Demi-Marathon de Lachine
The Lowdown
The Demi-Marathon de Lachine is an annual half marathon and multi-distance race day held along the Lachine Canal National Historic Site in the Lachine borough of Montréal, Québec. Organized by the Lachine-Dorval Running Club since 2012, the event offers a certified 21.1 km half marathon alongside 10 km (with a Nordic walking option), 5 km, 2 km, and 1 km races on a flat loop course through Noël-Spinelli, Saint-Louis, Fort-Rolland, Stoney Point, and Summerlea parks, with adjoining start and finish lines near Parc René-Lévesque. The 5 km, 10 km, and half marathon distances carry Athletics Canada course certification. Some directories and partner listings identify the event as the Demi-Marathon Bonneville de Lachine after a title sponsor, though the official race branding remains sponsor-neutral. Proceeds support the Société Alzheimer de Montréal. The 2026 edition takes place Sunday, October 18, with a T-shirt and finisher medal included for all distances.
Race Day
Weather Forecast
Elevation
Terrain Profile
Relatively flat course
Participants
Field Size
Medium-sized race
Crowd Rating
Spectator Support
Good crowd energy
Lachine Canal National Historic Site
Parc René-Lévesque (start/finish)
Summerlea Park
Stoney Point Park
Fort-Rolland Park
Saint-Louis Park
Noël-Spinelli Park
Other distances available during the event weekend:
Montréal, Québec, Canada
CA
Average rate for 3-star accommodations near the start line
Eligibility
- Minimum age 18 on race day for the 21.1 km half marathon
Required Documents
- Photo ID for in-person bib pickup
Entry Methods
- Online registration via MS-1 Inscription (ms1inscription.com)
Cancellation & Refund Policy
Review the official transfer/deferral policy on demimarathonlachine.com before registering; distance changes and bib transfers allowed until October 15, 2026 for a fee
Organized by the Lachine-Dorval Running Club, running since 2012
Course is a flat loop along the Lachine Canal; 5K, 10K, and half marathon distances are Athletics Canada certified
Pace bunnies offered for the half marathon at 1:45, 2:00, and 2:15 finish targets
Proceeds benefit the Société Alzheimer de Montréal
Some third-party listings (Tourisme Montréal, Athlétisme Québec, Ahotu, SportStats) title the event 'Demi-Marathon Bonneville de Lachine' after a sponsor; the official site currently brands it sponsor-neutral as 'Demi-Marathon Lachine'
250 parking spaces available at Parc René-Lévesque before 7:00 AM race morning; additional parking at LaSalle City Hall and near Collège Sainte-Anne
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