Half marathonRegistration Open

Demi-Marathon de Lachine

October 18, 2026 · 8:45 AMMontréal, Québec, Canada

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Race snapshot

Race Day

48°F

43–61°F · Feels cool

Total elevation gain

98ft

Relatively flat course · Net elevation change +16 ft

Participants

2,500

Medium-sized race

Crowd Rating

5/ 10

Good crowd energy

Entry

Registration Open

21.1 km (Half Marathon)

CA$139

Half marathon entry, current summer-sale rate valid until August 30, 2026 (base fee, excludes taxes and platform transaction fees). Participants must be 18 or older on race day.

Official Website

Key Dates

1. Summer Sale Rate Deadline
  Aug 30, 2026
  Last day for the current discounted entry pricing before rates increase through the fall.
2. Distance Change / Transfer Deadline
  Oct 15, 2026
  Last day to transfer a bib to another person or change distance, for an added fee.
3. Race Day
  Oct 18, 2026
  10K starts 8:00 AM, 21.1K starts 8:45 AM, 5K starts 11:30 AM, 1K starts 12:15 PM, 2K starts 12:30 PM; event closes 2:00 PM.

Found in

Half Marathons in Canada Half Marathons in North America Flat Half Marathons in North America Flat Half Marathons

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.

Minimum Age: 18 years
Entry Methods: Online registration via MS-1 Inscription (ms1inscription.com)
Eligibility: Minimum age 18 on race day for the 21.1 km half marathon
Required Documents: Photo ID for in-person bib pickup
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

01: Organized by the Lachine-Dorval Running Club, running since 2012
02: Course is a flat loop along the Lachine Canal; 5K, 10K, and half marathon distances are Athletics Canada certified
03: Pace bunnies offered for the half marathon at 1:45, 2:00, and 2:15 finish targets
04: Proceeds benefit the Société Alzheimer de Montréal
05: 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'
06: 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

Prepare for This Race

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