17 Types of Moths in Pennsylvania: From Giant Silk Moths to Common Household Pests
September 25, 2026
Flip on a porch light on a warm June evening in the Poconos, and something the size of a small bird might land right beside it. Pennsylvania’s moths range from six-inch giants that never eat a single meal as adults to pinhead-sized pantry raiders that can ruin a bag of flour overnight. Learning to spot the different types of moths in Pennsylvania helps homeowners, gardeners, and backyard naturalists tell a harmless silk moth from an invasive pest worth reporting.
According to Viking Pest Control, while there are over 160,000 species of moth worldwide, only 131 moth species are known to live in Pennsylvania. That figure only tracks the more commonly reported, larger species; broader photo databases that log every micro-moth and leafroller push the visible tally into the hundreds. This guide walks through 17 of the state’s most recognizable moths, from a dazzling green Luna moth drifting through a hickory forest to a quarantine-worthy invader recently confirmed in Erie County.
Pro Tip: Most large Pennsylvania moths are strongest fliers on warm, humid, low-wind nights. Checking a porch light or a gas station sign between 10 p.m. and midnight from late May through August offers the best odds of a sighting.
1. Cecropia Moth
The Hyalophora cecropia holds the title of North America’s largest native moth and belongs to the Saturniidae family of giant silk moths. Females have been documented with a wingspan of five to seven inches (13 to 18 cm) or more, making it an unmistakable sight against a screen door or window.
Cecropia moths carry a red body with white stripes, reddish-brown wings with crescent-shaped white marks, and eyespots on the upper tips of its wings. Despite the dramatic appearance, adults never bite or sting; they lack functioning mouthparts entirely, so they cannot feed and live only a week or two after emerging.
The larvae of these moths are most commonly found on maple trees, but they have been known to feed on cherry and several other hardwoods across the state. Cecropia moths share their range with several other large moth species found in Canada, since the species extends well north of the Pennsylvania border.
2. Indian Meal Moth
The Indian Meal Moth (Plodia interpunctella) is one of the smallest but most economically costly moths on this list. Rather than living in forests, it thrives inside kitchen cabinets and pantries statewide.
The most challenging Pennsylvania moth pests include the Indian meal moth who feasts on pantry staples, chewing through flour, cereal, birdseed, and dried pet food. A telltale sign of infestation is silky webbing strung across the surface of stored grains, often before any adult moths are even seen flying. For readers curious about other household invaders, this overview of different types of insects covers several other common pantry and structural pests.
3. Gypsy Moth
The Gypsy Moth (Lymantria dispar) is not native to Pennsylvania, yet it has become one of the most destructive forest pests in the state. While not native to the area, gypsy moths are everywhere in Pennsylvania, which can be quite a problem for trees and other greenery.
This invasive species is responsible for killing millions of oak, apple, and birch trees, among others, since its caterpillars strip leaves faster than trees can recover. According to The Pest Rangers, the males are brown, while the females are white with brown markings, and they do not fly, which makes the flightless females easy to spot resting on tree bark while laying eggs.
These tan-colored masses each contain between 400-600 eggs and can be found on tree trunks and rocks, so checking bark and stonework each fall is one of the simplest ways to catch an infestation early. Homeowners dealing with tree damage may also want to review this guide to insects that eat wood for comparison, since gypsy moth damage is sometimes mistaken for borer activity.
Important Note: Egg masses should be reported to a Pennsylvania Department of Agriculture office or a licensed pest control provider rather than scraped and left on the ground, since surviving eggs can still hatch nearby.
4. American Dagger Moth
The American Dagger Moth (Acronicta americana) is a plain-looking adult that hides a much more memorable larval stage. American Dagger Moths run up to about 2 inches long and can be found anywhere between spring and early autumn. These moths live in woodland areas and are plain, with dark brown, grey, and white markings.
The caterpillar tells a very different story. These insects are brightly colored, usually yellow or green, and have long black bristles. While you might be tempted to pick up one of these creatures, it’s not the best idea, since the bristles can cause skin irritation similar to a mild rash on contact. Anyone exploring Pennsylvania’s woodlands for caterpillars may also enjoy this list of insects found in neighboring Ohio, since many woodland species overlap between the two states.
