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Every year, Doors Open Ontario attracts large crowds across Ontario. From April to October, residents and visitors are invited to discover first-hand Ontario’s hidden heritage treasures, some of which have never been open to the public.

Events by Date – 2011

City	Date
Amherstburg Haldimand County Newmarket Rideau Lakes-Westport St. Marys Waterloo Region	Saturday, September 17, 2011
London Middlesex South Bruce Peninsula	Sat-Sun, September 17-18, 2011
Merrickville	Sunday, September 18, 2011
Brant East Elgin Oxford County Pembroke	Saturday, September 24, 2011
Grimsby Oakville Oshawa Peterborough	Sat-Sun, September 24-25, 2011
Barrie Mississauga Pickering Port Stanley-Sparta	Saturday, October 1, 2011
Gananoque St. Thomas Vaughan	Sat-Sun, October 1-2, 2011
Kincardine	Sat-Sun, October 15-16, 2011

Events by City – 2011

City	Date
Amherstburg	Saturday, September 17, 2011
Barrie	Saturday, October 1, 2011
Brant	Saturday, September 24, 2011
East Elgin	Saturday, September 24, 2011
Gananoque	Sat-Sun, October 1-2, 2011
Grimsby	Sat-Sun, September 24-25, 2011
Haldimand County	Saturday, September 17, 2011
Kincardine	Sat-Sun, October 15-16, 2011
London	Sat-Sun, September 17-18, 2011
Merrickville	Sunday, September 18, 2011
Middlesex	Sat-Sun, September 17-18, 2011
Mississauga	Saturday, October 1, 2011
Newmarket	Saturday, September 17, 2011
Oakville	Sat-Sun, September 24-25, 2011
Oshawa	Sat-Sun, September 24-25, 2011
Oxford County	Saturday, September 24, 2011
Pembroke	Saturday, September 24, 2011
Peterborough	Sat-Sun, September 24-25, 2011
Pickering	Saturday, October 1, 2011
Port Stanley-Sparta	Saturday, October 1, 2011
Rideau Lakes-Westport	Saturday, September 17, 2011
South Bruce Peninsula	Sat-Sun, September 17-18, 2011
St. Marys	Saturday, September 17, 2011
St. Thomas	Sat-Sun, October 1-2, 2011
Vaughan	Sat-Sun, October 1-2, 2011
Waterloo Region	Saturday, September 17, 2011