Officials with The Canadian Museum For Human Rights announced the Sept. 20 date on Monday.
The museum has been in the works since 2003 and has been the subject of controversy over its content and its cost.
The Ukrainian Canadian Congress has complained the museum is giving a full gallery to the Nazi Holocaust, but not to the suffering of Ukrainians under the Soviet regime of Joseph Stalin.
The museum's price tag has also gone up almost $100 million to $351 million.
The federal government essentially took over the project in 2007 and has committed to cover $21.7 million in annual operating costs.
The federal and Manitoba governments also put up money for construction, and last year stepped in with a loan and loan guarantee to cover a $70-million funding gap.