The Dukes were preceded in Kansas State play by the 1887 Wellington "Browns," who won the league championship.
Wellington compiled a 20–15 record playing under manager Jack Pettiford to finish 3.0 games ahead of the second place Arkansas City team in the final standings.
The Arkansas City-Winfield Twins, Great Bend Millers, Hutchinson Salt Packers, Larned Cowboys, Lyons Lions, McPherson Merry Macks and Newton Railroaders teams joined Wellington as 1909 league members.
Playing under managers Cy Mason and John Meade, the Dukes finished 17.0 games behind the first place Lyons Lions in the final Kansas State League standings, as no playoffs were held.
The Dukes finished 19.5 games behind the first place Hutchinson Salt Packers in the final standings of the eight–team league.
[11][12][9] On August 12, 1910, Wellington pitcher Henry Grohs threw a no-hitter in a 1–0 Dukes victory over the Larned Wheat Kings.