DateExpected
Early December 2026
Based on past editions. We'll confirm when the organiser announces.
Venue
LaSalle Springs Middle School, 3300 Highway 109, Wildwood, MO 63038
Wildwood, Saint Louis County
Countdown
December
The F.L.A.T Out Tenkay is the short one: an out-and-back of about 3 miles each way. A relaxed way to run the Wildwood trails without committing to a long day.
Key facts
01Out-and-back, roughly 3 miles each way
026-hour hard cutoff
03Return cutoff at Sherman Beach aid station before 14:00
Create a free training plan for the Wildwood Trail Marathon 10 km
7-day free trial, no card required
The course
The route
Wildwood
Distance10km
StartElevation
0 kmDrag map to rotate10.7 km
Weather
Early-December, Wildwood
8°CTypical high
-3°CTypical low
-23°CColdest in 20 years
22%Days with rain
Highs around 8°C and lows around -3°C, but it has dropped to -23°C. Rain on 22% of days. Pack for the cold end, not the average.
NASA POWER data, 2006-2025, the week either side of race day
Results
Course verified. Results not yet available.
Organiser
OrganiserTerrain Trail Runners
Websiteterraintrailrunners.com
Instagram@terraintrailrunners_stl
Running since2017
Training
Training for the Wildwood Trail Marathon 10 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 Wildwood Trail Marathon 10 km plan targets
Typical sessions
10 km
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
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 Wildwood Trail Marathon 10 km plan.
7-day free trial, no card required.
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