Severe storms on March 17–18, 2026, caused over 310,000 power outages in Quebec and eastern Canada, with strong winds and downed trees disrupting travel and infrastructure.

Severe winds and winter storms on March 17–18, 2026, caused widespread power outages across Central Canada and the Maritimes, affecting more than 310,000 customers in Quebec, primarily in the Laurentians, Lanaudière, and Montérégie regions, with gusts up to 110 km/h. Thousands more lost power in eastern Ontario and the Maritimes due to downed trees and damaged lines, prompting emergency crews to work on repairs. Highway closures and hazardous travel conditions were reported, especially on Highway 401 and other major routes. No fatalities or serious injuries were reported, but infrastructure strain highlighted grid vulnerabilities during extreme weather. Restoration efforts continued, with full recovery expected to take time.