 On 14 May 2015 Jarman, alongside North Ferriby teammate Matt Wilson, signed a 2-year contract with Gainsborough Trinity.Jarman will be remembered by the Trinity fans for scoring the only goal of the game in a 1-0 victory away at Wrexham in the 4th Qualifying round of the FA Cup.Following the managerial appointment of Dominic Roma, Jarman was made first team captain.