60 butterflies were recorded flying in Missouri in April 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 April

Zebra Swallowtail

Red Admiral

Eastern Tiger Swallowtail

Eastern Tailed-Blue

Pearl Crescent

Pipevine Swallowtail

Monarch

Juvenal's Duskywing

Spicebush Swallowtail

Falcate Orangetip

Goatweed Leafwing

Silver-spotted Skipper
All butterflies flying in Missouri in April
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Zebra Swallowtail | Eurytides marcellus | Swallowtails and Parnassians | 375 | Jun (rising) |
| 2 | Red Admiral | Vanessa atalanta | Brush-footed Butterflies | 349 | Apr (peak) |
| 3 | Eastern Tiger Swallowtail | Papilio glaucus | Swallowtails and Parnassians | 332 | Aug (rising) |
| 4 | Eastern Tailed-Blue | Everes comyntas | Gossamer-winged Butterflies | 286 | Sep (rising) |
| 5 | Pearl Crescent | Phyciodes tharos | Brush-footed Butterflies | 268 | Sep (rising) |
| 6 | Pipevine Swallowtail | Battus philenor | Swallowtails and Parnassians | 218 | Jul (rising) |
| 7 | Monarch | Danaus plexippus | Brush-footed Butterflies | 137 | Sep (rising) |
| 8 | Juvenal's Duskywing | Erynnis juvenalis | Skippers | 126 | Apr (peak) |
| 9 | Spicebush Swallowtail | Papilio troilus | Swallowtails and Parnassians | 119 | Aug (rising) |
| 10 | Falcate Orangetip | Anthocharis midea | Whites, Yellows, and Sulphurs | 112 | Apr (peak) |
| 11 | Goatweed Leafwing | Anaea andria | Brush-footed Butterflies | 110 | Apr (peak) |
| 12 | Silver-spotted Skipper | Epargyreus clarus | Skippers | 108 | Sep (rising) |
| 13 | American Lady | Vanessa virginiensis | Brush-footed Butterflies | 93 | May (rising) |
| 14 | Eastern Comma | Polygonia comma | Brush-footed Butterflies | 91 | Sep (rising) |
| 15 | Question Mark | Polygonia interrogationis | Brush-footed Butterflies | 79 | Aug (rising) |
| 16 | Red-banded Hairstreak | Calycopis cecrops | Gossamer-winged Butterflies | 78 | Aug (rising) |
| 17 | Common Buckeye | Junonia coenia | Brush-footed Butterflies | 68 | Sep (rising) |
| 18 | Black Swallowtail | Papilio polyxenes | Swallowtails and Parnassians | 66 | Sep (rising) |
| 19 | Juniper Hairstreak | Callophrys gryneus | Gossamer-winged Butterflies | 66 | Apr (peak) |
| 20 | Henry's Elfin | Callophrys henrici | Gossamer-winged Butterflies | 55 | Apr (peak) |
| 21 | Zabulon Skipper | Lon zabulon | Skippers | 48 | Aug (rising) |
| 22 | Gray Hairstreak | Strymon melinus | Gossamer-winged Butterflies | 44 | Sep (rising) |
| 23 | Small White | Pieris rapae | Whites, Yellows, and Sulphurs | 41 | Sep (rising) |
| 24 | Spring Azure | Celastrina ladon | Gossamer-winged Butterflies | 41 | Mar (past peak) |
| 25 | Eastern Gemmed-Satyr | Cyllopsis gemma | Brush-footed Butterflies | 38 | Sep (rising) |
| 26 | Mourning Cloak | Nymphalis antiopa | Brush-footed Butterflies | 37 | Mar (past peak) |
| 27 | Painted Lady | Vanessa cardui | Brush-footed Butterflies | 33 | Sep (rising) |
| 28 | Orange Sulphur | Colias eurytheme | Whites, Yellows, and Sulphurs | 31 | Oct (rising) |
| 29 | Sleepy Duskywing | Erynnis brizo | Skippers | 23 | Apr (peak) |
| 30 | Variegated Fritillary | Euptoieta claudia | Brush-footed Butterflies | 19 | Sep (rising) |
| 31 | Gorgone Checkerspot | Chlosyne gorgone | Brush-footed Butterflies | 19 | May (rising) |
| 32 | Red-spotted Admiral | Limenitis arthemis | Brush-footed Butterflies | 17 | Aug (rising) |
| 33 | Great Spangled Fritillary | Argynnis cybele | Brush-footed Butterflies | 17 | Jun (rising) |
| 34 | Gray Comma | Polygonia progne | Brush-footed Butterflies | 15 | Mar (past peak) |
| 35 | Checkered White | Pontia protodice | Whites, Yellows, and Sulphurs | 13 | Jul (rising) |
| 36 | Common Checkered-Skipper | Burnsius communis | Skippers | 13 | Oct (rising) |
| 37 | Common Sootywing | Pholisora catullus | Skippers | 12 | Jul (rising) |
| 38 | Dainty Sulphur | Nathalis iole | Whites, Yellows, and Sulphurs | 10 | Sep (rising) |
| 39 | Viceroy | Limenitis archippus | Brush-footed Butterflies | 8 | Sep (rising) |
| 40 | Harvester | Feniseca tarquinius | Gossamer-winged Butterflies | 8 | Aug (rising) |
| 41 | Clouded Sulphur | Colias philodice | Whites, Yellows, and Sulphurs | 7 | Sep (rising) |
| 42 | Horace's Duskywing | Erynnis horatius | Skippers | 6 | Jul (rising) |
| 43 | American Snout | Libytheana carinenta | Brush-footed Butterflies | 6 | Jul (rising) |
| 44 | Baltimore Checkerspot | Euphydryas phaeton | Brush-footed Butterflies | 6 | May (rising) |
| 45 | Eastern Giant Swallowtail | Heraclides cresphontes | Swallowtails and Parnassians | 6 | Aug (rising) |
| 46 | Wild Indigo Duskywing | Erynnis baptisiae | Skippers | 5 | Sep (rising) |
| 47 | Eastern Pine Elfin | Callophrys niphon | Gossamer-winged Butterflies | 5 | Apr (peak) |
| 48 | Hoary Edge | Cecropterus lyciades | Skippers | 5 | Aug (rising) |
| 49 | Little Yellow | Eurema lisa | Whites, Yellows, and Sulphurs | 4 | Aug (rising) |
| 50 | Silvery Checkerspot | Chlosyne nycteis | Brush-footed Butterflies | 4 | Jul (rising) |