish to cover the 50k distance solo following the Cobscook Backyard format.
  • 2/3 Person Backyard Relay 50k

    Incl. $1.90 Fee

    Sat 28th March 2026 (9:00AM EDT)

    $16.90

    OPENS 17 JAN 26
    Participants who wish to cover the 50k distance as a 2 or 3 person relay following the Cobscook Backyard format. Relay team members can run as many or as few laps as they would like just so long as one team member is running on every lap!
  • Solo Backyard 50 Mile

    Incl. $1.90 Fee

    Sat 28th March 2026 (9:00AM EDT)

    $16.90

    OPENS 17 JAN 26
    Participants who wish to cover the 50mi distance solo following the Cobscook Backyard format.
  • 2/3 Person Backyard 50 Mile

    Incl. $1.90 Fee

    Sat 28th March 2026 (9:00AM EDT)

    $16.90

    OPENS 17 JAN 26
    Participants who wish to cover the 50mi distance as a 2 or 3 person relay following the Cobscook Backyard format. Relay team members can run as many or as few laps as they would like just so long as one team member is running on every lap!

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Location

Cobscook Bay State Park Road (off South Edmunds Rd), Edmunds Twp, 04628, ME, United States

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