STINGING INSECT GUIDE

Red wasp

Identification, local timing in San Antonio and the Hill Country, risk profile, and exactly how we treat it.

Scientific names: Polistes carolina (Carolina red paper wasp), P. rubiginosus (mahogany wasp / red paper wasp), P. perplexus (fine-backed red paper wasp). Common names: Red wasp, red paper wasp, Carolina red wasp, mahogany wasp. Family: Vespidae (subfamily Polistinae). Status in the San Antonio / Boerne corridor: These wasps are native and abundant. They’re actually the most common paper wasp species around here.

At a glance #

Why this species gets its own guide #

In Central Texas, folks often refer to "red wasps" and "paper wasps" as separate types. They aren't completely off base.

All red wasps are paper wasps (genus Polistes), but Polistes carolina stands out. I've noticed that it and its close relatives behave and look different from other local paper wasps like the Guinea wasp (P. exclamans), the metric paper wasp (P. metricus), and the Apache wasp (P. apachus). Treating them all as the same is a mistake.

Texans often look up "red wasp" on its own. They have different descriptions for the sting. Nests pop up in various spots. In the Hill Country, the paper wasp you'll run into most often is the red wasp — roughly 60–70% of our paper wasp calls in this area are about red wasps.

Identification #

The color is the fastest ID. Red wasps are a solid reddish-brown to deep mahogany from head to abdomen. You won't see any yellow banding or stripes — just a consistent rust-red. Their wings, when folded, are a dark brown or smoky black, which is pretty unusual for paper wasps and helps confirm their identity.

The three look-alikes and how to tell them apart:

• **Guinea paper wasp (P. exclamans):** This one’s smaller and has yellow markings on its head, thorax, and abdominal bands. If you spot yellow, it's definitely a Guinea wasp, not a red wasp.
• **Apache paper wasp (P. apachus):** Larger in size, with yellow-and-brown banding and a unique color pattern — definitely not solid mahogany.
• **Mahogany wasp (P. rubiginosus):** Very similar to P. carolina. Practically speaking, we treat them the same. They only differ in the ridges on the propodeum (the plate behind the thorax) — fine ridges for P. carolina and coarser for P. rubiginosus. Locals call both "red wasps," and neither seems to mind the mix-up.

All red wasps have that classic paper-wasp shape — a long, slender body with a pinched waist and long legs that hang down while they fly. You can tell males and females apart: females have shorter antennae and more triangular faces, while males sport longer, slightly hooked antennae and squarish faces. Keep in mind, only females can sting.

Biology and behavior #

Life cycle #

Red wasps have a life cycle similar to that of paper wasps, but there are some important differences for P. carolina:

• Founding phase: Red wasp foundresses start coming out of hibernation around February–March in the San Antonio area. Founding can happen in two ways: haplometrotic, where one queen goes solo, or pleometrotic, where multiple queens team up. When they do work together, they establish a linear dominance hierarchy.
• Worker phase: The first workers show up in late May. These are all sterile daughters of the foundress.
• Reproductive phase: This occurs in late summer when new queens and males are produced.
• Intermediate phase: During this phase, males and older queens die off. The new queens mate and prepare to overwinter.

A unique trait of P. carolina is that multiple foundresses can kick off a nest together, each having mated on their own. This results in a genetic connection among cofounding foundresses of about 0.75—less than full sisters but significantly more than random wasps. According to University of Florida Entomology, this close genetic tie likely explains why red wasp cofoundresses work together so harmoniously, unlike other Polistes species where foundresses often clash.

An unusual behavioral note #

Most Polistes species prefer to feed their own larvae. I've seen it where a mother can tell which cells hold her eggs and puts more resources there. Red wasps don't operate that way. When multiple foundresses share a nest, they feed any larva without caring about who the biological parent is. This kind of teamwork is rare among social wasps and helps keep red wasp colonies more peaceful than many other paper wasp species.

