The cup-shaped nest is built under a rock ledge or in the rafters or eaves of buildings. The female lays four to six eggs. Both parents help incubate the eggs and care for the young. The eggs take around two weeks to hatch and the chicks will fledge when they are about three weeks old. The female may have two broods a year.
Barn swallows are Neotropical migrants.
They travel by day, eating as they fly. They can travel as many as 600 miles a day. Barn swallows migrate in large groups.