5. White-ribboned Carpet Moth
The White-ribboned Carpet Moth (Mesoleuca ruficillata) is a smaller, less flashy species that still plays a role in the state’s ecosystem. The White-ribboned Carpet Moth is also on the list of types of moths in Pennsylvania. Due to its feeding habits, it belongs to the family Geometridae and is considered a minor pest species.
The White-ribboned Carpet Moth has an average wingspan of 2 inches and is gray. The wings have distinctive white stripes and a black dot near the tip. The caterpillar of this species can be identified by its green and yellow stripes and brown head and feet. These caterpillars can feed on various plants, including oak, willow, elm, cherry, and apple, which puts them in occasional conflict with backyard fruit trees. Readers who want the full roster of species can browse this complete list of moths documented in Pennsylvania for additional context.
6. Pug Moth
Pug moths belong to the genus Eupithecia, and Pennsylvania hosts a surprising number of look-alike species within this group. Pug Moth species are classified under Eupithecia spp., a designation entomologists use because so many species in the genus are nearly identical without close examination.
Most pugs are small, gray or brown, and rest with their wings held flat against tree bark or fences, where their mottled pattern works as effective camouflage. Because individual species can only be reliably told apart through wing venation or genitalia examination, most field guides group them loosely rather than attempting a photo-only identification. Anyone interested in the broader taxonomy behind moth naming conventions may enjoy this piece on the different types of moths found across North America.
7. Luna Moth
Few insects generate as much excitement among Pennsylvania naturalists as the Luna Moth (Actias luna). The Luna Moth is one of Pennsylvania’s most striking silk moths, easily recognized by its glowing green wings and graceful hindwing tails. The transparent eyespots help the moth blend into moonlit foliage, creating one of the most iconic nighttime silhouettes in eastern forests.
Adults typically measure 3–4.5 inches across, with females slightly larger than males. Their flight is slow and drifting, often appearing around forest edges, porch lights, and woodland clearings. According to Own Yard Life, in Pennsylvania, Luna Moths appear from late spring through midsummer, especially in deciduous forests rich in hickory, walnut, and birch, and are seen throughout the state but most common in rural and wooded suburban areas. Luna moths also turn up regularly in warmer states; the species is featured in this guide to moths found in Florida as well.
8. Polyphemus Moth
The Polyphemus Moth (Antheraea polyphemus) is named for the one-eyed giant of Greek mythology, thanks to the huge eyespots on its hindwings. Polyphemus Moths are easily recognized for their large, stunning eyespots. The pattern on their upper wings resembles the face of a great horned owl, a defense strategy that startles birds and other predators long enough for the moth to escape.
Its overall coloration varies from tan to reddish brown, giving individuals a wide range of appearances. With a wingspan of 4–6 inches, Polyphemus Moths are powerful fliers despite their bulky bodies. In Pennsylvania, Polyphemus Moths inhabit forests, meadows, and suburban neighborhoods from late spring through early fall. Their caterpillars feed on a wide range of trees, including oaks, maples, and birches, making them widespread across the state.
9. White-lined Sphinx Moth
The White-lined Sphinx Moth (Hyles lineata) belongs to the Sphingidae family and is one of the fastest, most agile fliers on this list. The white-lined sphinx is an attractive moth found here, with white lines and pink bands running across its body, giving it a streamlined, almost torpedo-shaped silhouette in flight.
Unlike many nocturnal moths, this species is often active at dusk and even during the day, hovering at flowers with its long proboscis extended much like a hummingbird. The species ranges far beyond Pennsylvania, and readers exploring the Southwest may recognize it from this guide to moths found in Texas, where it is one of the most frequently reported sphinx moths.
10. Common Clothes Moth
The Common Clothes Moth (Tineola bisselliella) is the species most homeowners picture when they hear the word “moth” and start worrying about their winter sweaters. According to Viking Pest, the adult clothes moths are easily identified by their narrow wings covered in hairs, and gold in color, clothes moths avoid light and seek refuge in dimly lit environments.
