Welcome to the home of the WTF 50 & 100 Miler, the first & original 100 mile trail race in Western Australia.
Held annually on the long weekend in September (WA’s King’s Birthday Public Holiday weekend), the 100mi, 50mi & 50km events 6am on Saturday.
All events (solo and relay distances) will depart together at 6am, sharing the trail for the first leg.
WTF Ultra will not be running in 2025, but will return in 2026.
History
Why WTF? Other than being an attention-grabbing name, WTF is an acronym for “Waterous Trail on Foot”. The Waterous Trail, located south of Dwellingup, was to host the course for the inaugural event in 2013. Unfortunately, as the race-date neared, authorities advised of a prescribed burn in the area planned around the time of the event. This resulted in a switch to a course run predominantly on the Munda Biddi trail between Jarrahdale and Dwellingup.
In 2019, the race HQ moved from Dwellingup to Nanga Bush Camp (around 10 minutes south of Dwellingup), with two out-and-back legs. In 2021, this changed to three out-and-back legs. And in 2022, a new race distance of 50km was added.
Summary Details
When: Saturday 26th September 2026 (King’s Birthday Long Weekend).
How long in existence: Inaugural race was 28 September 2013
Races Offered
100mi
Sep 26, 2026
straighten
Distance —
160.9K
terrain
Type ——
timer
64 days remaining
50km
Sep 26, 2026
straighten
Distance —
50K
terrain
Type ——
timer
64 days remaining
50mi
Sep 26, 2026
straighten
Distance —
80.5K
terrain
Type ——
timer
64 days remaining
Relay - 100mi
Sep 26, 2026
straighten
Distance —
160.9K
terrain
Type ——
timer
64 days remaining
Relay - 50mi
Sep 26, 2026
straighten
Distance —
80.5K
terrain
Type ——
timer
64 days remaining
Weather History
These values represent the 3-year monthly averages for September in Nanga Brook.
thermostatTemperature
9.5° / 19.0°
wb_sunnyFeels like
6.7° / 16.2°
light_mode
Avg sunshine hours
10h 7m
water_drop
Avg rainfall
2.7 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
12.9 km/h (Gentle breeze)
opacity
Sweat loss rate
Low
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (5.0)
humidity_mid
Humidity
76.3%
wb_twilight
Sunrise
06:13
nightlight
Sunset
18:07
About Nanga Brook
Learn more about the host city, Nanga Brook.
Nanga Brook is a former town located in the Peel region of Western Australia in the Lane Poole Reserve between Dwellingup and Waroona.