Nest preferences — the "concealed" specialist #

Red wasps stand out from other local paper wasps in a big way. They like to build their nests in concealed, sheltered locations. While Guinea paper wasps might choose an open spot like your front-door soffit, red wasps usually opt for a more protected area:

• Inside attic vents like gable louvers, ridge vents, and soffit vents.
• Inside hollow porch columns.
• Behind shutters.
• Inside wall voids, accessed through a small gap or crack.
• In disused chimneys and flue openings.
• Inside storage sheds, especially in roof cavities.
• Inside hollow trees.

This creates a specific service problem: red wasp nests are often invisible from the outside. I've had homeowners tell me they see "wasps coming and going under my siding" but can't find an actual nest. The comb is usually hidden inside a cavity, anywhere from 6 to 18 inches in from that entry point. It's easy to mistake these nests for "bees in the wall" — red wasps entering and exiting a small hole in stucco can easily look like a honey bee colony from a distance.

Diet and hunting #

Red wasps love to sip on nectar and tree sap. Their larvae get a diet of chewed-up insect prey, mostly caterpillars, but they also munch on Chrysomelidae (leaf beetle) larvae and, surprisingly for paper wasps, cicadas. According to Penn State Extension, in the summer, a red wasp colony can clear out hundreds of caterpillars from nearby plants every week. This makes them pretty effective at keeping caterpillar populations in check in gardens and agricultural areas.

"Extremely aggressive" — the reality check #

Wikipedia and some pest control sources call red wasps "extremely aggressive." That’s partly true, but it needs context.

Red wasps are defensive, not aggressive. If you spot a red wasp foraging on a flower, don't worry — she won't pay you any mind. You could stand right next to her, and she won't even notice. The reputation for "aggression" comes into play when a nest is disturbed, and it's worth noting that this behavior is more about protecting their home than seeking out trouble.

• Disturbing a red wasp nest triggers a stronger defensive response than messing with a Guinea wasp or metric paper wasp nest.
• The defensive radius around a red wasp nest is bigger—about 10–15 feet, compared to 5–8 feet for other paper wasps.
• Red wasps will chase you down a bit farther, too.
• If you get stung, you're more likely to receive multiple stings from red wasps than from other paper wasps.

Red wasps are definitely less defensive than yellowjackets. When you stack them up against Africanized honey bees, they don’t even come close. It’s true that red wasps are the most aggressive paper wasps in Texas. But calling them "dangerous" only holds up if you’re within 15 feet of their active nest.

The sting #

Here is where red wasps earn their reputation. The red wasp sting rates between 2.5 and 3.0 on the Schmidt Pain Index — that’s significantly higher than the 2.0 rating most paper wasps, yellowjackets, and honey bees receive. According to Wikipedia, people who’ve been stung, including Justin Schmidt himself, often describe the red wasp sting as:

• Sharp, hot, burning — it feels more like a burn than a sting.
• Lingering — while most paper wasp stings fade in 10–20 minutes, red wasp pain can hang around for 45–60 minutes.
• Deeper aching follows the initial burn, and it can last for hours.

The reason this species has a more painful sting isn't entirely clear. Their venom is similar to other Polistes, yet studies consistently show higher pain levels. Schmidt described red wasp venom as "caustic and burning, with a distinctly bitter aftertaste… Like spilling a beaker of hydrochloric acid on a paper cut." This description pops up often in entomology and, from what I've heard from folks who've been stung, it hits the mark.

Local context — San Antonio and the Hill Country #

Red wasps are the most common paper wasp you'll find from San Antonio to Kerrville. They usually outnumber all other Polistes species combined on most homes.

