Butterflies Flying in Wyoming in September (57 Species)

57 butterflies were recorded flying in Wyoming in September 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.

Apr May Jun Jul Aug Sep Oct

Top butterflies in September

Painted Lady81 obs.

California Tortoiseshell56 obs.

Green Comma56 obs.

Mormon Fritillary50 obs.

Hoary Comma43 obs.

Variegated Fritillary41 obs.

Clouded Sulphur38 obs.

Monarch36 obs.

Purplish Copper36 obs.

Mourning Cloak34 obs.

Milbert's Tortoiseshell33 obs.

Two-tailed Swallowtail26 obs.

All butterflies flying in Wyoming in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	Painted Lady	Vanessa cardui	Brush-footed Butterflies	81	Jul (past peak)
2	California Tortoiseshell	Nymphalis californica	Brush-footed Butterflies	56	Jul (past peak)
3	Green Comma	Polygonia faunus	Brush-footed Butterflies	56	Aug (past peak)
4	Mormon Fritillary	Argynnis mormonia	Brush-footed Butterflies	50	Jul (past peak)
5	Hoary Comma	Polygonia gracilis	Brush-footed Butterflies	43	Aug (past peak)
6	Variegated Fritillary	Euptoieta claudia	Brush-footed Butterflies	41	Sep (peak)
7	Clouded Sulphur	Colias philodice	Whites, Yellows, and Sulphurs	38	Jul (past peak)
8	Monarch	Danaus plexippus	Brush-footed Butterflies	36	Aug (past peak)
9	Purplish Copper	Tharsalea helloides	Gossamer-winged Butterflies	36	Jul (past peak)
10	Mourning Cloak	Nymphalis antiopa	Brush-footed Butterflies	34	Aug (past peak)
11	Milbert's Tortoiseshell	Aglais milberti	Brush-footed Butterflies	33	Jul (past peak)
12	Two-tailed Swallowtail	Papilio multicaudata	Swallowtails and Parnassians	26	Jul (past peak)
13	Common Checkered-Skipper	Burnsius communis	Skippers	25	Aug (past peak)
14	Rocky Mountain Parnassian	Parnassius smintheus	Swallowtails and Parnassians	20	Jul (past peak)
15	Small White	Pieris rapae	Whites, Yellows, and Sulphurs	18	Jul (past peak)
16	Pine White	Neophasia menapia	Whites, Yellows, and Sulphurs	18	Aug (past peak)
17	American Branded Skipper	Hesperia colorado	Skippers	17	Aug (past peak)
18	Red Admiral	Vanessa atalanta	Brush-footed Butterflies	16	Jun (past peak)
19	Melissa Blue	Plebejus melissa	Gossamer-winged Butterflies	16	Jul (past peak)
20	Satyr Comma	Polygonia satyrus	Brush-footed Butterflies	15	Jun (past peak)
21	Woodland Skipper	Ochlodes sylvanoides	Skippers	15	Aug (past peak)
22	Orange Sulphur	Colias eurytheme	Whites, Yellows, and Sulphurs	14	Aug (past peak)
23	Western White	Pontia occidentalis	Whites, Yellows, and Sulphurs	14	Jul (past peak)
24	Essex Skipper	Thymelicus lineola	Skippers	13	Jul (past peak)
25	Small Wood-Nymph	Cercyonis oetus	Brush-footed Butterflies	11	Jul (past peak)
26	Checkered White	Pontia protodice	Whites, Yellows, and Sulphurs	9	Jul (past peak)
27	American Lady	Vanessa virginiensis	Brush-footed Butterflies	8	Sep (peak)
28	Field Crescent	Phyciodes pulchella	Brush-footed Butterflies	8	Jul (past peak)
29	Blue Copper	Tharsalea heteronea	Gossamer-winged Butterflies	8	Jul (past peak)
30	Juba Skipper	Hesperia juba	Skippers	7	Jun (past peak)
31	Gray Hairstreak	Strymon melinus	Gossamer-winged Butterflies	6	Jul (past peak)
32	West Coast Lady	Vanessa annabella	Brush-footed Butterflies	5	Aug (past peak)
33	Common Wood-Nymph	Cercyonis pegala	Brush-footed Butterflies	4	Jul (past peak)
34	Weidemeyer's Admiral	Limenitis weidemeyerii	Brush-footed Butterflies	4	Jul (past peak)
35	Callippe Fritillary	Argynnis callippe	Brush-footed Butterflies	4	Jul (past peak)
36	Coronis Fritillary	Argynnis coronis	Brush-footed Butterflies	4	Jul (past peak)
37	Western Tiger Swallowtail	Papilio rutulus	Swallowtails and Parnassians	2	Jun (past peak)
38	Anise Swallowtail	Papilio zelicaon	Swallowtails and Parnassians	2	Jul (past peak)
39	Queen	Danaus gilippus	Brush-footed Butterflies	2	Sep (peak)
40	Reakirt's Blue	Echinargus isola	Gossamer-winged Butterflies	2	Jul (past peak)
41	Aphrodite Fritillary	Argynnis aphrodite	Brush-footed Butterflies	2	Jul (past peak)
42	Common Buckeye	Junonia coenia	Brush-footed Butterflies	1	Jul (past peak)
43	Cloudless Sulphur	Phoebis sennae	Whites, Yellows, and Sulphurs	1	Sep (peak)
44	Dainty Sulphur	Nathalis iole	Whites, Yellows, and Sulphurs	1	Oct (rising)
45	Pearl Crescent	Phyciodes tharos	Brush-footed Butterflies	1	Jul (past peak)
46	Question Mark	Polygonia interrogationis	Brush-footed Butterflies	1	Aug (past peak)
47	Gray Comma	Polygonia progne	Brush-footed Butterflies	1	May (past peak)
48	Marine Blue	Leptotes marina	Gossamer-winged Butterflies	1	Jul (past peak)
49	Mylitta Crescent	Phyciodes mylitta	Brush-footed Butterflies	1	Jul (past peak)
50	Margined White	Pieris marginalis	Whites, Yellows, and Sulphurs	1	Jul (past peak)