Yellow Jacket

Yellow jackets are wasps in the genus Vespula (and the closely related genus Dolichovespula) within the family Vespidae, order Hymenoptera. Numerous species occur across North America, Europe, and Asia, with the eastern yellowjacket, Vespula maculifrons, being one of the most common in eastern North America.

These wasps are notable for their smooth, brightly banded exoskeleton and their tendency to build large paper nests in concealed locations, often underground or within building cavities, distinguishing them from the open, umbrella-shaped nests of paper wasps. Colonies can grow to several thousand individuals by late summer.

Ecologically, yellow jackets are effective predators of many pest insects during the spring and summer months, though their attraction to sugary foods and protein scraps in late summer often brings them into close contact with human outdoor activities.

• Smooth, shiny black body with bold, well-defined yellow bands and markings.
• Narrow, distinctly pinched waist connecting the thorax and abdomen.
• Two pairs of clear wings folded lengthwise along the body at rest.
• Legs and antennae mostly dark, without the dense hair seen on bees.
• Lookalikes: honey bees are fuzzier and more amber-toned, while paper wasps are more slender with longer legs that dangle noticeably during flight.

Yellow jackets are found across most of North America, Europe, and parts of Asia, commonly nesting in underground burrows, wall voids, or other enclosed cavities. Colonies are active from spring through the first hard frost, with populations and foraging activity peaking in late summer and early fall.

In spring and early summer, yellow jackets primarily hunt other insects and arthropods to feed their developing larvae, making them beneficial predators. By late summer, as colonies reach peak size and larval protein demand drops, workers increasingly seek sugary foods, which often brings them into contact with outdoor picnics and garbage areas. Colonies can become defensive and may sting repeatedly if their nest is disturbed.

Yellow jackets undergo complete metamorphosis: egg, larva, pupa, and adult. A single overwintered queen begins a nest in spring, laying eggs that hatch into legless larvae fed by the queen and later by workers; larvae pupate within paper cells before emerging as adult workers. The colony expands through summer, producing new queens and males in late summer, after which the colony declines and dies off with the onset of cold weather, leaving only newly mated queens to overwinter.