Mantario Marathon

Mantario Marathon

Date: September 27 - 28, 2025

Location: Off highway 312, Whiteshell, MB

Course Details: It’s not a Marathon; it’s a Fat Ass event—no fees, no aid, no swag, no whining. Participants must be self-reliant and carry everything they need for the event. The course includes a mass start, traverses a black diamond trail with ups and downs totaling over 1500 meters of elevation change, and includes numerous water crossings.

Event Overview:

• Date: Last full weekend of September, annually since 1980
• Format: Self-supported 2-day event
• Day 1: 32 km from Caddy Lake South Mantario Trailhead to Moosehead Lake
• Day 2: 32 km back to Big Whiteshell North Mantario Trailhead

Participant Requirements:

• All competitors must be self-sufficient.
• Carry your food, water, first aid, and camping gear.
• Assist others when necessary, pack out what you pack in.

Please ensure to do training for carrying your overnight gear while running the distance.

Registration: Free, as it is a Fat Ass event.

For more information, visit the event's website: Mantario Marathon Website