He made his debut for the Tangerines on 29 August 1967 in a 1–1 draw at Ipswich Town in the league, replacing the injured Bill Bentley.
After sitting out the majority of the 1968–69 season (with Bill Bentley taking over his left-back role), he made only twelve league starts.
He scored his first goal for the club in their FA Cup third-round win against West Ham at Bloomfield Road on 2 January 1971.
At the end of the season, after Blackpool had been relegated to Division Two, new manager Bob Stokoe made it clear that he was going to favour Bentley at left-back, and so Mowbray departed the seaside.
Jimmy Armfield, now manager at Bolton Wanderers, re-signed the Scot, and he made 31 league appearances for the Trotters in two years.