Where red wasps concentrate locally:

• Boerne historic district (Main Street, Hauptstrasse): Every summer, we see red wasps in the attic vents and soffit returns of these limestone buildings. It happens every year, on the same structures.
• Fair Oaks Ranch custom homes: Gable louvers, chimney caps, and hollow porch columns are popular spots. Red wasps are experts at finding any attic-access point on those complex custom roofs.
• Stone Oak / Sonterra: We often find nests in pool cabana interior rafters, outdoor kitchen roof cavities, and covered patio soffits.
• Bulverde and Spring Branch acreage: Inside barn and pole-building rafters, red wasp nests can grow to over 200 adults by late summer.
• Dominion / Leon Springs: Luxury outdoor structures, like pavilions and pergolas with finished soffits, are common nesting sites, along with outdoor fireplaces that have voids behind the stone veneer.
• Kerrville and Comfort: Historic downtown buildings often have nests in the eaves and attic spaces.
• New Braunfels Gruene district: The historic limestone and wood-frame buildings here have eaves and attic returns that attract these pests.

In Central Texas, I've seen a common pattern with red wasps. A homeowner might spot "some wasps" buzzing in and out of an opening in the soffit, gable, or siding. When you take a closer look, you could see around 15 to 30 wasps flying in and out each hour. The nest usually hides 6 to 24 inches inside the cavity, making it tough to spot from the outside. Inside, there can be anywhere from 30 to 150 adult wasps along with comb that holds developing brood.

Risk to humans and pets #

Moderate to moderately-high. A red wasp sting hurts more than your typical wasp sting. We see more multi-sting incidents with these guys because their nests often end up in places where people stumble upon them — like when you're working in your attic or fixing something high up. I've heard plenty of stories about homeowners on a ladder, cleaning out gutters or repairing soffits, who accidentally disturb a hidden nest and end up with 3 to 10 stings before they can get away.

People who are allergic to stings need to be extra cautious. They can suffer more from the venom in each sting, and there's a higher chance of getting stung multiple times in one go.

Treatment approach #

Red wasp treatment differs from other paper wasp treatment in ways that matter:

• Identify the actual nest location first. Spraying an exterior aerosol at the visible entry point won’t do anything if the colony is 12 inches deep inside an attic vent. You need to get the product to the comb for it to work.
• Dust formulation inside cavities: For places like attic vents, soffit returns, hollow columns, and wall voids, we apply insecticidal dust through the entry point. This way, it reaches the comb and contacts the returning workers. Aerosols work for exposed nests, but they fall short for hidden ones.
• Dusk or dawn treatment: Most workers are around the nest inside the cavity during these times. Treating at midday misses a big part of the colony and leads to poor kill rates.
• Physical nest removal after treatment is a must. Leaving a dead colony with brood in an attic void can create odor problems, attract other pests, and mark the spot for next year’s queens.
• Preventive residual treatment on attic vents, gable louvers, soffit returns, and common hiding spots during the March–May foundress period is the best long-term control strategy. Stopping a queen before she starts a colony is way easier than getting rid of an established one.
• Fall sealing of attic vent screens, soffit gaps, and eave cavities cuts down on the number of queens that overwinter for the next spring.

