Wyoming’s high plains and mountain meadows host butterflies that are adapted to the state’s arid conditions. If you’re wondering about the Most Common Butterflies In Wyoming, you’ll find that these resilient insects thrive from the sagebrush steppe to the alpine tundra. This guide covers the species you’re most likely to spot during a Wyoming summer.
Most Common Butterflies In Wyoming
Wyoming’s butterfly population is surprisingly diverse given the dry climate. The state sits at the crossroads of several ecological regions, which means you get a mix of western and prairie species. Here are the butterflies you’ll see most often, organized by habitat.
Meadow And Prairie Species
Open grasslands and mountain meadows are prime butterfly territory in Wyoming. These areas get plenty of sun and host the wildflowers that butterflies need for nectar.
1. Western Tailed-Blue
This small blue butterfly is everywhere in Wyoming from May to August. The males have bright blue upperwings while females are more brownish. You’ll see them fluttering low over alfalfa fields and roadside weeds.
- Wingspan: 1-1.25 inches
- Host plants: Legumes like clover and vetch
- Best time: Late spring through summer
2. Melissa Blue
Another common blue butterfly, the Melissa Blue is similar to the Western Tailed-Blue but lacks the tiny tail on the hindwing. It’s abundant in the Bighorn Basin and along the Platte River valley. Look for them nectaring on rabbitbrush in late summer.
3. Great Spangled Fritillary
This large orange butterfly with silver spots on the underside is a meadow favorite. It’s one of the bigger butterflies you’ll see in Wyoming, with a wingspan up to 3 inches. They love thistles and milkweed flowers.
Mountain And Forest Species
Wyoming’s mountain ranges, especially the Rockies and the Bighorns, host butterflies that prefer cooler conditions. These species are often found near streams or in clearings.
1. Mourning Cloak
This dark brown butterfly with a yellow border is one of the first to appear in spring. It overwinters as an adult, so you might see it on warm days in March or April. They’re common in aspen groves and along creeks.
2. Milbert’s Tortoiseshell
Similar to the Mourning Cloak but smaller, with a more orange band near the wing edge. Look for them in mountain canyons around 7,000 to 9,000 feet elevation. They like nettles as host plants.
3. Common Alpine
True to its name, this butterfly lives in high alpine meadows above treeline. It’s a brown butterfly with orange patches and eye spots. You’ll find them in the Wind River Range and the Tetons during July and August.
Urban And Garden Species
Even in Wyoming’s towns and cities, you’ll find butterflies. These species adapt well to human-altered landscapes.
1. Painted Lady
This is probably the most widespread butterfly in the world, and Wyoming is no exception. Painted Ladies migrate through the state in huge numbers some years. They visit almost any flower in gardens and parks.
2. Cabbage White
An introduced species from Europe, the Cabbage White is now one of the most common butterflies in Wyoming gardens. It’s white with black wing tips and a few spots. They’re not native, but they’re everywhere.
3. Red Admiral
This striking black-and-red butterfly shows up in yards and along river corridors. They’re strong fliers and often perch on tree trunks or fence posts. They love rotten fruit and tree sap.
Where To Find Wyoming’s Butterflies
Knowing where to look makes all the difference. Butterflies need sun, shelter from wind, and food sources. Here are the best spots in Wyoming for butterfly watching.
Best Locations By Region
- Yellowstone National Park: Over 100 species recorded, especially in the Lamar Valley and around hot springs
- Grand Teton National Park: Great for alpine species along the Teton Crest Trail
- Bighorn National Forest: Excellent for fritillaries and checkerspots in July
- Medicine Bow National Forest: Good for blues and coppers near mountain streams
- Red Desert: Surprisingly good for desert-adapted species like the Mormon Metalmark
When To Go Butterfly Watching
Timing is crucial in Wyoming because the butterfly season is short. The best months are June through August, with peak diversity in July. Here’s a seasonal breakdown:
- Late May to early June: Early species like Mourning Cloak and Spring Azure appear
- Mid-June to July: Peak season with most species flying
- August: Late-season species like the Melissa Blue and various skippers
- September: A few stragglers, especially in lower elevations
How To Identify Common Wyoming Butterflies
Butterfly identification can be tricky because many species look similar. Here’s a simple system to help you tell them apart.
