The 2026 Valleyfest River Run: 5K/10K returns to Spokane Valley, Washington on September 26th at 8:00 a.m., offering runners the chance to enjoy the scenic Centennial Trail. This year’s race will start and finish at Mirabeau Trailhead 1 across from CenterPlace Regional Event Center, situated off E Mirabeau Parkway. The setting is both familiar and inviting on race morning. The trailhead parking lot offers ample space for participants, with additional parking available at the YMCA nearby. As runners gather around the Mirabeau Trailhead at 7:00 a.m., they will be greeted by the cool September breeze that refreshes after a night of anticipation. For over a decade, Valleyfest has been celebrating local community and raising funds for scholarships through its annual races. This year marks their 14th run, with thousands participating in both the 5K and 10K events. The race not only brings together runners from all walks of life but also supports the educational aspirations of many students within the area. The course venue is a blend of natural beauty and well-maintained paths. Runners will start at Mirabeau Trailhead, running east for 1.55 miles before looping back to their starting point in the 5K race. For those taking on the longer distance, they will follow the same path but continue further until reaching a turnaround loop after 3.10 miles. The route is marked with clear signs and well-defined paths, making it accessible for all skill levels. Runners can expect to encounter gentle terrain as they navigate through Centennial Trail’s eastern section before heading back towards the trailhead. The race organizers have strategically placed aid stations along both routes to ensure that runners stay hydrated and energized during their run. Weather conditions on September 26th are expected to be mild, with an average temperature of 19.1°C. Humidity levels are moderate at 49.1%, creating comfortable racing conditions despite the possibility of some light wind gusts. Runners should prepare for a variety of temperatures throughout the day as they move from cooler morning temps around 11.8°C to warmer afternoon conditions, with highs reaching up to 26.4°C. The race offers both a 5K and a 10K option:
10K 10km • Start: 08:00:00 • Fee: $29.07
5K 5km • Start: 08:00:00 • Fee: $29.07
To register, visit https://raceroster.com/events/2026/118306/valleyfest-river-run-2026 before Wednesday, September 9th to secure your spot and receive an event t-shirt. Race numbers can be picked up at Fleet Feet, Spokane Valley (13910 E Indiana Ave) from Friday, September 25th, between 4:00 p.m. – 7:00 p.m. The start location is at Mirabeau Trailhead 1 across from CenterPlace Regional Event Center, with a minimum age requirement of 16 years old for participants. First-time runners are encouraged to arrive early and bring identification if needed. Valleyfest River Run has become an essential part of the Spokane Valley community calendar. By participating in this race, you will be contributing to local scholarships while enjoying the beauty of Centennial Trail on a pleasant fall day.
Races Offered
10K
Sep 26, 2026
straighten
Distance —
10km
terrain
Type —
Running
timer
08:00
sell
$29.07
5K
Sep 26, 2026
straighten
Distance —
5km
terrain
Type —
Running
timer
08:00
sell
$29.07
Weather History
These values represent the 3-year monthly averages for September in Spokane Valley.
thermostatTemperature
11.6° / 25.2°
wb_sunnyFeels like
9.4° / 22.3°
light_mode
Avg sunshine hours
10h 35m
water_drop
Avg rainfall
0.3 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
8.5 km/h (Light breeze)
opacity
Sweat loss rate
Moderate
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (3.5)
humidity_mid
Humidity
49.1%
wb_twilight
Sunrise
06:27
nightlight
Sunset
18:59
About Spokane Valley
Learn more about the host city, Spokane Valley.
Spokane Valley is a city in Spokane County, Washington, United States, and the largest suburb of Spokane. It is located east of Spokane, west of Coeur d'Alene, Idaho, and surrounds the city of Millwood on three sides. The city incorporated as the City of Spokane Valley on March 31, 2003. The population was 102,976 at the 2020 census, making it the ninth-most populous city in Washington State. Spokane Valley is named after the valley of the Spokane River, in which it is located. The city and the general area is colloquially referred to as "The Valley" by residents of the Spokane–Coeur d'Alene area.
