60 butterflies were recorded flying in Arkansas in September in our iNaturalist sample; 8 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top butterflies in September

Monarch
Hackberry Emperor

Common Buckeye
Huron Skipper

Painted Lady

Pearl Crescent

Fiery Skipper

Spicebush Swallowtail

Clouded Skipper

Pipevine Swallowtail

Eastern Tiger Swallowtail

Eastern Tailed-Blue
All butterflies flying in Arkansas in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Monarch | Danaus plexippus | Brush-footed Butterflies | 1,169 | Sep (peak) |
| 2 | Hackberry Emperor | Asterocampa celtis | Brush-footed Butterflies | 516 | Sep (peak) |
| 3 | Common Buckeye | Junonia coenia | Brush-footed Butterflies | 443 | Aug (past peak) |
| 4 | Huron Skipper | Atalopedes huron | Skippers | 323 | Oct (rising) |
| 5 | Painted Lady | Vanessa cardui | Brush-footed Butterflies | 310 | Sep (peak) |
| 6 | Pearl Crescent | Phyciodes tharos | Brush-footed Butterflies | 304 | Jun (past peak) |
| 7 | Fiery Skipper | Hylephila phyleus | Skippers | 295 | Aug (past peak) |
| 8 | Spicebush Swallowtail | Papilio troilus | Swallowtails and Parnassians | 286 | Aug (past peak) |
| 9 | Clouded Skipper | Lerema accius | Skippers | 252 | Oct (rising) |
| 10 | Pipevine Swallowtail | Battus philenor | Swallowtails and Parnassians | 249 | Aug (past peak) |
| 11 | Eastern Tiger Swallowtail | Papilio glaucus | Swallowtails and Parnassians | 245 | Aug (past peak) |
| 12 | Eastern Tailed-Blue | Everes comyntas | Gossamer-winged Butterflies | 223 | Jun (past peak) |
| 13 | Gulf Fritillary | Dione vanillae | Brush-footed Butterflies | 222 | Oct (rising) |
| 14 | Red-banded Hairstreak | Calycopis cecrops | Gossamer-winged Butterflies | 212 | Sep (peak) |
| 15 | Great Spangled Fritillary | Argynnis cybele | Brush-footed Butterflies | 203 | May (past peak) |
| 16 | Variegated Fritillary | Euptoieta claudia | Brush-footed Butterflies | 202 | Aug (past peak) |
| 17 | Viceroy | Limenitis archippus | Brush-footed Butterflies | 200 | Sep (peak) |
| 18 | Cloudless Sulphur | Phoebis sennae | Whites, Yellows, and Sulphurs | 195 | Aug (past peak) |
| 19 | Question Mark | Polygonia interrogationis | Brush-footed Butterflies | 177 | May (past peak) |
| 20 | Silver-spotted Skipper | Epargyreus clarus | Skippers | 142 | Aug (past peak) |
| 21 | Gray Hairstreak | Strymon melinus | Gossamer-winged Butterflies | 115 | Jun (past peak) |
| 22 | Sleepy Orange | Eurema nicippe | Whites, Yellows, and Sulphurs | 114 | Aug (past peak) |
| 23 | Little Yellow | Eurema lisa | Whites, Yellows, and Sulphurs | 112 | Sep (peak) |
| 24 | Dainty Sulphur | Nathalis iole | Whites, Yellows, and Sulphurs | 111 | Oct (rising) |
| 25 | Eastern Giant Swallowtail | Heraclides cresphontes | Swallowtails and Parnassians | 100 | Aug (past peak) |
| 26 | Carolina Satyr | Hermeuptychia sosybius | Brush-footed Butterflies | 89 | Apr (past peak) |
| 27 | American Lady | Vanessa virginiensis | Brush-footed Butterflies | 87 | Jun (past peak) |
| 28 | Tawny Emperor | Asterocampa clyton | Brush-footed Butterflies | 78 | Aug (past peak) |
| 29 | Common Wood-Nymph | Cercyonis pegala | Brush-footed Butterflies | 67 | Jun (past peak) |
| 30 | Phaon Crescent | Phyciodes phaon | Brush-footed Butterflies | 67 | Oct (rising) |
| 31 | Red-spotted Admiral | Limenitis arthemis | Brush-footed Butterflies | 66 | Jul (past peak) |
| 32 | Northern Pearly-eye | Lethe anthedon | Brush-footed Butterflies | 64 | Aug (past peak) |
| 33 | Red Admiral | Vanessa atalanta | Brush-footed Butterflies | 62 | Jul (past peak) |
| 34 | Least Skipper | Ancyloxypha numitor | Skippers | 62 | Aug (past peak) |
| 35 | Eastern Gemmed-Satyr | Cyllopsis gemma | Brush-footed Butterflies | 59 | Apr (past peak) |
| 36 | Common Checkered-Skipper | Burnsius communis | Skippers | 55 | Oct (rising) |
| 37 | Eastern Comma | Polygonia comma | Brush-footed Butterflies | 51 | Mar (past peak) |
| 38 | Goatweed Leafwing | Anaea andria | Brush-footed Butterflies | 48 | Apr (past peak) |
| 39 | Southern Broken-Dash | Polites otho | Skippers | 47 | Sep (peak) |
| 40 | Zabulon Skipper | Lon zabulon | Skippers | 42 | Aug (past peak) |
| 41 | Ocola Skipper | Panoquina ocola | Skippers | 37 | Oct (rising) |
| 42 | Dun Skipper | Euphyes vestris | Skippers | 36 | Aug (past peak) |
| 43 | Checkered White | Pontia protodice | Whites, Yellows, and Sulphurs | 34 | Jul (past peak) |
| 44 | Orange Sulphur | Colias eurytheme | Whites, Yellows, and Sulphurs | 32 | Oct (rising) |
| 45 | Small White | Pieris rapae | Whites, Yellows, and Sulphurs | 31 | Jul (past peak) |
| 46 | Southern Dogface | Zerene cesonia | Whites, Yellows, and Sulphurs | 29 | Sep (peak) |
| 47 | Horace's Duskywing | Erynnis horatius | Skippers | 28 | Jun (past peak) |
| 48 | Black Swallowtail | Papilio polyxenes | Swallowtails and Parnassians | 27 | Aug (past peak) |
| 49 | Silvery Checkerspot | Chlosyne nycteis | Brush-footed Butterflies | 27 | Jul (past peak) |
| 50 | Diana Fritillary | Argynnis diana | Brush-footed Butterflies | 27 | Jun (past peak) |