Key Features To Look For
- Wing color and pattern: Is it orange, blue, brown, or white? Are there spots or stripes?
- Size: Compare to a familiar object like a quarter or your thumb
- Flight behavior: Does it fly fast and direct, or slow and bouncy?
- Perching habits: Does it land with wings open or closed?
Common Look-Alikes
Some Wyoming butterflies are easily confused. Here are the trickiest pairs:
- Western Tailed-Blue vs. Melissa Blue: Check for the tiny tail on the hindwing of the Western Tailed-Blue
- Great Spangled Fritillary vs. Regal Fritillary: The Regal has a dark band on the hindwing; it’s rare in Wyoming
- Painted Lady vs. American Lady: The American Lady has two large eye spots on the underside; the Painted Lady has four to five
Butterfly Gardening In Wyoming
You can attract more butterflies to your yard with the right plants. Wyoming’s dry climate means you need to choose drought-tolerant species that bloom all season.
Best Nectar Plants For Wyoming
- Rabbitbrush: Late summer bloomer that attracts many species
- Blanketflower: Bright red and yellow flowers that butterflies love
- Purple coneflower: Long-blooming and drought-tolerant
- Milkweed: Essential for monarchs, but also visited by other species
- Penstemon: Native to Wyoming and great for hummingbirds too
Host Plants For Caterpillars
If you want butterflies to stay and reproduce, you need host plants for their caterpillars. Here are the most important ones:
- Milkweed: For monarchs
- Nettles: For Milbert’s Tortoiseshell and Red Admiral
- Willow and cottonwood: For Mourning Cloak
- Legumes: For blues and coppers
- Violets: For fritillaries
Threats To Wyoming Butterflies
Even common species face challenges. Understanding these threats helps you appreciate why conservation matters.
Habitat Loss
Development, agriculture, and energy extraction reduce butterfly habitat. Wyoming’s sagebrush steppe has been particularly affected. Many butterflies depend on specific plants that disappear when land is converted.
Climate Change
Warmer temperatures and changing precipitation patterns affect butterfly life cycles. Some species are moving to higher elevations. Others are emerging earlier in spring, which can mismatch with their food plants.
Pesticide Use
Insecticides kill butterflies directly. Herbicides remove the plants they need. Even backyard pesticide use can harm local butterfly populations. Consider using natural pest control methods instead.
How To Photograph Wyoming Butterflies
Butterfly photography is rewarding but takes patience. Here are tips for getting good shots in Wyoming’s challenging conditions.
Equipment Tips
- Use a macro lens or a telephoto lens with close-focus capability
- A tripod helps with stability, especially in windy conditions
- A flash with a diffuser can fill in shadows on sunny days
Technique Tips
- Approach slowly and avoid casting shadows on the butterfly
- Shoot in the morning when butterflies are less active
- Focus on the eye for the sharpest images
- Use a fast shutter speed to freeze wing motion
- Try different angles to show both wing surfaces
Citizen Science And Butterfly Monitoring
You can help scientists track butterfly populations in Wyoming. Several programs welcome volunteer observations.
How To Participate
- Join the North American Butterfly Association’s count program
- Submit observations to iNaturalist or eButterfly
- Participate in the annual Fourth of July Butterfly Count
- Report monarch sightings to Monarch Watch
What To Record
- Species name (or take a photo for identification)
- Date and time
- Location (GPS coordinates are best)
- Weather conditions
- Number of individuals seen
Common Misconceptions About Wyoming Butterflies
There are several myths about butterflies that persist. Let’s clear them up.
