From April to October, Ontario opens its heritage sites to the public with free events all over the province. Whether you’re checking things out on your own, planning a fun day with family and friends, or setting up a first date, Doors Open Ontario has something for everyone.
Thomas Fisher Rare Book Library – Photo Credit: City of Toronto
You can explore everything from historic homes to modern architectural wonders. Doors Open Ontario highlights the buildings, natural areas, infrastructure, and cultural landscapes that shape our communities.
Since its start in 2002, more than 7.3 million visits have been made to thousands of unique places. The Doors Open Ontario program also positively affects local communities; participants spent over $13.1 million during their travels in 2017 while discovering heritage conservation and local history-all while having fun.
The 2026 Doors Open Ontario features numerous events showcasing special buildings and natural heritage spots throughout the province. Each event will include local programmers sharing fascinating stories about Ontario and giving residents exclusive access behind-the-scenes at stunning heritage locations-offering endless adventures for everyone.
2026 Doors Open Ontario Dates
April
May
June
July
August
Haldimand – August 1 Burlington – August 8 Cornwall and SDG Counties – August 15-16
September
Belleville – September 12 Peterborough -September 12 Kawartha Lakes – September 13 Thousand Islands – September 18-19 Simcoe County – September 19 Waterloo Region – September 19 London – September 19-20 Aurora – September 20 Barrie – September 26 Markham – September 26 Sault Ste. Marie – September 26