Odd, funny, and genuinely true #

• Red wasps are attracted to loud noises. Unlike most insects, Polistes carolina is drawn toward loud sounds, bright colors, and strong sweet smells — including perfume, cologne, and food. A running lawnmower, a tractor, a power saw, or even a loud voice can draw red wasps from 20–30 feet away.
• Red wasps are attracted to humans specifically. Not a joke. Scientific literature notes that the species is "attracted to humans due to loud noises, bright colors, and sweet smells, such as food and perfume." If you've ever been swarmed by red wasps at a summer barbecue in Boerne, that's why.
• Red wasps can recognize repeated threats. Observations and controlled experiments suggest red wasps remember the location of previous disturbances for days afterward. Destroying an early-season nest in a particular soffit can make foundresses more defensive in that same location the following year — though whether this is memory, scent-marking, or site-selection bias is still debated.
• The "umbrella" shape is a stalk engineering problem. A red wasp nest hangs from a single thin stalk that the queen constructs first. That stalk must support the entire weight of the nest plus all workers on it. Queens test the stalk's strength repeatedly during construction by pulling on it with her mandibles; a stalk that fails produces a nest collapse and colony loss.
• Red wasps chew plant stems to collect wood fiber for nest paper. Unlike most paper wasps, which scrape old weathered wood, red wasps sometimes prefer fresh plant stems, particularly from roses and other landscape shrubs. This can cause minor cosmetic damage to prized garden plants.
• The red color is aposematic — a warning signal. Reddish-brown coloration across the insect world often signals "I sting and you'll regret bothering me." Predatory birds and small mammals that learn the association avoid red wasps after a single encounter. The coloration is doing active deterrent work.
• A red wasp foundress who loses her nest mid-season has limited options. She can try to rebuild (time-consuming and often unsuccessful), or she can invade another red wasp's nest and attempt to take over as a subordinate or by force. The second strategy is documented but rare; most nest-loss events end the foundress's reproductive year.
• Red wasp colonies can reach 200+ adults in a single season under ideal conditions. That's on the high end for paper wasps — about double the average colony size. Hill Country barn colonies routinely reach this size because the enclosed, undisturbed space lets the colony grow through summer without interruption.
• Red wasps have been introduced to Bermuda. Human-assisted, accidentally. A red wasp population has established there and persists outside its native range.
• "If you have a red wasp problem, wait until dark." This is the single most-repeated piece of pest control advice specific to this species. Red wasps' concealment-nesting habit plus their defensive daytime behavior means that homeowner intervention during daylight hours is reliably the worst approach. Nighttime treatment, with cool temperatures and workers clustered on the comb, is dramatically safer and more effective — for professionals. It is still not a good DIY task.

Common questions customers ask #

• Red wasps and paper wasps are different. Red wasps are usually more aggressive, while paper wasps tend to be more docile.
• A red wasp sting can be quite painful. It’s sharper than a yellowjacket sting and can hurt for hours.
• If you find red wasps in your attic, it’s best to call a professional. They can be tricky to handle on your own.
• Red wasps are generally larger and more robust than yellowjackets. Check for their nests too; red wasps make open, umbrella-shaped nests.
• Red wasps are attracted to sweet foods, open trash cans, and sheltered spaces for nesting.
• You can try to get rid of red wasps yourself, but it can be risky. I’ve seen people get stung because they didn’t take proper precautions.
• Yes, red wasps often return to the same spot to nest year after year if it’s a good location.
• Red wasps can sting dogs, but they usually won’t unless provoked. Keep an eye on your pets around their nests.

We’ve pulled information from a variety of sources for this guide. These include the Polistes carolina Wikipedia page, which cites Linnaeus's original description from 1767 and Saussure's placement of the genus in 1855. We also looked at the Texas A&M AgriLife Extension Field Guide to Common Texas Insects, the Schmidt Sting Pain Index (Schmidt, The Sting of the Wild, 2016), and the Texas Parks and Wildlife Magazine's Wild Thing series on Polistes carolina sting ratings from July 2015. Additionally, we considered peer-reviewed studies on Polistes kin recognition and cooperative founding behavior.

Frequently asked questions #

How can I identify a red wasp? #

Red wasps are typically around 1 inch long with a slender body. They have a reddish-brown coloration and long legs. You’ll often see them building their nests in sheltered areas, like under eaves or in tree branches.

What time of year are red wasps most active in San Antonio? #

In San Antonio, red wasps are most active from late spring through early fall. You'll likely see them foraging for food during warmer months, especially as they prepare their nests for the season.

Are red wasps aggressive, and how can I avoid attracting them? #

Red wasps can be defensive if they feel their nest is threatened, but they aren't usually aggressive unless provoked. To avoid attracting them, keep food covered when outdoors and seal potential nesting sites around your home.

What should I do if I find a red wasp nest on my property? #

If you find a red wasp nest, it's best to avoid disturbing it. We recommend contacting a professional pest control service to safely remove the nest, especially if it’s in a high-traffic area or poses a risk to your family.

How much does it cost to treat a red wasp infestation in the Texas Hill Country? #

The cost for treating a red wasp infestation can vary based on the size of the nest and its location. Generally, we provide a free estimate after assessing the situation, so you’ll know what to expect before we start any work.

Last reviewed April 25, 2026 by Travis Lambert (Owner).