Collie River Ultra Marathon

Collie, Australia • 13 Sep 2025

The Collie River Ultra Marathon (CRU100) is a premier trail running event held in the scenic town of Collie, Western Australia. Featuring 100km, 50km, and relay race options, the course showcases the newly developed Wiilman Bilya Trail, winding through lush jarrah, marri, and yarri forests, granite outcrops, and along the Collie River Valley and Wellington Dam. The terrain varies from flat, fast sections to runnable single tracks with some technical climbs, offering a challenging yet accessible experience for all levels. Fully supported with aid stations, medical support, and expert course marking, the event emphasizes safety and community spirit, making it a standout adventure in Australia’s trail running calendar. Visit the organization's website for the most recent information.

Race information

101 km
2000 m+
100km Solo
76 km
1600 m+
Relay Marathon
50 km
1051 m+
50km Solo
Visit the organization's website for the most recent information.
Trail runs nearby

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