Oldham clinched their first league title in 9 years as a 20-12 victory at Keighley secured automatic promotion to the Betfred Championship.
Two early tries from former Cougars winger Mo Agoro laid the platform, with Phoenix Laulu-Togaga’e also crossing early, and George Hirst’s second-half score sealing it.
It means Sean Long’s side have an unassailable five-point lead with just two games to play, at home to Cornwall and Workington.