AAC Kolosse is a yellow-hulled, spring oat (Avena sativa L.) cultivar bred by the Ottawa Research and Development Center (ORDC), Agriculture and Agri-Food (AAFC). It was supported for registration by the Ontario Cereal Crops Committee (OCCC) in January 2015 and registered in Canada on 8 Apr. 2016 (CFIA variety registration number 7981). AAC Kolosse is adapted widely to Canada but more so to Ontario and Zone 1 of Quebec. The strengths of AAC Kolosse include high groat content, superior resistance to crown rust, and superior resistance to lodging. AAC Kolosse is later to heading than the control cultivars.