60 butterflies were recorded flying in California in June in our iNaturalist sample; 21 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top butterflies in June

Monarch

Gray Buckeye

Western Tiger Swallowtail

Variable Checkerspot

Small White

Anise Swallowtail

California Sister

Pale Swallowtail

Acmon Blue
Mourning Cloak

Fiery Skipper
Mylitta Crescent
All butterflies flying in California in June
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Monarch | Danaus plexippus | Brush-footed Butterflies | 6,993 | Jul (rising) |
| 2 | Gray Buckeye | Junonia grisea | Brush-footed Butterflies | 4,924 | Jun (peak) |
| 3 | Western Tiger Swallowtail | Papilio rutulus | Swallowtails and Parnassians | 3,806 | Jun (peak) |
| 4 | Variable Checkerspot | Euphydryas chalcedona | Brush-footed Butterflies | 3,351 | May (past peak) |
| 5 | Small White | Pieris rapae | Whites, Yellows, and Sulphurs | 3,120 | Jul (rising) |
| 6 | Anise Swallowtail | Papilio zelicaon | Swallowtails and Parnassians | 3,048 | Jun (peak) |
| 7 | California Sister | Adelpha californica | Brush-footed Butterflies | 2,910 | Jun (peak) |
| 8 | Pale Swallowtail | Papilio eurymedon | Swallowtails and Parnassians | 2,899 | Jun (peak) |
| 9 | Acmon Blue | Icaricia acmon | Gossamer-winged Butterflies | 2,784 | Jul (rising) |
| 10 | Mourning Cloak | Nymphalis antiopa | Brush-footed Butterflies | 2,551 | Apr (past peak) |
| 11 | Fiery Skipper | Hylephila phyleus | Skippers | 2,384 | Sep (rising) |
| 12 | Mylitta Crescent | Phyciodes mylitta | Brush-footed Butterflies | 2,360 | Jun (peak) |
| 13 | Lorquin's Admiral | Limenitis lorquini | Brush-footed Butterflies | 2,302 | Jun (peak) |
| 14 | Gray Hairstreak | Strymon melinus | Gossamer-winged Butterflies | 2,115 | Aug (rising) |
| 15 | Echo Azure | Celastrina echo | Gossamer-winged Butterflies | 2,113 | Jun (peak) |
| 16 | Umber Skipper | Lon melane | Skippers | 1,993 | May (past peak) |
| 17 | Marine Blue | Leptotes marina | Gossamer-winged Butterflies | 1,904 | Jul (rising) |
| 18 | Hedgerow Hairstreak | Satyrium saepium | Gossamer-winged Butterflies | 1,617 | Jun (peak) |
| 19 | California Tortoiseshell | Nymphalis californica | Brush-footed Butterflies | 1,602 | May (past peak) |
| 20 | Gulf Fritillary | Dione vanillae | Brush-footed Butterflies | 1,550 | Sep (rising) |
| 21 | Rural Skipper | Ochlodes agricola | Skippers | 1,429 | Jun (peak) |
| 22 | Painted Lady | Vanessa cardui | Brush-footed Butterflies | 1,262 | Apr (past peak) |
| 23 | Checkered White | Pontia protodice | Whites, Yellows, and Sulphurs | 1,251 | Jun (peak) |
| 24 | Bernardino Blue | Euphilotes bernardino | Gossamer-winged Butterflies | 1,104 | Jun (peak) |
| 25 | Red Admiral | Vanessa atalanta | Brush-footed Butterflies | 1,073 | Apr (past peak) |
| 26 | West Coast Lady | Vanessa annabella | Brush-footed Butterflies | 1,041 | Apr (past peak) |
| 27 | American Lady | Vanessa virginiensis | Brush-footed Butterflies | 910 | Jul (rising) |
| 28 | Common Ringlet | Coenonympha california | Brush-footed Butterflies | 890 | Apr (past peak) |
| 29 | Mournful Duskywing | Erynnis tristis | Skippers | 857 | Aug (rising) |
| 30 | Orange Sulphur | Colias eurytheme | Whites, Yellows, and Sulphurs | 833 | Oct (rising) |
| 31 | Boisduval's Blue | Icaricia icarioides | Gossamer-winged Butterflies | 780 | Jun (peak) |
| 32 | Behr's Metalmark | Apodemia virgulti | Metalmark Butterflies | 763 | May (past peak) |
| 33 | Funereal Duskywing | Erynnis funeralis | Skippers | 698 | Mar (past peak) |
| 34 | Northern Checkerspot | Chlosyne palla | Brush-footed Butterflies | 696 | May (past peak) |
| 35 | Western Pygmy-Blue | Brephidium exilis | Gossamer-winged Butterflies | 667 | Oct (rising) |
| 36 | Propertius Duskywing | Erynnis propertius | Skippers | 662 | Apr (past peak) |
| 37 | Common Checkered-Skipper | Burnsius communis | Skippers | 662 | Oct (rising) |
| 38 | Field Crescent | Phyciodes pulchella | Brush-footed Butterflies | 649 | Jun (peak) |
| 39 | Greenish Blue | Icaricia saepiolus | Gossamer-winged Butterflies | 611 | Jul (rising) |
| 40 | Northern White-Skipper | Heliopetes ericetorum | Skippers | 589 | Jun (peak) |
| 41 | Satyr Comma | Polygonia satyrus | Brush-footed Butterflies | 569 | Jun (peak) |
| 42 | Callippe Fritillary | Argynnis callippe | Brush-footed Butterflies | 522 | Jun (peak) |
| 43 | Western Giant Swallowtail | Heraclides rumiko | Swallowtails and Parnassians | 518 | Sep (rising) |
| 44 | Clodius Parnassian | Parnassius clodius | Swallowtails and Parnassians | 490 | Jul (rising) |
| 45 | Brown Elfin | Callophrys augustinus | Gossamer-winged Butterflies | 487 | Apr (past peak) |
| 46 | Pacific Fritillary | Boloria epithore | Brush-footed Butterflies | 479 | Jun (peak) |
| 47 | Coronis Fritillary | Argynnis coronis | Brush-footed Butterflies | 398 | Jun (peak) |
| 48 | Juniper Hairstreak | Callophrys gryneus | Gossamer-winged Butterflies | 392 | Jun (peak) |
| 49 | Common Wood-Nymph | Cercyonis pegala | Brush-footed Butterflies | 325 | Jun (peak) |
| 50 | Edith's Checkerspot | Euphydryas editha | Brush-footed Butterflies | 307 | May (past peak) |