Yellow Jacket

About 3/8 to 5/8 inch long with a stocky body. They have bright yellow and black alternating bands on the abdomen, a yellow face, and relatively short legs compared to paper wasps. Workers have smooth bodies with minimal hair.

Highly aggressive, especially in late summer and fall when colonies peak. They are scavengers attracted to protein and sweets, making them common at picnics and outdoor events. They can sting multiple times and release alarm pheromones that attract more wasps.

Nests are typically underground in abandoned rodent burrows, but can also be in wall voids, attics, and under eaves. Nests are paper-based and can contain thousands of wasps by late summer.

Sustained yellow jacket activity in a specific area, especially entering and exiting a hole in the ground or a wall. Seeing a steady stream of wasps flying in a straight line to and from a point. Aggressive behavior when approaching a certain area of the yard.

Stings cause sharp pain, swelling, and redness. They can sting multiple times. Multiple stings can be life-threatening even for non-allergic individuals. Allergic reactions (anaphylaxis) can occur and require immediate emergency medical attention.

Keep garbage cans tightly sealed. Clean up food and drink spills immediately when outdoors. Avoid wearing strong fragrances. Seal gaps in walls and siding. Do not swat at them — this triggers aggressive responses. Have underground nests professionally removed.