Gulls build basic nests on the ground in safe open areas. The nest often consists of grass, seaweed and some sticks. They nest in colonies on sandy or gravely areas near the shore. These birds have one brood a year with an average of three eggs. Incubation takes 20 to 24 days with a six week fledgling period before the young leave the nest. The eggs are brown, green or blue with blotches of black, brown or gray.

Some species are migratory. Gulls need open water and secluded breeding areas. Because of this, Northern Gulls will fly south away from frozen lakes and rivers in the winter, while southern gulls stay put year round. They have a distinct springtime breeding season. The young take two years to mature and display adult plumage.