Pennsylvania clothing moths chew on textiles, woolens, carpets, and rugs, and these moth pests also feed on keratin, so even furs, stoles, and skins are on the menu. Their larvae range from off-white, brown, green, to pink, while adults with wings folded back run from 1/4 inch to half-inch long and generally tan or beige.
- Small, irregular holes appearing in wool sweaters, coats, or upholstery
- Silky feeding tunnels or debris trails on fabric surfaces
- Small moths fluttering weakly out of closets rather than toward lights
- Larvae found tucked into dark seams, collars, or carpet edges
Storing seasonal wool items in sealed containers and vacuuming closets regularly are two of the most effective ways to prevent an infestation before it starts.
11. Box Tree Moth
The Box Tree Moth (Cydalima perspectalis) is Pennsylvania’s newest moth-related headache and a species every boxwood owner should be able to recognize. According to Penn State Extension, the box tree moth is an invasive species native to eastern Asia, and its caterpillars are voracious feeders, capable of completely defoliating their host plants.
Once the leaves are consumed, they begin feeding on the bark, which can ultimately kill the plant, and the box tree moth’s most common host in the United States is boxwood. The box tree moth was first detected in the U.S. in 2021 in New York, and since then it has been confirmed in Michigan, Ohio, Massachusetts, Delaware, and most recently Pennsylvania.
In September 2024, the presence of this moth was confirmed in two cemeteries in Erie County, Pennsylvania, and due to its status as a federally regulated pest, Erie County is now under quarantine. Anyone who spots suspected box tree moth activity outside Erie County should follow a straightforward process:
- Photograph the caterpillar or adult moth and note the host plant, which is almost always boxwood
- Avoid moving any boxwood cuttings, plants, or trimmings off the property
- Contact the Pennsylvania Department of Agriculture or a regional Penn State Extension office
- Wait for confirmation before treating, since several native moths resemble this invasive species
Gardeners tracking this and other new arrivals may also want to check this rundown of insects found in New York, given that the moth’s initial U.S. detection happened just across the state line.
12. Imperial Moth
The Imperial Moth (Eacles imperialis) rounds out Pennsylvania’s roster of giant silk moths and belongs to the Saturniidae family, subfamily Ceratocampinae. It is found mainly in the East of South America and North America, from the center of Argentina to south Canada, making it one of the more widely distributed giant moths on this list.
The wingspan of an adult is between 80 and 175 mm (3+1⁄8 and 6+7⁄8 inches), with color patterns ranging from pale yellow to deep purple-brown blotches. Because it shares so much territory and habitat with Pennsylvania’s other giant silk moths, the table below offers a quick side-by-side comparison.
| Species | Typical Wingspan | Standout Feature |
|---|---|---|
| Cecropia Moth | 5–7 inches | Largest native moth; red body with white crescents |
| Luna Moth | 3–4.5 inches | Glowing green wings with long tails |
| Polyphemus Moth | 4–6 inches | Owl-face eyespots on hindwings |
| Imperial Moth | 3–7 inches | Yellow-and-purple mottled pattern |
For a broader sense of how many moth species exist beyond this “big four,” this piece answering how many types of moths there are puts Pennsylvania’s diversity into a global context.
13. Tussock Moth
The Banded Tussock Moth (Halysidota tessellaris), sometimes called the Pale Tiger Moth, represents one of Pennsylvania’s more common tussock species. You’ll most likely find Banded Tussock Moths in Pennsylvania in deciduous forests, and they’re active from May through August.
Identification can be genuinely tricky, since Banded Tussock Moths are nearly identical to Sycamore Tussock Moths; even experts can only tell them apart through dissection or DNA analysis. Adult moths eat nectar from flowers, but their caterpillars eat various plants, storing chemicals from those plants and passing them on to their adult form to protect themselves from predation. Adults have narrow, patterned forewings, while the fuzzy caterpillars are a familiar sight crawling across sidewalks in late summer.
14. Tiger Moth
The Isabella Tiger Moth (Pyrrharctia isabella) is best known not as an adult but as its famous caterpillar stage, the Woolly Bear. Adults have a wingspan of 1.75-2.5 in (4-6 cm), with coloring that runs orange-yellow to yellowish-brown, sparse black spotting on their wings, a line of black spots down their abdomen, bright orange forelegs, and small heads.
