Has a CFL game ever ended 20-5?

Exactly once. On August 27, 1999, Montreal Alouettes beat Toronto Argonauts 20-5, and no CFL game before or since has ended that way. When it happened it was a scorigami, the first 20-5 in league history.

Where 20-5 sits among nearby CFL scores. Deeper blue means a score has happened more often; the outlined cell is the new one.

That makes 20-5 the 850th most common final score out of 1,183 that have ever occurred in CFL. One point away, 21-5 has happened 1 times and 20-6 has happened 2 times.

Every 20-5 in CFL history

Date	Result	Season
1999-08-27	Montreal Alouettes over Toronto Argonauts	1999

Open the CFL grid at 20-5