60 butterflies were recorded flying in Indiana in August in our iNaturalist sample; 21 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top butterflies in August

Monarch

Eastern Tiger Swallowtail

Silver-spotted Skipper
Hackberry Emperor

Common Buckeye

Black Swallowtail

Spicebush Swallowtail

Zabulon Skipper

Pearl Crescent

Small White

Painted Lady

Eastern Tailed-Blue
All butterflies flying in Indiana in August
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Monarch | Danaus plexippus | Brush-footed Butterflies | 2,023 | Aug (peak) |
| 2 | Eastern Tiger Swallowtail | Papilio glaucus | Swallowtails and Parnassians | 1,465 | Aug (peak) |
| 3 | Silver-spotted Skipper | Epargyreus clarus | Skippers | 669 | Aug (peak) |
| 4 | Hackberry Emperor | Asterocampa celtis | Brush-footed Butterflies | 589 | Aug (peak) |
| 5 | Common Buckeye | Junonia coenia | Brush-footed Butterflies | 546 | Sep (rising) |
| 6 | Black Swallowtail | Papilio polyxenes | Swallowtails and Parnassians | 523 | Aug (peak) |
| 7 | Spicebush Swallowtail | Papilio troilus | Swallowtails and Parnassians | 513 | Jul (past peak) |
| 8 | Zabulon Skipper | Lon zabulon | Skippers | 506 | Aug (peak) |
| 9 | Pearl Crescent | Phyciodes tharos | Brush-footed Butterflies | 387 | Aug (peak) |
| 10 | Small White | Pieris rapae | Whites, Yellows, and Sulphurs | 384 | Sep (rising) |
| 11 | Painted Lady | Vanessa cardui | Brush-footed Butterflies | 351 | Sep (rising) |
| 12 | Eastern Tailed-Blue | Everes comyntas | Gossamer-winged Butterflies | 321 | Aug (peak) |
| 13 | Red-spotted Admiral | Limenitis arthemis | Brush-footed Butterflies | 264 | Aug (peak) |
| 14 | Peck's Skipper | Polites peckius | Skippers | 248 | Sep (rising) |
| 15 | Red Admiral | Vanessa atalanta | Brush-footed Butterflies | 227 | Jun (past peak) |
| 16 | Viceroy | Limenitis archippus | Brush-footed Butterflies | 208 | Sep (rising) |
| 17 | Pipevine Swallowtail | Battus philenor | Swallowtails and Parnassians | 196 | Jul (past peak) |
| 18 | Question Mark | Polygonia interrogationis | Brush-footed Butterflies | 169 | Jul (past peak) |
| 19 | Eastern Comma | Polygonia comma | Brush-footed Butterflies | 159 | Aug (peak) |
| 20 | Variegated Fritillary | Euptoieta claudia | Brush-footed Butterflies | 154 | Sep (rising) |
| 21 | Tawny-edged Skipper | Polites themistocles | Skippers | 141 | Aug (peak) |
| 22 | Great Spangled Fritillary | Argynnis cybele | Brush-footed Butterflies | 138 | Jun (past peak) |
| 23 | Eastern Giant Swallowtail | Heraclides cresphontes | Swallowtails and Parnassians | 137 | Jul (past peak) |
| 24 | Huron Skipper | Atalopedes huron | Skippers | 137 | Sep (rising) |
| 25 | Orange Sulphur | Colias eurytheme | Whites, Yellows, and Sulphurs | 135 | Sep (rising) |
| 26 | Gray Hairstreak | Strymon melinus | Gossamer-winged Butterflies | 127 | Aug (peak) |
| 27 | Fiery Skipper | Hylephila phyleus | Skippers | 122 | Sep (rising) |
| 28 | Northern Pearly-eye | Lethe anthedon | Brush-footed Butterflies | 120 | Aug (peak) |
| 29 | Least Skipper | Ancyloxypha numitor | Skippers | 104 | Aug (peak) |
| 30 | Tawny Emperor | Asterocampa clyton | Brush-footed Butterflies | 98 | Aug (peak) |
| 31 | American Snout | Libytheana carinenta | Brush-footed Butterflies | 77 | Jul (past peak) |
| 32 | Wild Indigo Duskywing | Erynnis baptisiae | Skippers | 60 | Aug (peak) |
| 33 | Cloudless Sulphur | Phoebis sennae | Whites, Yellows, and Sulphurs | 59 | Sep (rising) |
| 34 | Summer Azure | Celastrina neglecta | Gossamer-winged Butterflies | 54 | Jul (past peak) |
| 35 | Silvery Checkerspot | Chlosyne nycteis | Brush-footed Butterflies | 50 | Jul (past peak) |
| 36 | Zebra Swallowtail | Eurytides marcellus | Swallowtails and Parnassians | 49 | Jun (past peak) |
| 37 | Common Checkered-Skipper | Burnsius communis | Skippers | 44 | Sep (rising) |
| 38 | Red-banded Hairstreak | Calycopis cecrops | Gossamer-winged Butterflies | 43 | Aug (peak) |
| 39 | Common Sootywing | Pholisora catullus | Skippers | 38 | Aug (peak) |
| 40 | Delaware Skipper | Anatrytone logan | Skippers | 38 | Aug (peak) |
| 41 | Meadow Fritillary | Boloria bellona | Brush-footed Butterflies | 33 | Sep (rising) |
| 42 | Dun Skipper | Euphyes vestris | Skippers | 31 | Jul (past peak) |
| 43 | Little Yellow | Eurema lisa | Whites, Yellows, and Sulphurs | 30 | Aug (peak) |
| 44 | Harvester | Feniseca tarquinius | Gossamer-winged Butterflies | 27 | Jul (past peak) |
| 45 | Eastern Gemmed-Satyr | Cyllopsis gemma | Brush-footed Butterflies | 21 | Aug (peak) |
| 46 | Common Wood-Nymph | Cercyonis pegala | Brush-footed Butterflies | 20 | Jul (past peak) |
| 47 | American Lady | Vanessa virginiensis | Brush-footed Butterflies | 19 | May (past peak) |
| 48 | American Copper | Lycaena hypophlaeas | Gossamer-winged Butterflies | 19 | Jul (past peak) |
| 49 | Horace's Duskywing | Erynnis horatius | Skippers | 15 | Jul (past peak) |
| 50 | Clouded Sulphur | Colias philodice | Whites, Yellows, and Sulphurs | 15 | Sep (rising) |