Monster of Mazinaw Trail Race 2025

The Monster of Mazinaw Trail Race is an annual trail running event held at Bon Echo Provincial Park near Cloyne, Ontario. It features a variety of terrains including groomed trails and technical rocky single tracks, with challenging back-country sections especially on the 30k and 43k courses, ideal for experienced trail runners.

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The event is Athletics Ontario sanctioned and partners with La Sportiva for demo shoes and giveaways. It offers a memorable trail running experience capped at 275 participants to preserve the quality of the race.

• Trail surface featuring groomed trails and rocky single track
• 30k and 43k courses have up to 10-12 km of self-supported back-country sections
• Rocky paths, numerous roots, steep ascents and descents
• Well-marked course with a full participant guide provided in advance

• Sanctioned by Athletics Ontario
• Partnered with La Sportiva offering demo shoes and giveaways
• Challenging technical trail terrain with back-country sections
• Limited registration capped at 275 participants