18 Types of Moths in Oregon: From Giant Silk Moths to Garden Pests
October 13, 2026
Step outside on a mild Oregon evening and a moth the size of a small bird might bump against the porch light. Oregon’s forests, meadows, and backyards support a striking range of different types of moths, from palm-sized silk moths to tiny pantry invaders that never leave the kitchen. Anyone curious about the types of moths in Oregon will find species shaped by everything from old-growth Douglas-fir stands to coastal ceanothus thickets.
Some of these moths are native giants with eyespots built to startle predators, while others arrived from Europe and now show up in nearly every backyard trap. A few are famous as caterpillars long before anyone notices the adult moth. The list below covers 18 species Oregon residents are likely to encounter, with notes on where each one lives, what it eats, and how to tell it apart from its lookalikes. For a sense of how this fits into the bigger picture, how many types of moths exist worldwide puts Oregon’s roster into perspective.
1. Polyphemus moth
The Antheraea polyphemus is hard to miss once it lands. This giant silk moth has a furry, tan-to-brown body and a wingspan that can reach six inches, with a pair of large, translucent eyespots on its hindwings. According to Pacific Northwest Moths, Antheraea polyphemus is widely distributed throughout the Pacific Northwest, extending north to northeastern British Columbia, and is only absent from dry steppe in the interior of the region such as much of southern Oregon.
Western Oregon’s hazelnut orchards occasionally see large population swings in this species, and the caterpillars feed on oak and a range of other deciduous trees and shrubs. When an Oregon Invasive Species Hotline user asked about a moth found at a Portland park, an Oregon State University entomologist identified it as Antheraea polyphemus, noting it is the Pacific Northwest’s largest silk moth and is native, which is a useful reminder that even dramatic-looking insects showing up in a city park are often harmless locals rather than invaders. You can read the full exchange on the Oregon Invasive Species Hotline.
Pro Tip: Giant silk moths like the Polyphemus moth are nocturnal and drawn to light, so checking porch lights and gas station windows on summer mornings is one of the easiest ways to spot one before it flies off at dusk.
2. Ceanothus silk moth
The Hyalophora euryalus is another of Oregon’s giant silk moths, and it can be just as startling to find resting on a wall. According to Wikipedia, it is a reddish-brown moth with black and white patterning spots, and the edges of the wings vary from light brown to gray. A white, pointed streak on the hindwing helps separate it from the closely related Cecropia moth.
Caterpillar host plants explain the “ceanothus” in its name, though the species is far from picky. The Friends of the Regional Parks Botanic Garden notes that it has a large variety of host plants including Ceanothus, Manzanita, Gooseberry, Madrone, Willow, Alder, and Mountain Mahogany. Because ceanothus shrubs are also prime nectar sources for native pollinators, gardeners who plant for types of bees in Oregon often end up hosting this silk moth’s caterpillars without realizing it.
3. Sheep moth
The sheep moth, Hemileuca eglanterina, breaks the giant-silk-moth mold by flying during the day instead of at night. Its wings carry bold bands of pink, yellow, and black, making it one of the most colorful moths found in Oregon’s open meadows and brushy slopes. Spiny, striped caterpillars feed on wild rose, ceanothus, and willow before the adults emerge in late summer.
Because it flies in bright daylight and shows off such vivid colors, the sheep moth is often mistaken for a butterfly by casual observers. Birders and backyard watchers tracking types of finches in Oregon sometimes spot this moth feeding alongside the same wildflowers finches visit for seeds and insects.
4. White-lined sphinx moth
Few moths are as easy to confuse with a hummingbird as the white-lined sphinx, Hyles lineata. It hovers at tubular flowers at dusk, wings blurring as it feeds, with grayish-brown forewings streaked in white and pink-tinged hindwings. The sphinx moth family as a whole has a reputation for speed; as the Wild Columbia County guide puts it, Silk Moths and Sphinx Moths are some of the largest local species and, in the case of Sphinx Moths, some of the fastest as well.
Caterpillars, sometimes called hornworms, feed on evening primrose, apocynum, and a wide range of garden plants, which is why the species turns up across nearly the entire United States. The same wide range applies farther south, where types of moths in Texas include this sphinx moth as one of the most commonly reported species on both coasts.
5. One-eyed sphinx moth
The one-eyed sphinx, Smerinthus cerisyi, gets its name from a single blue eyespot ringed in black on each hindwing, usually hidden beneath grayish-brown forewings until the moth is disturbed. Flashing that spot is a startle display meant to make a hungry bird think twice. Caterpillars feed on willow and poplar, which keeps this species tied closely to Oregon’s streamside and wetland edges.
That riparian habit puts the one-eyed sphinx moth in the same willow-lined corridors favored by many amphibians, including several of the types of frogs in Oregon that rely on the same wet, shaded understory for cover.
6. Sequoia sphinx moth
Despite the name, the Sequoia sphinx moth, Sphinx sequoiae, is tied less to giant sequoias and more to incense cedar and other western conifers that its caterpillars feed on. Adults are large, gray-bodied moths typical of the sphinx family, with narrow, swept-back wings built for fast, direct flight between conifer stands.
