Butterflies Flying in Utah in September (60 Species)

60 butterflies were recorded flying in Utah in September 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.

Mar Apr May Jun Jul Aug Sep Oct Nov

Top butterflies in September

Monarch318 obs.

Western Pygmy-Blue171 obs.

Arizona Sister165 obs.

Small White117 obs.

California Tortoiseshell88 obs.

Woodland Skipper88 obs.

Field Crescent77 obs.

Painted Lady66 obs.

Common Checkered-Skipper60 obs.

Two-tailed Swallowtail55 obs.

Mylitta Crescent53 obs.

Gray Hairstreak51 obs.

All butterflies flying in Utah in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	Monarch	Danaus plexippus	Brush-footed Butterflies	318	Aug (past peak)
2	Western Pygmy-Blue	Brephidium exilis	Gossamer-winged Butterflies	171	Oct (rising)
3	Arizona Sister	Adelpha eulalia	Brush-footed Butterflies	165	Sep (peak)
4	Small White	Pieris rapae	Whites, Yellows, and Sulphurs	117	Jun (past peak)
5	California Tortoiseshell	Nymphalis californica	Brush-footed Butterflies	88	Jul (past peak)
6	Woodland Skipper	Ochlodes sylvanoides	Skippers	88	Aug (past peak)
7	Field Crescent	Phyciodes pulchella	Brush-footed Butterflies	77	May (past peak)
8	Painted Lady	Vanessa cardui	Brush-footed Butterflies	66	Apr (past peak)
9	Common Checkered-Skipper	Burnsius communis	Skippers	60	Jul (past peak)
10	Two-tailed Swallowtail	Papilio multicaudata	Swallowtails and Parnassians	55	Jun (past peak)
11	Mylitta Crescent	Phyciodes mylitta	Brush-footed Butterflies	53	Jun (past peak)
12	Gray Hairstreak	Strymon melinus	Gossamer-winged Butterflies	51	Jul (past peak)
13	Hoary Comma	Polygonia gracilis	Brush-footed Butterflies	48	Sep (peak)
14	Clouded Sulphur	Colias philodice	Whites, Yellows, and Sulphurs	47	Sep (peak)
15	Purplish Copper	Tharsalea helloides	Gossamer-winged Butterflies	45	Jul (past peak)
16	Sandhill Skipper	Polites sabuleti	Skippers	42	Aug (past peak)
17	Juba Skipper	Hesperia juba	Skippers	35	May (past peak)
18	Orange Sulphur	Colias eurytheme	Whites, Yellows, and Sulphurs	31	Oct (rising)
19	Weidemeyer's Admiral	Limenitis weidemeyerii	Brush-footed Butterflies	31	Jul (past peak)
20	Melissa Blue	Plebejus melissa	Gossamer-winged Butterflies	29	Jun (past peak)
21	Checkered White	Pontia protodice	Whites, Yellows, and Sulphurs	25	Jun (past peak)
22	Mourning Cloak	Nymphalis antiopa	Brush-footed Butterflies	24	Apr (past peak)
23	American Branded Skipper	Hesperia colorado	Skippers	21	Aug (past peak)
24	Blue Copper	Tharsalea heteronea	Gossamer-winged Butterflies	20	Jul (past peak)
25	Fiery Skipper	Hylephila phyleus	Skippers	19	Sep (peak)
26	Milbert's Tortoiseshell	Aglais milberti	Brush-footed Butterflies	17	Jul (past peak)
27	Coronis Fritillary	Argynnis coronis	Brush-footed Butterflies	17	Sep (peak)
28	West Coast Lady	Vanessa annabella	Brush-footed Butterflies	16	May (past peak)
29	Variegated Fritillary	Euptoieta claudia	Brush-footed Butterflies	16	Jun (past peak)
30	Gray Buckeye	Junonia grisea	Brush-footed Butterflies	16	Oct (rising)
31	Red Admiral	Vanessa atalanta	Brush-footed Butterflies	14	May (past peak)
32	American Snout	Libytheana carinenta	Brush-footed Butterflies	13	Oct (rising)
33	Mormon Fritillary	Argynnis mormonia	Brush-footed Butterflies	12	Jul (past peak)
34	Becker's White	Pontia beckerii	Whites, Yellows, and Sulphurs	11	May (past peak)
35	Satyr Comma	Polygonia satyrus	Brush-footed Butterflies	10	Jun (past peak)
36	Marine Blue	Leptotes marina	Gossamer-winged Butterflies	10	Jul (past peak)
37	Western White	Pontia occidentalis	Whites, Yellows, and Sulphurs	10	Jun (past peak)
38	Northern White-Skipper	Heliopetes ericetorum	Skippers	8	Jun (past peak)
39	Ceraunus Blue	Hemiargus ceraunus	Gossamer-winged Butterflies	7	Sep (peak)
40	Great Spangled Fritillary	Argynnis cybele	Brush-footed Butterflies	7	Aug (past peak)
41	Viceroy	Limenitis archippus	Brush-footed Butterflies	6	Aug (past peak)
42	Green Comma	Polygonia faunus	Brush-footed Butterflies	6	Sep (peak)
43	Reakirt's Blue	Echinargus isola	Gossamer-winged Butterflies	6	Jul (past peak)
44	Sleepy Orange	Eurema nicippe	Whites, Yellows, and Sulphurs	4	Sep (peak)
45	Margined White	Pieris marginalis	Whites, Yellows, and Sulphurs	4	Jul (past peak)
46	Western Tiger Swallowtail	Papilio rutulus	Swallowtails and Parnassians	3	Jun (past peak)
47	Tawny-edged Skipper	Polites themistocles	Skippers	3	Aug (past peak)
48	Common Ringlet	Coenonympha california	Brush-footed Butterflies	3	Jun (past peak)
49	Lupine Blue	Icaricia lupini	Gossamer-winged Butterflies	3	Jul (past peak)
50	Coral Hairstreak	Satyrium titus	Gossamer-winged Butterflies	3	Jul (past peak)