Not every wasp nest requires removal. Paper wasps under a high eave that no one walks near are actively hunting caterpillars and other garden pests — they're free pest control. Mud daubers are solitary, rarely sting, and prey on spiders. Cicada killers look terrifying but males can't sting at all.
The question isn't "is there a wasp nest?" It's "does this nest create a stinging risk where people or pets spend time?"
Treat if: The nest is near a doorway, walkway, play area, or outdoor eating area. Nests inside wall voids, soffits, or the ground near paths. Anyone in the household has a bee/wasp sting allergy. Yellow jacket nests (ground or wall void) — yellow jackets are defensive and aggressive, especially in late summer when colonies are largest.
Leave alone if: The nest is high on a tree branch, under a roofline away from foot traffic, or in an area nobody uses. Paper wasp nests at high elevation cause no problems and will be abandoned after the first hard frost anyway — wasps don't reuse nests.
Timing: Treat at dusk or after dark when all workers have returned to the nest and are least active. Never treat during the day when workers are flying — they will defend the nest aggressively. Use a red-filtered flashlight (wasps can't see red light) to approach the nest at night.
Approach distance: Stand at least 6 feet away for aerial nests. Most wasp sprays (Spectracide, Raid Wasp & Hornet) shoot a stream 15–20 feet — use that distance. For ground nests, approach from the side, not directly over the entrance.
Protective clothing: Long sleeves, pants tucked into socks, closed-toe shoes, and gloves. A hat reduces the chance of a wasp getting tangled in your hair (which triggers defensive stinging). If treating a large nest, a bee veil ($15–20) provides excellent face protection.
Application: Spray directly into the nest entrance for 5–10 seconds. For paper wasp nests, saturate the entire nest surface. Walk away immediately after spraying — don't stand and watch. Return the next day to confirm the nest is dead (no activity) before removing it.
Most wasp stings cause localized pain, swelling, and redness that resolves in hours. Clean the area, apply ice, and take antihistamine (Benadryl) if swelling is uncomfortable. Unlike bees, wasps don't leave a stinger — no need to scrape.
Seek emergency care immediately if: Swelling spreads beyond the sting site, difficulty breathing, throat tightness, dizziness, rapid heartbeat, or nausea/vomiting. These are signs of anaphylaxis — a life-threatening allergic reaction requiring epinephrine. People with known sting allergies should carry an EpiPen outdoors during wasp season. See our complete sting response guide.