At age two, Mioland was regularly ridden by Earl Dew, who won several races aboard the colt at California racetracks.
Triple Crown series, under jockey Lester Balaski, Mioland ran fourth to winner Gallahadion in the Kentucky Derby, then second to Bimelech in the Preakness Stakes.
Mioland remained on the West Coast of the United States where he won three important races in 1941, including his second consecutive San Juan Capistrano Handicap.
Mioland's 1941 performances earned him American Champion Older Male Horse honors from Daily Racing Form.
Retired to stud duty, Mioland had limited success as a sire but did get several winners of minor races before dying in 1951 at the relatively early age of fourteen.