Because this species depends on mature conifer forest for its larval host trees, its presence is often used as a rough indicator of forest health in the areas it occupies. That connection to old, intact habitat links it loosely to broader conversations about endangered animals in Oregon and the forest conditions many sensitive species depend on.
7. Great ash sphinx moth
The great ash sphinx, Sphinx chersis, ranks among the larger sphinx moths found in Oregon, with a gray, mottled body and forewings patterned to resemble tree bark at rest. Caterpillars feed on ash, lilac, and privet, so backyard lilac hedges can unexpectedly host a few of these fat, horned larvae by late summer.
This species ranges well beyond the Pacific Northwest and turns up in similar form wherever its host plants grow. Enthusiasts comparing notes on the types of moths in Colorado often list the great ash sphinx among the shared species that bridge both regions’ moth communities.
The table below compares the seven large-bodied giant silk moths and sphinx moths covered so far, which are some of the easiest Oregon moths to spot thanks to their size.
| Common Name | Moth Group | Typical Wingspan | Caterpillar Host Plants |
|---|---|---|---|
| Polyphemus Moth | Giant Silk Moth | 4–6 inches | Oak, deciduous trees |
| Ceanothus Silk Moth | Giant Silk Moth | 3.5–5 inches | Ceanothus, manzanita, willow, alder |
| Sheep Moth | Day-Flying Silk Moth | 2–3 inches | Wild rose, ceanothus, willow |
| White-Lined Sphinx Moth | Sphinx Moth | 2.5–3.5 inches | Evening primrose, apocynum |
| One-Eyed Sphinx Moth | Sphinx Moth | 2–3 inches | Willow, poplar |
| Sequoia Sphinx Moth | Sphinx Moth | 3–4 inches | Incense cedar, conifers |
| Great Ash Sphinx Moth | Sphinx Moth | 3.5–4.5 inches | Ash, lilac, privet |
8. Isabella tiger moth
Almost everyone has met the Isabella tiger moth, Pyrrharctia isabella, without knowing its name, because its caterpillar is the famous woolly bear, the fuzzy orange-and-black band of folk weather lore. The adult moth is a plain tan to orange insect with a few small black spots, easy to overlook compared to its caterpillar’s fame.
Woolly bears overwinter as caterpillars, which is part of why they show up crossing roads and sidewalks in fall as they search for shelter. This species ranges across nearly the entire continental United States, and moth-watchers tracking the types of moths in Kansas report the same familiar woolly bear turning up on Midwest sidewalks each autumn.
9. Virginian tiger moth
The Virginian tiger moth, Spilosoma virginica, is a plain white moth with a handful of small black dots scattered across its wings and body, easy to mistake for several other white moths on a porch screen. Its caterpillar, often called the yellow woolly bear, is pale yellow to cream-colored and nearly as generalist an eater as the Isabella tiger moth’s caterpillar.
Because this species feeds on such a wide range of garden and wild plants, it shows up across most of North America in similar form. Comparisons with the types of moths in Georgia list this species as one of the more consistently reported white moths on the East Coast as well.
10. Fall webworm moth
The fall webworm moth, Hyphantria cunea, is a small white moth that draws far more attention as a caterpillar than as an adult. Its larvae spin large, loose silk webs over the tips of tree branches in late summer and early fall, often on alder, walnut, or fruit trees, and the webs can look alarming even though the damage is usually cosmetic.
Identifying a fall webworm colony comes down to a few consistent clues:
- Webbing appears at branch tips rather than in the crotch of major limbs
- Webs expand through late summer as the colony grows
- Frass and chewed leaves collect inside the silk tent
- Host trees are usually deciduous hardwoods, not conifers
This species ranges across most of temperate North America, and reports from types of moths in Michigan show the same late-season webbing pattern on hardwood trees there.
11. Salt marsh moth
The salt marsh moth, Estigmene acrea, is another white-winged species, distinguished from its tiger moth relatives by scattered black spots and yellow-orange hindwings with dark markings along the edge. Despite the name, it is not limited to coastal marshes and turns up in fields, gardens, and open grassland across Oregon.
Its caterpillar is a dense, fuzzy woolly bear type that feeds on an unusually broad diet, including vegetables, weeds, and ornamental plants. Wetland and marsh habitats where this species is most abundant overlap with the foraging grounds used by several types of herons in Oregon, which hunt the same damp margins for insects and small prey.
12. Yellow-collared scape moth
The yellow-collared scape moth, Cisseps fulvicollis, is a small, dark day-flying moth with a bright orange-yellow collar just behind the head, a pattern that makes it look more like a wasp than a moth at first glance. That resemblance likely helps it avoid predators that would otherwise treat it as easy prey.
Caterpillars feed on grasses and sedges in damp meadows and roadside ditches, habitats where this moth often flies alongside other wasp-mimicking insects. The same mimicry strategy shows up among several types of flies in Oregon, which use similar black-and-yellow patterning to discourage predators.
