Building on his reputation as an offensive innovator, Erickson became Idaho's all-time winningest head coach in just four seasons with the Vandals (1982–85), taking them to the I-AA playoffs in his first and fourth seasons. In his first season of 1982, Erickson took an underachieving (and injured) 3–8 team in 1981 and immediately turned it into an 8–3 playoff team, led by decathlete quarterback Ken Hobart. Erickson's overall record with the Vandals was 32–15 (.680), 31–13 (.704) in the regular season and 1–2 in post season. He went 4–0 in the rivalry game with Boise State, a team which had dominated the series by winning the previous five games. (The winning streak against the Broncos reached 12 games; it was broken in 1994 when BSU advanced to the I-AA finals.)