The setting is the 1930s in the midwestern United States, at the time of the spring harvest and also of high school graduation.
Laurie, the high-school senior daughter of the Moss family, is on the brink of graduating high school. At the start of the opera, Beth, Laurie's sister, is dancing by herself, and Ma Moss, Laurie and Beth's mother, is sewing. The postman, Mr. Splinters, delivers a package with Laurie's graduation dress. He also brings gossip about a neighbour's daughter being frightened by two strangers to the area. Ma Moss and Grandpa Moss are worried about this. Two itinerant workers, Top and Martin, arrive on the scene. After initial suspicion, Grandpa Moss agrees to hire Top and Martin to help out with the harvest. Laurie and Martin meet, and feel sympathy for each other. Top asks for Martin's help later in getting Grandpa Moss drunk at the party that night.
The party to celebrate Laurie's graduation is going on. Everyone has eaten well, and Laurie acknowledges the guests' well wishes to her. The dance begins. Ma Moss thinks that Top and Martin are the two strangers reported to be causing trouble in the area, and tells Mr. Splinters, who goes to tell the local sheriff. As the dance proceeds, Grandpa Moss becomes more drunk. Laurie and Martin are now in love, and they kiss at one moment. Grandpa Moss sees this and becomes angry. Top tells Martin that they should leave, but the sheriff arrives with the news that the two strangers causing the local disturbances have been caught. Even though Top and Martin have been proven innocent, Grandpa Moss says that they have to leave in the morning.
Later that night, Laurie and Martin dream of eloping. However, Martin changes his mind, with the counsel of Top in the background advising that such a situation would cause great trouble for them all. During the night, while Laurie is packing, Top and Martin secretly leave. Laurie is left alone, but then suddenly resolves to leave home and make her own way in the world. Ma Moss and Beth try to change Laurie's mind, but she is determined to move on. Ma Moss accepts this eventually. The opera ends as Laurie leaves, with Beth dancing by herself as she did at the beginning.