While pursuing his baseball career, Howell coached football in his autumn off-seasons; leading the
National Autonomous University of Mexico to a
Liga Mayor national championship in 1935 and serving as an assistant at
Loyola University New Orleans in 1936.--> Following a season in the NFL in
1937, he was hired as head coach at the
Arizona State Teachers College in
Tempe, and stayed for four seasons (1938–1941) with the
Bulldogs, with two conference titles and two appearances in the
Sun Bowl. He was a finalist for the open job at Idaho in
1941 to succeed
Ted Bank, which went to
Francis Schmidt, then resigned his position at Tempe in the spring of 1942 and joined the
U.S. Navy as a physical training instructor for naval aviators. He served until his discharge as a
lieutenant commander in November 1945, then returned to
Tuscaloosa in January 1946 as an assistant football coach (backs) and head baseball coach for the Crimson Tide. and guided the usually-struggling Vandals to a promising 4–4 record in his first season in
Moscow, Idaho's best since
1938. The Vandals beat
Stanford on the road, a team that had defeated them 45–0 the previous year (but went winless in
1947). It was Idaho's second-ever football victory over a PCC team from California, following a victory over first-year
UCLA in 1928. The Vandals also knocked off an undefeated
Utah in the season finale in
Boise. The Vandals drew a
Palouse and
state record crowd to
Neale Stadium for their
annual rivalry game with Washington State in October, albeit a close 7–0 loss to the Cougars. These promising factors earned Howell a two-year contract extension through 1950. The progress did not continue, as the Vandals opened the
1948 season with four losses and went overall and in conference, defeating only
Montana for the
Little Brown Stein. Idaho played Washington State close at
Rogers Field in
Pullman and gave
Oregon a scare in Moscow. The Ducks, with
Norm Van Brocklin and
John McKay, went 7–0 in conference and were co-champions with
California. Howell's relationship with Idaho fans and the administration was strained following the
1949 season. The Vandals went and in conference that season, defeating only departing Montana again. Their two non-conference wins were against overmatched opponents
Willamette and
Portland, and the Vandals were severely outscored in their five losses, capped by a loss at
Stanford to end the season. Howell felt compelled to publicly deny rumors in April that he would leave before the 1950 season. The Vandals posted a 3–5–1 record in 1950 and 1–1–1 in conference, and Howell's contract was not renewed in March 1951. Assistant coach
Babe Curfman succeeded him, after leading the team through its spring drills on an interim basis. While Howell was the head coach, the Idaho Vandals wore red jerseys.{{cite news |url=https://news.google.com/newspapers?id=ki1WAAAAIBAJ&sjid=Z-UDAAAAIBAJ&pg=6556%2C4906800 ==In media==