The team hosted the first ever playoff game at the new Mosaic Stadium, but lost to the Winnipeg Blue Bombers in the West Semi-Final.

On December 8, 2017, the Roughriders released Beau Landry, Zach Minter, Ivan Brown and Cameron Ontko.

On December 20, 2017, it was announced the Roughriders re-signed Canadian quarterback Brandon Bridge, who split starting duties with Kevin Glenn during the 2017 season.

The next day, the Roughriders would re-sign veteran defensive back Jovon Johnson and offensive lineman Thaddeus Coleman.

The next day, the Roughriders acquired defensive lineman Charleston Hughes from the Hamilton Tiger Cats in exchange for quarterback Vernon Adams.

On February 13, 2018, the first day of CFL free agency, the Roughriders re-signed national offensive lineman Dan Clark and fullback Spencer Moore.

They also released international linebacker Glenn Love and offensive lineman Derek Dennis, who was their top free agent signing from 2017.