According to Bird Watching HQ, Isabella Tiger Moths have an interesting lifecycle that allows them to thrive even in some of the world’s coldest regions, like the Arctic, since the caterpillar can effectively freeze solid over winter and thaw out unharmed come spring. In Pennsylvania, Isabella Tiger Moths are abundant statewide, with Woolly Bear caterpillars occurring in lawns, roadsides, gardens, and open meadows, while adults appear from spring through midsummer around lights, shrubs, and woodland edges. Gardeners who enjoy tracking backyard wildlife may also like this guide to fireflies found in Pennsylvania, another summer-evening favorite.
15. Sphinx Moth
Sphinx moths, family Sphingidae, make up a large share of Pennsylvania’s overall moth diversity. Pennsylvania has about 130 moth species, with most of them being a part of the sphinx and clearwing family, which explains why gardeners so often encounter one hovering near a flowerbed at dusk.
Sphinx Moths dart through gardens at dusk, using a long proboscis to feed on deep, tubular flowers while hovering in place rather than landing. Late summer into fall remains active thanks to species such as Fall Webworms, Sphinx Moths, and hornworms that continue flying until cooler weather arrives, making them one of the last large moths still visible before frost. The caterpillars of many sphinx species are called hornworms, a name familiar to any Pennsylvania tomato grower who has found one stripping a plant overnight.
16. Clearwing Moth
The Hummingbird Clearwing Moth (Hemaris thysbe) is a daytime species so convincing that most people never realize it is a moth at all. The Hummingbird Clearwing Moth is one of Pennsylvania’s most striking day-flying moths, often mistaken for an actual hummingbird due to its hovering behavior and rapid wingbeats.
Common Mistake: Confusing a Hummingbird Clearwing Moth for a bee or a true hummingbird is easy at a glance. Checking for a moth’s fuzzy, thick body and lack of feathers, plus the way it visits one flower cluster at a time, quickly separates it from either look-alike.
Its clear wings and reddish-bordered edges make it easy to identify once spotted, with coloration that varies slightly among individuals but often includes olive, gold, and burgundy tones. Adults measure 1.5–2 inches across and are exceptionally agile fliers, hovering at flowers to sip nectar with a long proboscis, and they visit gardens frequently during daylight, especially around bee balm, phlox, and butterfly bush. Because it behaves so much like a pollinator, this species pairs naturally with a look at insects that look like bees for anyone building a backyard identification list.
17. Underwing Moth
Underwing moths, genus Catocala, are camouflage specialists that spend their days pressed flat against tree bark. Pennsylvania hosts a number of named species, including the Darling Underwing (Catocala cara) and the Oldwife Underwing (Catocala palaeogama).
Underwings flash bright hindwings from tree trunks only when disturbed, revealing a burst of orange, pink, or black pattern that vanishes the instant the moth resettles with its wings folded. This startle display is enough to make most predators hesitate, giving the moth a split second to fly off. Because their gray, bark-like forewings make daytime spotting difficult, underwings are usually found by checking tree trunks with a flashlight after dark or by searching for them at bait stations baited with fermented fruit.
Pennsylvania’s moth population reflects the same mix of native diversity and invasive concern found throughout much of the eastern United States. Readers building out a full picture of the region’s insect life may also want to compare notes with this list of moths found in Georgia or this broader survey of insects in Texas, since many species, from sphinx moths to underwings, range across multiple states.
Whether it is a six-inch Cecropia moth clinging to a porch screen or a Box Tree Moth caterpillar working through a backyard boxwood hedge, each of these 17 species tells part of the story of Pennsylvania’s night skies. Keeping a simple field guide or photo app handy during summer evenings makes it easy to build a personal checklist, and reporting anything that looks like gypsy moth egg masses or box tree moth damage helps state agriculture officials track invasive spread before it gets worse. For anyone whose curiosity extends beyond moths, this guide to Pennsylvania spiders and this look at the state’s native bee species make natural next stops for exploring the rest of the Keystone State’s backyard wildlife.