The Plain races, set against the dramatic backdrop of Washington's Cascade Mountains, offer an unparalleled challenge for endurance runners seeking remote and rugged terrain. Nestled within the Lake Wenatchee, Entiat, and Chelan ranger districts, this self-supported adventure spans approximately 85 miles of USFS trails and 20 miles of forest service roads, weaving through some of the most secluded landscapes in North America. Elevation changes are a defining feature of The Plain races, with runners tackling around 21,000 feet of cumulative ascent and descent. This course is not for the faint-hearted; it demands rigorous training focused on long stretches of self-sufficiency across challenging terrain. Participants must carry all their food, water (supplemented by natural sources like creeks and rivers along the route), and necessary gear from start to finish or after a single resupply point located around 100 kilometers into the journey. The Plain races are more than just an athletic challenge; they also serve as a vital fundraiser for local Search and Rescue teams and military veteran support groups. By participating, runners contribute directly to these essential community services while immersing themselves in breathtaking mountain scenery that includes dense forests, alpine meadows, and stunning vistas of crystal-clear lakes. Qualification standards are stringent, requiring entrants into the 100-mile event to have completed a similarly demanding trail race or The Plain's own 100K. For those aiming for the shorter but equally formidable 100K distance, while no formal qualification is required, it’s advised that runners possess experience in challenging races of at least 50 miles and demonstrate significant levels of self-reliance. In adherence to safety protocols, should circumstances such as wildfire closures prevent the event from taking place, refunds will be issued minus a portion reserved for covering direct expenses. For detailed information about training tips, race logistics, and how your participation supports local causes, visit www.plain100.com.
Races Offered
100 Miler
Sep 19, 2026
straighten
Distance —
160.9K
terrain
Type —
Running
timer
05:00
sell
$135.00
Plain 100K
Sep 19, 2026
straighten
Distance —
100K
terrain
Type —
Running
timer
05:00
sell
$100.00
Weather History
These values represent the 3-year monthly averages for September in Leavenworth.
thermostatTemperature
12.7° / 26.1°
wb_sunnyFeels like
11.1° / 24.2°
light_mode
Avg sunshine hours
10h 49m
water_drop
Avg rainfall
0.7 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
6.0 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
56.2%
wb_twilight
Sunrise
06:40
nightlight
Sunset
19:12
About Leavenworth
Learn more about the host city, Leavenworth.
Leavenworth is a resort city of about 2000 people in the North Central Cascades of the State of Washington. The Bavarian-themed architecture and dining options entice visitors year-round, as a base for roaming the surrounding mountains and the Wenatchee River, and for winter festivals of dazzling lights and snow.