Spring ultramarathons in Ontario, Canada

Timed 6-hour event on a 2.5km loop at Willow Tree Golf Course, featuring scenic views, clubhouse amenities, and options for solo or relay teams.

Flat, fast 50k course on wide groomed trails with out-and-back route, scenic conservation lands, creeks, and frequent aid stations

Mixed single track and ski trails through Horseshoe Valley hills, multiple distances with a challenging 50K, off-road terrain and scenic views

Woodland trails with winding flats, rocky and root-strewn stretches, lake views, double loop format, and day or night running options in Wildwood Conservation.

Multi-lap forest trail course featuring varied terrain, scenic woodland views, and endurance-focused 30km or 6-hour ultrarunning formats

Scenic 6.25 km loop through forest trails and gravel paths with hills at Shade’s Mills Conservation Area, offering distances up to 50 km plus 12-hour options.

20K loop over groomed trails and technical single track, featuring rolling hills and steep climbs amid Niagara Escarpment scenery and natural springs

Single-track trails through Mansfield Outdoor Centre and Dufferin County Forest, featuring pristine natural landscapes