Ultra Running Hub Seattle, WA, United States · Saturday, April 18, 2026
Cottontail 12 Hour Race
We hold no course length for this race — a timed or backyard event is measured by the clock, not the kilometre — so there is no Grit score to give you.
What the course asks
DUV results for the 2026 edition (12h) — ranked runners only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, April
Regional 2001-2020 average for April — NASA POWER, grid elevation 110 m. Not a forecast.
Results history
| Year | Race | Finishers | Men's winner | Women's winner |
|---|---|---|---|---|
| 2026 | 12h | 9 | Bradley Petersen · 65.226 km | Jill Hudson · 62.120 km |
| 2025 | 12h | 9 | Carlos Jauregui · 70.312 km | Deanna Kytonen · 79.388 km |
| 2024 | 12h | 17 | Ryan McKnight · 86.840 km | Amanda Rasmussen · 58.515 km |
| 2023 | 12h | 9 | Kevin Bodle · 77.650 km | Hideko Opperman · 70.939 km |
| 2022 | 12h | 3 | Thomas White · 86.985 km | — |
| 2019 | 12h | 20 | Alex Swenson · 81.625 km | Rachel Entrekin · 93.181 km |
| 2018 | 12h | 10 | Patrick Burpee · 90.944 km | Mary Ann Mason · 61.991 km |
| 2017 | 12h | 12 | Shawn Bussert · 95.788 km | Kember Greco · 66.465 km |
| 2016 | 12h | 9 | Todd Hunsdorfer · 83.862 km | Kelley Scholz · 78.020 km |
| 2015 | 12h | 5 | Alex Swenson · 98.894 km | Christy Hammond · 62.989 km |
The field has held steady: 9 in 2025, 9 in 2026. 56% of the 2026 field were women.
DUV results for the 2026 edition (12h) — ranked runners only. Starters are not published, so the field was at least this big and no finish rate can be given.
The Aid Station
Course-specific beta from the community
With road terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for this road race with 131 m of ascent.
- Trail Running Shoes Cushioning on road that is still there in the last quarter.
- Race Nutrition Self-supported fuelling between aid stations.
- Hydration Vests Flask capacity without the bounce.
- Headlamps A 12 h limit puts you out there after dark.
- GPS Watches Battery life first — an ultra outlasts most full-GPS modes.
Overview
The Cottontail 12 Hour Race, a timed event in Seattle, WA, is a road race on a loop shorter than 5 kilometers. Runners have 12 hours to complete as many loops as possible, with 131 meters of elevation gain across the entire duration of the race. This makes it a course with minimal climbing, as the gain is spread over 12 hours of running.
With 10 editions since 2015, this race has been a consistent fixture in April. As a timed race, the challenge is to maintain pace and accumulate distance over the full 12-hour period rather than finishing a set course length. The format provides a different strategic challenge compared to distance-based events.
Similar races
Other road ultras of the same format.