in february 2013, mahon joined fellow league one club stevenage on a loan deal for the remainder of the 2012–13 season. he made his stevenage debut in the club's 2–1 away defeat to shrewsbury town on 23 february, playing the whole match. mahon went on to make nine appearances for the club during the two-month loan spell.<ref name="games played by gavin mahon in 2012/2013"></ref> mahon was released by notts county at the end of the 2012–13 campaign.