41 butterflies were recorded flying in Missouri in March in our iNaturalist sample; 3 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top butterflies in March

Eastern Comma

Zebra Swallowtail
Mourning Cloak

Red Admiral

Spring Azure

Eastern Tiger Swallowtail

Gray Comma

Goatweed Leafwing

Juvenal's Duskywing

Falcate Orangetip

Small White

Henry's Elfin
All butterflies flying in Missouri in March
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Eastern Comma | Polygonia comma | Brush-footed Butterflies | 106 | Sep (rising) |
| 2 | Zebra Swallowtail | Eurytides marcellus | Swallowtails and Parnassians | 105 | Jun (rising) |
| 3 | Mourning Cloak | Nymphalis antiopa | Brush-footed Butterflies | 86 | Mar (peak) |
| 4 | Red Admiral | Vanessa atalanta | Brush-footed Butterflies | 80 | Apr (rising) |
| 5 | Spring Azure | Celastrina ladon | Gossamer-winged Butterflies | 75 | Mar (peak) |
| 6 | Eastern Tiger Swallowtail | Papilio glaucus | Swallowtails and Parnassians | 59 | Aug (rising) |
| 7 | Gray Comma | Polygonia progne | Brush-footed Butterflies | 44 | Mar (peak) |
| 8 | Goatweed Leafwing | Anaea andria | Brush-footed Butterflies | 38 | Apr (rising) |
| 9 | Juvenal's Duskywing | Erynnis juvenalis | Skippers | 36 | Apr (rising) |
| 10 | Falcate Orangetip | Anthocharis midea | Whites, Yellows, and Sulphurs | 35 | Apr (rising) |
| 11 | Small White | Pieris rapae | Whites, Yellows, and Sulphurs | 25 | Sep (rising) |
| 12 | Henry's Elfin | Callophrys henrici | Gossamer-winged Butterflies | 23 | Apr (rising) |
| 13 | Juniper Hairstreak | Callophrys gryneus | Gossamer-winged Butterflies | 21 | Apr (rising) |
| 14 | Question Mark | Polygonia interrogationis | Brush-footed Butterflies | 20 | Aug (rising) |
| 15 | Pipevine Swallowtail | Battus philenor | Swallowtails and Parnassians | 16 | Jul (rising) |
| 16 | Eastern Tailed-Blue | Everes comyntas | Gossamer-winged Butterflies | 16 | Sep (rising) |
| 17 | Black Swallowtail | Papilio polyxenes | Swallowtails and Parnassians | 15 | Sep (rising) |
| 18 | Pearl Crescent | Phyciodes tharos | Brush-footed Butterflies | 11 | Sep (rising) |
| 19 | Orange Sulphur | Colias eurytheme | Whites, Yellows, and Sulphurs | 11 | Oct (rising) |
| 20 | Sleepy Duskywing | Erynnis brizo | Skippers | 10 | Apr (rising) |
| 21 | Painted Lady | Vanessa cardui | Brush-footed Butterflies | 8 | Sep (rising) |
| 22 | Gray Hairstreak | Strymon melinus | Gossamer-winged Butterflies | 8 | Sep (rising) |
| 23 | Spicebush Swallowtail | Papilio troilus | Swallowtails and Parnassians | 8 | Aug (rising) |
| 24 | Checkered White | Pontia protodice | Whites, Yellows, and Sulphurs | 6 | Jul (rising) |
| 25 | White M Hairstreak | Parrhasius m-album | Gossamer-winged Butterflies | 5 | Sep (rising) |
| 26 | Eastern Gemmed-Satyr | Cyllopsis gemma | Brush-footed Butterflies | 5 | Sep (rising) |
| 27 | American Lady | Vanessa virginiensis | Brush-footed Butterflies | 3 | May (rising) |
| 28 | Monarch | Danaus plexippus | Brush-footed Butterflies | 3 | Sep (rising) |
| 29 | Silver-spotted Skipper | Epargyreus clarus | Skippers | 3 | Sep (rising) |
| 30 | Red-banded Hairstreak | Calycopis cecrops | Gossamer-winged Butterflies | 3 | Aug (rising) |
| 31 | Common Buckeye | Junonia coenia | Brush-footed Butterflies | 2 | Sep (rising) |
| 32 | Horace's Duskywing | Erynnis horatius | Skippers | 2 | Jul (rising) |
| 33 | Red-spotted Admiral | Limenitis arthemis | Brush-footed Butterflies | 2 | Aug (rising) |
| 34 | Variegated Fritillary | Euptoieta claudia | Brush-footed Butterflies | 2 | Sep (rising) |
| 35 | Dainty Sulphur | Nathalis iole | Whites, Yellows, and Sulphurs | 1 | Sep (rising) |
| 36 | Clouded Sulphur | Colias philodice | Whites, Yellows, and Sulphurs | 1 | Sep (rising) |
| 37 | Silvery Checkerspot | Chlosyne nycteis | Brush-footed Butterflies | 1 | Jul (rising) |
| 38 | Hackberry Emperor | Asterocampa celtis | Brush-footed Butterflies | 1 | Aug (rising) |
| 39 | Summer Azure | Celastrina neglecta | Gossamer-winged Butterflies | 1 | Jun (rising) |
| 40 | Little Glassywing | Vernia verna | Skippers | 1 | Aug (rising) |
| 41 | Great Spangled Fritillary | Argynnis cybele | Brush-footed Butterflies | 1 | Jun (rising) |