⏵ Course guide · Doomsday Hill waits at mile 4.75
Bloomsday runs rolling through Spokane, building to the famous Doomsday Hill past the halfway point of this 12K. I will walk you through the course and the hill first, then give you a pacing plan built for its timing, plus free tools to dial in your own numbers.
These facts come from bloomsdayrun.org. No explicit 2027 calendar date was published on the pages we could fetch; the date above is computed from the race's own stated first-Sunday-in-May rule. Confirm on bloomsdayrun.org.
The route winds through Spokane and finishes downtown, with one genuinely famous climb along the way.
At roughly mile 4.75, past the halfway point of the 12K, the course climbs about 0.72 miles at an average grade near 3.8%. Runner's World has called it one of the country's "sublime climbs," and the costumed "Doomsday Hill Vulture" waiting at the base has become part of Bloomsday tradition. It is a genuine test, arriving exactly when fatigue is starting to build.
With 36,000 to 44,000 runners in a typical year, Bloomsday is one of the largest timed road races in the country. The color-coded seeded wave start keeps that scale manageable, but expect a busy course throughout, part of the event's energy and its 50th anniversary tradition.
The single biggest pacing decision at Bloomsday is how much you have left when Doomsday Hill arrives.
Do not try to build a time cushion in the early rolling miles at the cost of your legs. A grade-adjusted pace target for Doomsday Hill keeps your effort honest, and arriving at the base with something in reserve matters more here than shaving a few seconds off your early splits.
⏵ Free tools to pace this course
⏵ Train for it with Summit Line
Get a race-day plan built around YOUR fitness and this exact Doomsday Hill profile. Summit Line reads your real training, builds a plan for the climb, and helps you dial in race-day pacing so race day is something you execute, not guess at.
The course's defining feature: a climb of roughly 0.72 miles at an average grade around 3.8%, arriving near mile 4.75, more than halfway through the 12K. It is famous enough that Runner's World has ranked it among its "sublime climbs," and the costumed "Doomsday Hill Vulture" greets runners at the base, which tells you everything about how seriously the event treats it as a landmark rather than just an obstacle.
Respect its timing more than its steepness. It arrives late enough in the 12K, past the halfway point, that accumulated fatigue makes a moderate grade feel harder than the numbers suggest. Use a grade-adjusted pace target so you approach the base of the climb with something left, rather than discovering you have nothing to give right when the hill starts.
Runners start in color-coded waves and corrals seeded by predicted pace, similar in spirit to a marathon corral system but organized by color group rather than a single time-seeded queue. Register with an honest predicted time so your wave placement matches your actual pace, which keeps the race flowing well for everyone around you.
Large: roughly 36,000 to 44,000 participants most years, making it one of the largest timed road races in the country. That scale, combined with the seeded wave start, means the course stays busy the whole way, which is part of the event's energy but also something to plan around if you are trying to run your own pace early on.
Early May in Spokane brings cool Inland Northwest spring conditions, typically in the 50s Fahrenheit, but the weather can swing toward wet or unexpectedly warm depending on the year. Check the forecast in race week and be ready to adjust your layers and pace expectations either direction.
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<a href="https://runsummitline.com/guides/bloomsday-run">The Bloomsday Run course guide</a><iframe src="https://runsummitline.com/embed/race/bloomsday-run" style="width:100%;max-width:420px;height:180px;border:0;" loading="lazy" title="Bloomsday Run course guide by Summit Line"></iframe>This guide is independent and for planning only. The course details and dates come from public sources and can change year to year, so confirm the current specifics with the official race before you register or run. The pacing advice is general and not medical advice.