DateExpected
Late May 2027
Based on past editions. We'll confirm when the organiser announces.
Venue
Lake Youngs Watershed, Renton, Washington
Renton, King County
Countdown
May
100k that starts with an out-and-back, then settles into six laps of the 9.4-mile loop. Under 1,650 m of climbing keeps it fast and runnable.
Key facts
01Out-and-back first, then 6 full 9.4-mile loops
02Course closes Sunday at 16:00
Create a free training plan for the Pigtails Challenge 100 km
7-day free trial, no card required
The course
One lap, on repeat
Renton · one lap
Distance100km
Total climb1,645m
Start · finishOne lap · elevation
0 kmDrag map to rotate14.6 km
Weather
Late-May, Renton
17°CTypical high
9°CTypical low
4°CColdest in 20 years
43%Days with rain
Highs around 17°C and lows around 9°C, but it has dropped to 4°C. Rain on 43% of days.
NASA POWER data, 2006-2025, the week either side of race day
Results
Course verified. Results not yet available.
Organiser
OrganiserNorthwest Endurance Events LLC
Running since2012
Training
Training for the Pigtails Challenge 100 km
We don't do generic plans. We combine deep knowledge of this race's demands with your recent training, then build a plan with you that progresses as you do.
Beina integrates directly with your existing tools to understand your current fitness, and synchronise your planned sessions.
Intervals.icuWhat a Pigtails Challenge 100 km plan targets
Typical sessions
100 km with 1,645 m of climbing
Time on feet and fatigue resistance
Fuelling and pacing for the whole event
What your weeks look like
Typical sessions
Long runs that build time on your feet
Tempo and threshold sessions to hold race pace
Hill reps and vert to prepare the climbs and descents
Back-to-back weekend runs for fatigue resistance
Not a generic schedule
Typical sessions
Built from your current fitness and the time you actually have
Adapts every week as Beina learns how you respond
Syncs your sessions straight to Garmin and Wahoo
One clear next session, never a wall of spreadsheet
Entries open now
Get your Pigtails Challenge 100 km plan.
7-day free trial, no card required.
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