In the summer when Kiley Swanson gets off work from his full-time job at a local farm, his day is just beginning.

Swanson, 25, drives down the road to his parent’s farm near Dayton, where he and his dad, Charlie, and mom, Judy, grow a one-acre vegetable plot.

The Swansons spend their aftern­­oons picking tomatoes, cuc­umbers and sweet corn; digging up onions; and planting a fall crop of lettuce.

If they need to work past...