Lilac Bloomsday 12K
Lilac Bloomsday 12K race day weather
Cool start, mild finish
Runners will face a temperature range from 52°F at the start to 56°F at the finish, with a light SSW wind peaking at 9 mph. With humidity at 44%, conditions are favorable for maintaining pace. However, runners should be mindful of crosswinds in the early miles and a headwind in Mile 6, adjusting their effort accordingly. Pre-race temperatures feel as low as 40°F, so a light layer may be beneficial before the start.
Pace Calculator
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Lilac Bloomsday 12K route and elevation
The Lilac Bloomsday 12K course has about 354 ft (108 m) of climbing and 383 ft (117 m) of descent, a net drop of about 29 ft (9 m). The hardest mile is mile 5, with 118 ft (36 m) of climbing.
Biggest climbs
- Miles 1.6 to 1.9: climbs about 75 ft (23 m).
- Miles 2.4 to 2.9: climbs about 85 ft (26 m).
- Miles 4.7 to 5.7: climbs about 150 ft (46 m).
What the hills cost
- 1:05:00 on a flat course is about 1:06:00 here (1:00 slower).
- 1:10:00 on a flat course is about 1:11:05 here (1:05 slower).
- 1:15:00 on a flat course is about 1:16:10 here (1:10 slower).
Hills only, priced mile by mile on the course map. The pace calculator above adds the race-day weather.
Even-effort splits for a 1:05:00, 1:10:00 or 1:15:00 finish
| Mile | Climb | Descent | 1:05:00 | 1:10:00 | 1:15:00 |
|---|---|---|---|---|---|
| 1 | 23 ft | 22 ft | 8:41 | 9:21 | 10:01 |
| 2 | 75 ft | 149 ft | 8:23 | 9:01 | 9:40 |
| 3 | 87 ft | 32 ft | 9:10 | 9:53 | 10:35 |
| 4 | 24 ft | 38 ft | 8:37 | 9:17 | 9:57 |
| 5 | 118 ft | 115 ft | 8:42 | 9:22 | 10:02 |
| 6 | 35 ft | 8 ft | 8:55 | 9:37 | 10:18 |
| 7 | 3 ft | 10 ft | 8:39 | 9:18 | 9:58 |
| Last 0.5 | 7 ft | 29 ft | 3:53 | 4:11 | 4:29 |
Explore the Lilac Bloomsday 12K course with the weather and your pace along the route, or compare it with other races.
About the Lilac Bloomsday 12K
The Lilac Bloomsday 12K is a 12-kilometer (7.46-mile) road race held in Spokane, Washington, on the first Sunday in May. Runners start in color-coded waves on Riverside Avenue downtown, and the course mixes hills with flat stretches through the city. It is one of the largest timed road races in the United States, with 32,207 finishers in 2025, and is part of the PRRO Circuit of classic road races. Source
