Alberta's Rilen Donaldson lost 10-3 to Alberta's Abby Desormeau in the Final of the Cochrane U15 Junior Spiel, held November 5 - 7, 2021 at the Airdrie Curling Club in Airdrie, Canada. To advance to the championship game, Alberta's Rilen Donaldson won 10-5 over Alberta's Nolan Duncan in the semifinals of the 2021 Cochrane U15 Junior Spiel in Airdrie, Alberta, Canada;
 
Alberta's Rilen Donaldson finished 3-0 in the 0-team qualifying round. . In their opening game, Alberta's Rilen Donaldson defeated Gemma Nickerson (Okotoks, AB) 6-5, then won 11-6 against Rachel Sipka (Calgary, AB) and 15-5 against Alberta's Reese Morison in their final qualifying round match.
 
Alberta's Rilen Donaldson ranks th overall on the Year-to-Date rankings with points earned so far this season.