Despite a difficult 2012 season, Jennings once again qualified for the BDO World Championship in 2013. His first round opponent was sixth seed Ross Montgomery. Montgomery was in control of the match when Jennings hit a 144 checkout to save the third set, followed by a 102 checkout to win it. Jennings proceeded to win the match 3-1. In the second round, Jennings continued his fine finishing with a comprehensive 4-0 victory over Jason Cullen. Jennings then played eventual champion Scott Waites in the quarter-finals, where he trailed 4-0 but won back two sets before eventually being defeated 5-2.