Paper Wasps in Idaho: What Treasure Valley Homeowners Should Know
Paper wasps are one of the most frequently encountered stinging insects around Idaho homes, especially during late spring and summer. Across the Treasure Valley—including Boise, Meridian, Nampa, Caldwell, Eagle, and Kuna—homeowners often notice paper wasps nesting under eaves, porches, and outdoor structures.
Paper wasps get their name from the papery material they create by chewing wood fibers and mixing them with saliva to build open, umbrella-shaped nests. While they are not typically aggressive, paper wasps will defend their nest if they feel threatened, which can lead to painful stings.
Understanding their behavior, nesting habits, and what attracts them to homes can help prevent problems before nests grow large or become hazardous.
What Is a Paper Wasp?
Paper wasps are social wasps in the genus Polistes. In Idaho, the two most common species are:
- European paper wasp (Polistes dominula) – increasingly common in Idaho and more defensive around nests
- Northern paper wasp (Polistes fuscatus) – a native species that is generally less defensive but still capable of stinging
Paper wasp nests are open and exposed, with visible hexagonal cells—unlike yellowjacket nests, which are enclosed. A single queen starts the nest in spring, and workers expand it throughout the warm months.
Although paper wasps help control caterpillars and other insects, their close proximity to homes often leads to unwanted encounters.
How to Identify Paper Wasps
Paper wasps have several features that make them easier to identify:
- Long, slender body shape
- Narrow waist between the thorax and abdomen
- Wings that fold lengthwise when at rest
- Long legs that hang down during flight
- Color patterns ranging from yellow and black to brown or reddish tones
- Typically about ¾ to 1 inch in length
In Idaho, the European paper wasp is often mistaken for a yellowjacket because of its bright yellow-and-black coloring. The key difference is body shape—paper wasps are slimmer and more elongated.
Where Paper Wasps Commonly Nest Around Homes
Paper wasps prefer elevated, sheltered areas that are protected from rain and wind. Around Treasure Valley homes, nests are commonly found in:
- Eaves and roof overhangs
- Porch and patio ceilings
- Attic vents and soffits
- Outdoor light fixtures
- Decks, pergolas, and patio covers
- Sheds, garages, and barns
- Undisturbed outdoor furniture
Nests start very small in early spring but can grow quickly through summer. Paper wasps do not reuse nests year to year. Queens overwinter in protected cracks, wall voids, wood piles, or sheltered structural gaps, then start new nests the following spring.
Do Paper Wasps Sting?
Yes. Paper wasps can sting, and their stings are painful. While they are less aggressive than yellowjackets, they will defend their nest if disturbed.
Important facts about paper wasp stings:
- Only female wasps can sting
- They do not sting to feed—only for defense
- Stings typically cause pain, redness, and swelling
- Allergic reactions are uncommon but possible
If you are stung, wash the area with soap and water, apply a cold pack, and monitor for worsening symptoms. Seek medical attention immediately if signs of an allergic reaction occur.
How to Prevent Paper Wasps Around Your Home
Prevention is the most effective way to avoid paper wasp problems. Idaho homeowners can reduce nesting by:
- Inspecting eaves, soffits, and outdoor structures in early spring
- Removing very small starter nests before workers emerge
- Sealing cracks and gaps where queens may overwinter
- Reducing clutter in outdoor storage areas
- Cleaning outdoor eating and grilling areas to reduce prey insects
- Occasionally moving or rearranging outdoor furniture and décor
Early-season inspections are especially helpful and can prevent nests from developing in hard-to-reach areas.
How to Safely Handle Paper Wasp Nests
Because paper wasps defend their nests, removal should always be approached with caution.
Very Small Nests in Early Spring
When only a single queen is present, some homeowners can safely remove small starter nests by:
- Treating the area at dawn or dusk when wasps are least active
- Wearing protective clothing
- Ensuring the wasp is inactive before removing the nest
Avoid Removing Larger Nests
Larger nests with multiple workers are dangerous to disturb. Avoid:
- Spraying nests with water
- Swatting or knocking nests down during the day
- Attempting removal without protective equipment
When to Call a Professional
Professional removal is strongly recommended if:
- The nest is near doors, walkways, or play areas
- The nest is located high or is difficult to access
- A household member has a known sting allergy
- The nest is large or activity is heavy
Pestcom Pest Management provides safe, effective wasp control and removal for homes throughout the Treasure Valley. If you’re dealing with recurring wasp activity or an established nest, a professional inspection can reduce risk and prevent future nesting.
Related pages: Pest Resources | Wasp Control | Contact Us