Listings >> Historic Sites >>Parks Carhagouha – 1615 site of first Mass in Ontario Website Add to favorites Favorite Share Share Carhagouha is the site of the first mass in Upper Canada, celebrated in Ontario by Father Joseph LeCaron in the presence of Samuel Champlain, which took place on August 12, 1615. The site is … Continue reading Carhagouha – 1615 site of first Mass in Ontario