13. American lappet moth
The American lappet moth, Phyllodesma americana, is a master of disguise rather than color. Its scalloped, ragged wing edges and mottled brown pattern make a resting adult look almost exactly like a curled dead leaf clinging to a branch. Caterpillars feed on willow, oak, and birch, and they share the same leaf-mimicking instinct as the adult moth, flattening themselves against bark to disappear.
This camouflage strategy is common enough among forest-floor insects that it shows up across unrelated groups facing similar predator pressure.
14. Indian meal moth
Unlike every other species on this list, the Indian meal moth, Plodia interpunctella, is more likely to be found in a kitchen cabinet than outdoors. It has a small, two-toned wing pattern, reddish-copper on the outer half and pale tan near the body, and it is one of the most common stored-product pests in North American homes.
Larvae feed on dried grains, cereal, pet food, and dried fruit, spinning visible silk threads through contaminated packages. It is worth noting that this species is unrelated to the clothes moths covered in a separate guide to types of moths that eat clothes, since Indian meal moths target pantry goods rather than fabric.
15. Large yellow underwing
The large yellow underwing, Noctua pronuba, is a European species that has become one of the most commonly trapped moths in North America since its introduction. Brown, mottled forewings conceal bright yellow-orange hindwings edged in black, a flash of color visible only when the moth takes flight.
Key Insight: This species was accidentally introduced to Nova Scotia in the 1970s and has since spread across most of the continental United States, including Oregon, making it one of the most widespread non-native moths now reported in backyard light traps.
Caterpillars are cutworms that feed at night on grasses and garden plants, often tunneling just below the soil surface during the day. Gardeners dealing with types of ants in Oregon sometimes notice both insects sharing the same disturbed, grassy soil where cutworms hide.
16. Douglas-fir tussock moth
The Douglas-fir tussock moth, Orgyia pseudotsugata, is a native forest insect whose caterpillars periodically erupt in outbreaks across Pacific Northwest Douglas-fir and true fir stands, stripping needles from thousands of acres in bad years. Adult females are flightless and wingless, while males are small, grayish-brown moths that fly in search of mates.
Important Note: Tussock moth caterpillars carry barbed hairs that can cause skin rashes or eye irritation in sensitive people. It is best to avoid handling the fuzzy larvae directly, especially during outbreak years when caterpillar numbers are high.
Because outbreaks affect so much standing timber, this species is closely monitored by forest health programs. Birds of prey that patrol these same forest edges, including several types of hawks in Oregon, take advantage of outbreak years when caterpillar numbers spike.
17. Western tent caterpillar moth
The western tent caterpillar moth, Malacosoma californicum, belongs to the tent caterpillar family, a group closely related to the silk and sphinx moths covered earlier. As the Wild Columbia County guide notes, silk and sphinx moths are related to Superfamily Lasiocampidae, the Tent Caterpillars, which includes this species.
Its life cycle follows a predictable seasonal pattern:
- Egg masses overwinter on twigs, laid by females the previous summer
- Caterpillars hatch in early spring as host trees leaf out
- Larvae build a silk tent in branch forks for shelter between feeding bouts
- Caterpillars leave the tent to pupate by late spring
- Adult moths emerge, mate, and lay the next generation’s eggs
Predatory insects and spiders take a steady toll on tent caterpillar colonies each spring, and anyone cataloguing types of spiders in Oregon will find several web-builders that regularly pick off caterpillars near active tents.
18. Cinnabar moth
The cinnabar moth, Tyria jacobaeae, stands out with black wings marked by bold red stripes and spots, a warning pattern that signals toxicity to predators. It was deliberately introduced to parts of the Pacific Northwest, including Oregon, as a biological control agent against tansy ragwort, a toxic invasive weed that poisons livestock.
Striped orange-and-black caterpillars feed exclusively on tansy ragwort and related plants, absorbing the plant’s toxins and storing them as a defense of their own. Because this moth was introduced specifically to manage an invasive weed, it is often cited in discussions about biological control tools used to protect native habitat tracked under endangered animals in Oregon conservation efforts.
| Common Name | Native or Introduced | Primary Impact |
|---|---|---|
| Fall Webworm Moth | Native | Cosmetic webbing on hardwood branch tips |
| Salt Marsh Moth | Native | Broad-diet caterpillar in fields and gardens |
| Large Yellow Underwing | Introduced (Europe) | Cutworm damage to grass and garden plants |
| Douglas-Fir Tussock Moth | Native | Periodic defoliation of conifer forests |
| Western Tent Caterpillar Moth | Native | Spring defoliation, visible silk tents |
| Cinnabar Moth | Introduced (biocontrol) | Targets toxic tansy ragwort |
Oregon’s moths range from six-inch giants with owl-like eyespots to pantry stowaways barely visible in a cereal box. Learning to tell a native Polyphemus moth from an introduced large yellow underwing, or a helpful cinnabar moth from a damaging tussock moth, makes evening porch-light watching far more rewarding. For readers exploring wildlife beyond moths, guides covering types of snakes in Oregon and other local species round out a fuller picture of what shares the backyard after dark.