Has a CFL game ever ended 20-0?

Exactly once. On August 18, 1965, Montreal Alouettes beat Toronto Argonauts 20-0, and no CFL game before or since has ended that way. When it happened it was a scorigami, the first 20-0 in league history.

Where 20-0 sits among nearby CFL scores. Deeper blue means a score has happened more often; the outlined cell is the new one.

That makes 20-0 the 850th most common final score out of 1,183 that have ever occurred in CFL. One point away, 21-0 has happened 1 times and 20-1 has happened never.

Every 20-0 in CFL history

Date	Result	Season
1965-08-18	Montreal Alouettes over Toronto Argonauts	1965

Open the CFL grid at 20-0