Alice Marson, an eastern young lady, becomes engaged to Glen Arnold, a young man just out of college. Girl-like, she rushes to her friend, Lucy Starr, and tells of the engagement. Lucy, who also had designs on Glen, congratulates Alice, but determines to break up the match. While Alice, Glen and another young man are playing tennis Lucy takes Alice's photograph from Glen's pocket and substitutes one of a pretty actress. Alice finds the photograph and accuses Glen of deceiving her. Glen denies all knowledge of the photograph but Alice will not listen and breaks off the engagement. A few days later, Glen receives a letter from his old friend and college chum, Carl Graham, asking him to be his partner on a ranch in Wyoming. As he thinks there is no hope of a reconciliation with Alice, Glen gladly accepts and goes west. One day, some three years later, a cowboy rides up to Carl's ranch and hands him an invitation to a cowboy open-air dance. The invitation says, "Yourself and best girl are invited." As Carl has no "best girl" he persuades Glen to dress as a girl and accompany him to the dance. After much persuasion Glen shaves off his highly-prized mustache and dresses as a young woman. It so happens that Alice Marson is visiting at her uncle's ranch which, unknown to either Alice or Glen, is only a few miles away from Carl's ranch. Alice is also invited to the dance, but her uncle will only let her go if she agrees to dress as a cowboy, so that she will not have to dance with the rough cowboys. Alice agrees and she and her uncle go to the dance. During the dance, which is a typical cowboy open-air dance, many humorous incidents occur. Alice, dressed as a boy, flirts with the girls, and Glen, masquerading in woman's clothing, keeps all the boys dancing attendance on him. Alice pays too much attention to "Bull" Strokes' girl to suit Bull. Overcome by jealousy, Bull attempts to teach Alice, whom he thinks a man, a lesson. A quarrel ensues. Glen interferes, and during the scuffle loses his wig. Alice's hat is knocked off by Bull, letting her hair fall about her shoulders, thereby disclosing her identity. Alice and Glen recognize each other. Explanations follow and the lovers are reunited.