60 butterflies were recorded flying in Tennessee in October in our iNaturalist sample; 6 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top butterflies in October

Gulf Fritillary

Monarch

Common Buckeye
Huron Skipper

Cloudless Sulphur

Fiery Skipper

Variegated Fritillary

Clouded Skipper

Long-tailed Skipper

Pipevine Swallowtail

Painted Lady

Common Checkered-Skipper
All butterflies flying in Tennessee in October
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Gulf Fritillary | Dione vanillae | Brush-footed Butterflies | 1,134 | Sep (past peak) |
| 2 | Monarch | Danaus plexippus | Brush-footed Butterflies | 952 | Sep (past peak) |
| 3 | Common Buckeye | Junonia coenia | Brush-footed Butterflies | 669 | Sep (past peak) |
| 4 | Huron Skipper | Atalopedes huron | Skippers | 413 | Aug (past peak) |
| 5 | Cloudless Sulphur | Phoebis sennae | Whites, Yellows, and Sulphurs | 407 | Aug (past peak) |
| 6 | Fiery Skipper | Hylephila phyleus | Skippers | 370 | Oct (peak) |
| 7 | Variegated Fritillary | Euptoieta claudia | Brush-footed Butterflies | 304 | Sep (past peak) |
| 8 | Clouded Skipper | Lerema accius | Skippers | 268 | Sep (past peak) |
| 9 | Long-tailed Skipper | Urbanus proteus | Skippers | 265 | Oct (peak) |
| 10 | Pipevine Swallowtail | Battus philenor | Swallowtails and Parnassians | 253 | Jul (past peak) |
| 11 | Painted Lady | Vanessa cardui | Brush-footed Butterflies | 227 | Oct (peak) |
| 12 | Common Checkered-Skipper | Burnsius communis | Skippers | 198 | Oct (peak) |
| 13 | Pearl Crescent | Phyciodes tharos | Brush-footed Butterflies | 165 | Sep (past peak) |
| 14 | Question Mark | Polygonia interrogationis | Brush-footed Butterflies | 153 | Aug (past peak) |
| 15 | Ocola Skipper | Panoquina ocola | Skippers | 137 | Oct (peak) |
| 16 | Sleepy Orange | Eurema nicippe | Whites, Yellows, and Sulphurs | 108 | Aug (past peak) |
| 17 | Eastern Tiger Swallowtail | Papilio glaucus | Swallowtails and Parnassians | 103 | Aug (past peak) |
| 18 | Eastern Tailed-Blue | Everes comyntas | Gossamer-winged Butterflies | 102 | Sep (past peak) |
| 19 | Red-banded Hairstreak | Calycopis cecrops | Gossamer-winged Butterflies | 88 | Sep (past peak) |
| 20 | Viceroy | Limenitis archippus | Brush-footed Butterflies | 85 | Sep (past peak) |
| 21 | Eastern Comma | Polygonia comma | Brush-footed Butterflies | 82 | Mar (past peak) |
| 22 | Small White | Pieris rapae | Whites, Yellows, and Sulphurs | 78 | Jun (past peak) |
| 23 | Orange Sulphur | Colias eurytheme | Whites, Yellows, and Sulphurs | 78 | Jul (past peak) |
| 24 | Great Spangled Fritillary | Argynnis cybele | Brush-footed Butterflies | 70 | May (past peak) |
| 25 | Carolina Satyr | Hermeuptychia sosybius | Brush-footed Butterflies | 65 | Apr (past peak) |
| 26 | Red Admiral | Vanessa atalanta | Brush-footed Butterflies | 49 | Jul (past peak) |
| 27 | Silver-spotted Skipper | Epargyreus clarus | Skippers | 48 | Jul (past peak) |
| 28 | Dainty Sulphur | Nathalis iole | Whites, Yellows, and Sulphurs | 38 | Oct (peak) |
| 29 | Little Yellow | Eurema lisa | Whites, Yellows, and Sulphurs | 38 | Sep (past peak) |
| 30 | American Lady | Vanessa virginiensis | Brush-footed Butterflies | 37 | Jun (past peak) |
| 31 | Hackberry Emperor | Asterocampa celtis | Brush-footed Butterflies | 33 | Aug (past peak) |
| 32 | Gray Hairstreak | Strymon melinus | Gossamer-winged Butterflies | 30 | Aug (past peak) |
| 33 | Spicebush Swallowtail | Papilio troilus | Swallowtails and Parnassians | 30 | Jul (past peak) |
| 34 | Clouded Sulphur | Colias philodice | Whites, Yellows, and Sulphurs | 25 | Jul (past peak) |
| 35 | Eastern Gemmed-Satyr | Cyllopsis gemma | Brush-footed Butterflies | 24 | Apr (past peak) |
| 36 | Checkered White | Pontia protodice | Whites, Yellows, and Sulphurs | 17 | Aug (past peak) |
| 37 | American Snout | Libytheana carinenta | Brush-footed Butterflies | 16 | Jul (past peak) |
| 38 | Southern Dogface | Zerene cesonia | Whites, Yellows, and Sulphurs | 12 | Jun (past peak) |
| 39 | Eastern Giant Swallowtail | Heraclides cresphontes | Swallowtails and Parnassians | 11 | Aug (past peak) |
| 40 | Northern Pearly-eye | Lethe anthedon | Brush-footed Butterflies | 11 | Aug (past peak) |
| 41 | Tawny Emperor | Asterocampa clyton | Brush-footed Butterflies | 10 | Aug (past peak) |
| 42 | Goatweed Leafwing | Anaea andria | Brush-footed Butterflies | 10 | Apr (past peak) |
| 43 | Harvester | Feniseca tarquinius | Gossamer-winged Butterflies | 10 | Apr (past peak) |
| 44 | Mourning Cloak | Nymphalis antiopa | Brush-footed Butterflies | 8 | Mar (past peak) |
| 45 | Wild Indigo Duskywing | Erynnis baptisiae | Skippers | 7 | Aug (past peak) |
| 46 | Least Skipper | Ancyloxypha numitor | Skippers | 7 | Aug (past peak) |
| 47 | Red-spotted Admiral | Limenitis arthemis | Brush-footed Butterflies | 7 | Aug (past peak) |
| 48 | White M Hairstreak | Parrhasius m-album | Gossamer-winged Butterflies | 7 | Mar (past peak) |
| 49 | Southern Pearly-eye | Lethe portlandia | Brush-footed Butterflies | 6 | Aug (past peak) |
| 50 | Phaon Crescent | Phyciodes phaon | Brush-footed Butterflies | 4 | Sep (past peak) |