60 butterflies were recorded flying in Kentucky in May in our iNaturalist sample; 4 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top butterflies in May

Eastern Tiger Swallowtail

Great Spangled Fritillary

Silvery Checkerspot

Little Wood Satyr

Zebra Swallowtail

Spicebush Swallowtail

Zabulon Skipper
Hackberry Emperor

Silver-spotted Skipper

Pearl Crescent

Monarch
Northern Pearly-eye
All butterflies flying in Kentucky in May
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Eastern Tiger Swallowtail | Papilio glaucus | Swallowtails and Parnassians | 374 | Aug (rising) |
| 2 | Great Spangled Fritillary | Argynnis cybele | Brush-footed Butterflies | 363 | Jun (rising) |
| 3 | Silvery Checkerspot | Chlosyne nycteis | Brush-footed Butterflies | 288 | Jul (rising) |
| 4 | Little Wood Satyr | Megisto cymela | Brush-footed Butterflies | 225 | May (peak) |
| 5 | Zebra Swallowtail | Eurytides marcellus | Swallowtails and Parnassians | 218 | Apr (past peak) |
| 6 | Spicebush Swallowtail | Papilio troilus | Swallowtails and Parnassians | 180 | Jul (rising) |
| 7 | Zabulon Skipper | Lon zabulon | Skippers | 173 | Aug (rising) |
| 8 | Hackberry Emperor | Asterocampa celtis | Brush-footed Butterflies | 151 | Aug (rising) |
| 9 | Silver-spotted Skipper | Epargyreus clarus | Skippers | 146 | Jul (rising) |
| 10 | Pearl Crescent | Phyciodes tharos | Brush-footed Butterflies | 142 | Sep (rising) |
| 11 | Monarch | Danaus plexippus | Brush-footed Butterflies | 131 | Aug (rising) |
| 12 | Northern Pearly-eye | Lethe anthedon | Brush-footed Butterflies | 128 | Aug (rising) |
| 13 | Eastern Tailed-Blue | Everes comyntas | Gossamer-winged Butterflies | 126 | Jul (rising) |
| 14 | Pipevine Swallowtail | Battus philenor | Swallowtails and Parnassians | 116 | Jul (rising) |
| 15 | Red Admiral | Vanessa atalanta | Brush-footed Butterflies | 115 | Jul (rising) |
| 16 | Small White | Pieris rapae | Whites, Yellows, and Sulphurs | 97 | Jul (rising) |
| 17 | Carolina Satyr | Hermeuptychia sosybius | Brush-footed Butterflies | 97 | Aug (rising) |
| 18 | Question Mark | Polygonia interrogationis | Brush-footed Butterflies | 71 | Aug (rising) |
| 19 | Summer Azure | Celastrina neglecta | Gossamer-winged Butterflies | 70 | Jul (rising) |
| 20 | Red-banded Hairstreak | Calycopis cecrops | Gossamer-winged Butterflies | 63 | Sep (rising) |
| 21 | Eastern Comma | Polygonia comma | Brush-footed Butterflies | 53 | Mar (past peak) |
| 22 | American Lady | Vanessa virginiensis | Brush-footed Butterflies | 50 | May (peak) |
| 23 | Huron Skipper | Atalopedes huron | Skippers | 45 | Sep (rising) |
| 24 | Orange Sulphur | Colias eurytheme | Whites, Yellows, and Sulphurs | 41 | Jul (rising) |
| 25 | Little Glassywing | Vernia verna | Skippers | 41 | Jun (rising) |
| 26 | Mourning Cloak | Nymphalis antiopa | Brush-footed Butterflies | 36 | Mar (past peak) |
| 27 | Northern Cloudywing | Cecropterus pylades | Skippers | 34 | May (peak) |
| 28 | Meadow Fritillary | Boloria bellona | Brush-footed Butterflies | 33 | Jul (rising) |
| 29 | Least Skipper | Ancyloxypha numitor | Skippers | 28 | Jul (rising) |
| 30 | Red-spotted Admiral | Limenitis arthemis | Brush-footed Butterflies | 25 | Aug (rising) |
| 31 | Eastern Giant Swallowtail | Heraclides cresphontes | Swallowtails and Parnassians | 25 | Jul (rising) |
| 32 | Eastern Gemmed-Satyr | Cyllopsis gemma | Brush-footed Butterflies | 24 | Apr (past peak) |
| 33 | Viceroy | Limenitis archippus | Brush-footed Butterflies | 22 | Sep (rising) |
| 34 | Variegated Fritillary | Euptoieta claudia | Brush-footed Butterflies | 21 | Sep (rising) |
| 35 | Peck's Skipper | Polites peckius | Skippers | 20 | Jul (rising) |
| 36 | Hoary Edge | Cecropterus lyciades | Skippers | 20 | May (peak) |
| 37 | Clouded Sulphur | Colias philodice | Whites, Yellows, and Sulphurs | 19 | Jul (rising) |
| 38 | Juniper Hairstreak | Callophrys gryneus | Gossamer-winged Butterflies | 19 | Apr (past peak) |
| 39 | Common Buckeye | Junonia coenia | Brush-footed Butterflies | 18 | Sep (rising) |
| 40 | Banded Hairstreak | Satyrium calanus | Gossamer-winged Butterflies | 17 | Jun (rising) |
| 41 | Checkered White | Pontia protodice | Whites, Yellows, and Sulphurs | 16 | Aug (rising) |
| 42 | Juvenal's Duskywing | Erynnis juvenalis | Skippers | 14 | Apr (past peak) |
| 43 | American Snout | Libytheana carinenta | Brush-footed Butterflies | 13 | Jul (rising) |
| 44 | Gray Hairstreak | Strymon melinus | Gossamer-winged Butterflies | 12 | Sep (rising) |
| 45 | Tawny-edged Skipper | Polites themistocles | Skippers | 12 | Sep (rising) |
| 46 | Dun Skipper | Euphyes vestris | Skippers | 12 | Aug (rising) |
| 47 | Tawny Emperor | Asterocampa clyton | Brush-footed Butterflies | 11 | Aug (rising) |
| 48 | Painted Lady | Vanessa cardui | Brush-footed Butterflies | 10 | Sep (rising) |
| 49 | Henry's Elfin | Callophrys henrici | Gossamer-winged Butterflies | 10 | Apr (past peak) |
| 50 | Common Sootywing | Pholisora catullus | Skippers | 6 | Aug (rising) |