 Coulson made a goalscoring second comeback from his ankle injury in Grimsby's 2–2 home draw with Eastbourne Borough on 30 October 2010.For the first time as a Grimsby player he scored twice in one match in a 2–1 victory at home to AFC Wimbledon on 5 March 2011, with a first-half shot into the bottom left of the goal and a second-half shot into the top-left corner from inside the penalty area.Coulson's first season as a permanent Grimsby player concluded having scored nine goals in 33 appearances.