Montgomery was defeated in the first round of the 2013 BDO World Darts Championship 3–1 by Paul Jennings, having had four darts to lead 2–1. Montgomery captained Scotland to silver behind England in the overall team competition at the 2013 WDF World Cup, while alongside team-mates Gary Stone, Craig Baxter and Alan Soutar, Scotland defeated America 9–7 in the men's team final. Montgomery again reached the semi-finals of the Zuiderduin Masters, losing to eventual champion James Wilson.