Cobscook Backyard Ultra
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Event overview
The Cobscook Backyard Ultra is scheduled for Saturday, March 28, 2026, at Cobscook Bay State Park Road (off South Edmunds Rd), Edmunds Twp, ME 04628. The event offers individual and team options. Participants compete by completing repeated loops to reach either 50K or 50 miles. A non-refundable donation of $15 is requested to cover park entrance fees and basic costs.
Distances
- Solo Backyard 50K
- 2/3 person Backyard Relay 50K
- Solo Backyard 50 mile
- 2/3 person Backyard 50 mile
Course and format
The course consists of vehicle-free park gravel roads marked with arrows at intersections. The 50K format uses ten 5 km loops. The 50 mile format uses twelve 4.167 mile loops; this loop overlaps the 5K loop with an extra 0.57 km out-and-back. Participants follow modified Backyard Ultra protocols by completing one loop each hour; a 5-minute warning bell sounds before each lap. A runner or a team must have one member on the start line at the hour to continue. A clock and timing sheet will be on site for participants to record loop times.
Logistics and facilities
There are multiple outhouses along the course but no running water or showers. There are no aid stations, official support, medals, or awards. Participants should bring their own supplies, shelter, and chairs. Until May 15 the park is closed to vehicles, so parking is outside the park gate and gear must be carried about 300 meters to the start/finish area. Priority for entry is given to individual runners, then two-person teams, then three-person teams. Course maps and GPX files are provided. Visit the organization's website for the most recent information.