Ben and Jim-Bob get on each other's nerves. They end up dating each other's girlfriends. Meanwhile, Mamie Baldwin sees a rose bush dying and thinks it means she will die. Grandpa finds a way to help her feel young again.
Jason practices his music for a town festival. He finds Josh, Verdie's son, plays the horn. They practice together. The festival organizers do not want Josh. Elizabeth and Aimee Godsey compete for the same boy. (Spring 1940)
Jason helps Verdie research her family tree. They find people who knew her family. Elizabeth starts writing to a soldier at Camp Lee, pretending she is 18 years old by sending Erin's picture as her own.
John-Boy returns to Walton's Mountain to write about the failing economy and lack of jobs. He talks Mr Guthrie into opening the old mine. As the menfolk are in the mine, it collapses. John makes a decision about working at a defense plant.
John-Boy proposes to Daisy and she says yes. Daisy reconnects with her mother and learns some surprising news. Elizabeth and her friend George open a lemonade stand. Grandpa finds a way to increase sales.
Grandma returns from the hospital but the family does not let her do anything. (Ellen Corby recovered enough from her stoke to return to the series.) An overweight boy is interested in Elizabeth. (This is Will Geer's last episode.)
Grandpa Zeb (Will Greer) has died and everyone is mourning. Neighbor Flossie Brimmer has also died. Mary Ellen and Erin move to Charlottesville into an apartment to be on their own. John tries to get a large lumber contract.
Verdie Foster's daughter Esther returns to the mountain. Graduated with honors from college, she cannot find a job. Erin helps her get a job at Pickets Plant. Ike Godsey puts up a board of the local boys in the war.
Ben starts an autocourt venture with Corabeth. Then they find out the government stops all new constructions. Ben comes up with a clever plan to use old cabins. Meanwhile, Yancy takes a mail course to become a barber.