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Doors Open at the Diefenbunker – Full

June 4 @ 10:00 am - 3:00 pm

Diefenbunker Outside

By reservation only, the Diefenbunker: Canada’s Cold War Museum will be opening its blast doors for free for Doors Open Ottawa on Saturday, June 4, 2022.

Please be advised that if you do not have a reservation, you will not be allowed entry into the Diefenbunker.

Date: Saturday, June 4, 2022 (one day only!)
Time: 10 a.m. – 3 p.m., timed entry every 30 minutes
Price: FREE! We welcome donations to support our unique museum and national historic site.

– Tickets must be reserved in advance. Due to capacity, no walk-up visitors will be allowed entry.
– There will be no guided tours offered, only self-guided exploration of the museum.
– Our free Audio Guide and Audio Guide App can be accessed on your own device using the museum’s Wi-Fi. No Audio Guide devices will be available at the museum.


The City of Ottawa is proud to present Doors Open Ottawa — a free annual architectural event that celebrates our community’s built heritage. It is the second-largest Doors Open event in Canada, and one of the largest in the world! Learn more about 2022 Doors Open Ottawa.

Participate in the Doors Open Ottawa Scavenger Hunt! Enter for a chance to win 1 of 50 gift cards valued at $50 each. For full contest details, please visit ottawa.ca/doorsopen.