Myth: All Butterflies Migrate
Most Wyoming butterflies do not migrate. Only a few species, like the Painted Lady and Monarch, travel long distances. Most spend their entire lives within a few miles of where they hatched.
Myth: Butterflies Only Visit Bright Flowers
While they do prefer bright colors, butterflies also visit duller flowers. Many native Wyoming plants have small, inconspicuous flowers that butterflies still use. Don’t overlook rabbitbrush or sagebrush blooms.
Myth: You Need A Big Garden To Attract Butterflies
Even a small container garden can attract butterflies. A few pots with nectar plants on a sunny balcony will bring in species like Painted Ladies and Cabbage Whites. Every little bit helps.
Butterfly Watching Ethics
When you’re out looking for butterflies, follow these guidelines to minimize your impact.
- Don’t chase or catch butterflies unnecessarily
- Stay on trails to avoid trampling habitat
- Don’t collect butterflies unless you have a scientific permit
- Photograph without disturbing them
- Report rare sightings to local experts
Resources For Wyoming Butterfly Enthusiasts
If you want to learn more, these resources are excellent.
Books
- “Butterflies of the Rocky Mountain Region” by Bob Pyle
- “A Field Guide to Western Butterflies” by the Audubon Society
- “Butterflies of Wyoming” by the Wyoming Natural Diversity Database
Online Resources
- Wyoming Natural Diversity Database: Has species lists and distribution maps
- Butterflies and Moths of North America: Good for identification
- iNaturalist: Great for recording and identifying your sightings
Seasonal Butterfly Calendar For Wyoming
Here’s what you can expect to see throughout the year. Remember that timing varies with elevation and weather.
Spring (April-May)
- Mourning Cloak
- Milbert’s Tortoiseshell
- Spring Azure
- Checkered White
Early Summer (June)
- Western Tailed-Blue
- Melissa Blue
- Great Spangled Fritillary
- Painted Lady
Late Summer (July-August)
- Common Alpine
- Red Admiral
- Various skippers
- Monarch (rare but possible)
Fall (September)
- Painted Lady (migrating)
- Orange Sulphur
- Cabbage White
- Few remaining species
Frequently Asked Questions
What is the rarest butterfly in Wyoming?
The Regal Fritillary is one of the rarest. It’s been declining across its range and is now uncommon in Wyoming. The Mormon Metalmark is also locally rare in some areas.
Are there monarch butterflies in Wyoming?
Yes, but they are not common. Monarchs pass through Wyoming during migration, mostly along the eastern edge of the state. They are more frequent in the Platte River valley and near the Nebraska border.
What is the largest butterfly in Wyoming?
The Western Tiger Swallowtail is the largest, with a wingspan up to 4 inches. It’s more common in the eastern part of the state and along river corridors. The Giant Swallowtail is even larger but very rare in Wyoming.
Can I raise butterflies in Wyoming?
Yes, but only native species. You can raise Painted Ladies or Monarchs from caterpillars. Make sure to release them where you found the caterpillars. Avoid releasing non-native species.
Why don’t I see many butterflies in my yard?
Several reasons: lack of nectar plants, too much wind, or pesticide use. Try planting native flowers that bloom from spring through fall. Create a sheltered spot with rocks or shrubs where butterflies can bask.
Final Tips For Butterfly Watching In Wyoming
Butterfly watching is a rewarding way to connect with Wyoming’s natural world. Start in your own yard or visit a nearby park. Bring binoculars and a field guide. Take notes on what you see. Over time, you’ll learn to recognize the most common species and appreciate their beauty.
Remember that Wyoming’s butterflies are adapted to tough conditions. They survive cold winters, dry summers, and strong winds. Their presence is a sign of a healthy ecosystem. By learning about them, you become a better steward of the land.
So grab your camera and head outside. The butterflies are waiting, and they have a lot to show you about life on the high plains. Whether you’re in the Bighorns or the Red Desert, you’ll find these winged jewels adding color to the landscape.