• Photo of park visitors enjoying sunset from the Alpine Ridge Trail in Rocky Mountain National Park.

    Rocky Mountain

    National Park Colorado

There are park alerts in effect.
hide Alerts »
  • Impacts from September 2013 Flood - Old Fall River Road, Alluvial Fan and Trails

    Select this link to learn More »

Butterfly Families

For a complete list of the park's documented butterfly species, click here.

Hesperiidae (The Skipper Family)

 
a photo of a Snow's Skipper butterfly (Paratrytone snowi)

Snow's Skipper (Paratrytone snowi)

R. Bray

Skippers are in the Hesperiidae family. They look and fly like moths. They have hooked antennae. In the park, most species are small and black or earth-toned.

 
Papilionidae (The Swallowtail Family)
 
a photo of a Western Tiger Swallowtail (Papilio rutulus)

Western Tiger Swallowtail (Papilio rutulus)

R. Bray

Swallowtails are large and strong fliers with trailing tails. Four species are commonly seen in the park in patterns of black and yellow. Look for them in the montane life zone.

 
 
a photo of Rocky Mountain Parnassian (Parnassius smintheus)

Rocky Mountain Parnassian (Parnassius smintheus)

R. Bray

An exception in the park Swallowtail family is the Rocky Mountain Parnassian, which lacks a tail and is found in all the park's life zones: montane, sub-alpine and alpine. It can often be seen in numbers on the tundra, flying across Trail Ridge Road.
 
Pieridae (The Sulphur and White Family)
 
a photo of Alexandra's Sulphur butterfly (Colias alexandra)

Alexandra's Sulphur (Colias alexandra)

R. Bray

The Sulphur and White Family has 12 species commonly found in the park. They are mostly medium in size and hard to tell apart. Their colors range from yellow to orange to white.
 
Lycaenidae (The Gossamer Wing Family)
 
a photo of a Greenish Blue butterfly (Plebejus saepiolus)

Greenish Blue (Plebejus saepiolus)

R. Bray

The Gossamer Wing Family consists of small butterflies, many brightly colored. They are high to low elevation species. There may be more than 15 species of blues found in the park. Seven are common, and their upper sides are hard to tell apart.
 
Ruddy Copper (Lycaena rubidus)

Ruddy Copper (Lycaena rubidus)

R. Bray

Coppers are another group in the Lycaenidae family. Four species of coppers fly in the park. The male Ruddy Copper flies in July and August in the montane and lower sub-alpine. Other members of the Lycaenidae family in the park include the elfins and the hairstreaks.
 
Nymphalidae (The Brushfoot Family)
 
a photo of a Weidemeyer's Admiral butterfly (Limenitis weidemeyerii)

Weidemeyer's Admiral (Limenitis weidemeyerii)

R. Bray

Brushfoot Family members have four walking legs instead of the usual six. Their other two legs have evolved into brushes used to taste-test host plants and to clean their proboscis. This family is the biggest group in the park, and they exploit a range of plant shapes, sizes, and colors. Look for the Weidemeyer’s Admiral flying in mid-to late summer along the Fern Lake and Wild Basin trails.
 
a photo of a Dotted Checkerspot butterfly (Poladryas arachne)

Dotted Checkerspot (Poladryas arachne)

R. Bray

The Dotted Checkerspot is one of the Crescent and Checkerspot sub-groups of the Nymphalidae family. It flies in open sunny meadows from July through mid-August.
 
a photo of a Mormon Fritillary butterfly on a yellow flower

Mormon Fritillary (Speyeria mormonia)

R. Bray

The Speyeria or Greater Fritillaries are another group in the Nymphalidae family. Most have beautiful silver spots on the undersides of their hind wings. Look for the Mormon Frittillary along the Poudre Trail near Milner Pass.
 
a photo of a Green Comma butterfly (Polygonia faunus)

Green Comma (Polygonia faunus)

R. Bray

Anglewings or Commas are represented in the park by several species. All have scalloped edges to their wings. They over winter as adults, unlike most butterflies that pass the winter in the egg, caterpillar, or chrysalis stage.
 
a photo of a Monarch butterfly (Danaus plexippus)

Monarch (Danaus plexippus)

R. Bray

Monarchs are the most recognized butterfly in the park, but among the least frequently seen. Their host plant, showy milkweed, is not common in the park. Most years, only a few monarchs are seen flying within our boundary.

 
(text by S. Mason)

Did You Know?

a photo of a man measuring a glacier using a theodolite

You can virtually explore the anatomy of glaciers. Watch glaciers ebb and flow over the last 18,000 years. Tour the landscape as ice shapes and molds it. Launch the interactive web pages featuring the Glaciers and Glacier Change in RMNP. More...