The St. Lawrence Marathon, formerly known as the "Cornwall Run to End MS," is a scenic and community-focused race series along the shores of the St. Lawrence River in Cornwall, Ontario. This sold-out springtime tradition attracts runners of all levels, offering flat, fast courses through tranquil waterfront pathways and historical settings.

​

Participants can choose from distances including Marathon, Half Marathon, 10K, and 5K, each providing a chance to experience local camaraderie, Boston Marathon qualifying standards for the full marathon, and a friendly, welcoming atmosphere.

* Point-to-point marathon from Crysler Park Marina near Morrisburg to St. Lawrence College in Cornwall * Course follows bike path and paved pathways * First 2 km on dirt road, remainder mostly asphalt * Net downhill elevation profile, fast and flat * Certified by Athletics Canada * Multiple age group discounts * Stroller not allowed on all race distances

• Scenic waterfront courses along the St. Lawrence River
• Boston Marathon qualifier for the full marathon
• Certified course by Athletics Canada
• Flat, mostly asphalt paths with slight net downhill
• Community event with friendly atmosphere and local pride
• Age-based discounts and free entry for seniors 80+
• Sold-out, well-organized spring racing tradition