Butterflies Flying in Idaho in September (51 Species)

51 butterflies were recorded flying in Idaho in September in our iNaturalist sample; 7 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

Top butterflies in September

California Tortoiseshell222 obs.

Small White141 obs.

Mylitta Crescent125 obs.

Purplish Copper116 obs.

Woodland Skipper110 obs.

Monarch101 obs.

Common Checkered-Skipper98 obs.

Western Pygmy-Blue86 obs.

Orange Sulphur59 obs.

Clouded Sulphur55 obs.

Juba Skipper53 obs.

Satyr Comma51 obs.

All butterflies flying in Idaho in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	California Tortoiseshell	Nymphalis californica	Brush-footed Butterflies	222	Jul (past peak)
2	Small White	Pieris rapae	Whites, Yellows, and Sulphurs	141	Jul (past peak)
3	Mylitta Crescent	Phyciodes mylitta	Brush-footed Butterflies	125	Sep (peak)
4	Purplish Copper	Tharsalea helloides	Gossamer-winged Butterflies	116	Sep (peak)
5	Woodland Skipper	Ochlodes sylvanoides	Skippers	110	Aug (past peak)
6	Monarch	Danaus plexippus	Brush-footed Butterflies	101	Aug (past peak)
7	Common Checkered-Skipper	Burnsius communis	Skippers	98	Sep (peak)
8	Western Pygmy-Blue	Brephidium exilis	Gossamer-winged Butterflies	86	Sep (peak)
9	Orange Sulphur	Colias eurytheme	Whites, Yellows, and Sulphurs	59	Sep (peak)
10	Clouded Sulphur	Colias philodice	Whites, Yellows, and Sulphurs	55	Sep (peak)
11	Juba Skipper	Hesperia juba	Skippers	53	May (past peak)
12	Satyr Comma	Polygonia satyrus	Brush-footed Butterflies	51	Apr (past peak)
13	Painted Lady	Vanessa cardui	Brush-footed Butterflies	49	Jul (past peak)
14	Viceroy	Limenitis archippus	Brush-footed Butterflies	44	Jul (past peak)
15	Common Ringlet	Coenonympha california	Brush-footed Butterflies	44	Jun (past peak)
16	Field Crescent	Phyciodes pulchella	Brush-footed Butterflies	44	Jul (past peak)
17	Red Admiral	Vanessa atalanta	Brush-footed Butterflies	30	Jul (past peak)
18	Mourning Cloak	Nymphalis antiopa	Brush-footed Butterflies	30	Apr (past peak)
19	Northern White-Skipper	Heliopetes ericetorum	Skippers	28	Jun (past peak)
20	Two-tailed Swallowtail	Papilio multicaudata	Swallowtails and Parnassians	25	Jun (past peak)
21	Checkered White	Pontia protodice	Whites, Yellows, and Sulphurs	23	Jul (past peak)
22	Western White	Pontia occidentalis	Whites, Yellows, and Sulphurs	23	Jul (past peak)
23	Hoary Comma	Polygonia gracilis	Brush-footed Butterflies	20	Aug (past peak)
24	Coronis Fritillary	Argynnis coronis	Brush-footed Butterflies	19	Jul (past peak)
25	Western Tiger Swallowtail	Papilio rutulus	Swallowtails and Parnassians	18	Jun (past peak)
26	West Coast Lady	Vanessa annabella	Brush-footed Butterflies	17	May (past peak)
27	Lorquin's Admiral	Limenitis lorquini	Brush-footed Butterflies	17	Jul (past peak)
28	Gray Hairstreak	Strymon melinus	Gossamer-winged Butterflies	14	Jul (past peak)
29	Green Comma	Polygonia faunus	Brush-footed Butterflies	14	Aug (past peak)
30	Becker's White	Pontia beckerii	Whites, Yellows, and Sulphurs	14	Jul (past peak)
31	American Branded Skipper	Hesperia colorado	Skippers	13	Aug (past peak)
32	Common Wood-Nymph	Cercyonis pegala	Brush-footed Butterflies	12	Jul (past peak)
33	Milbert's Tortoiseshell	Aglais milberti	Brush-footed Butterflies	12	Jun (past peak)
34	American Lady	Vanessa virginiensis	Brush-footed Butterflies	9	Sep (peak)
35	Pine White	Neophasia menapia	Whites, Yellows, and Sulphurs	9	Aug (past peak)
36	Mormon Fritillary	Argynnis mormonia	Brush-footed Butterflies	9	Aug (past peak)
37	Weidemeyer's Admiral	Limenitis weidemeyerii	Brush-footed Butterflies	8	Jul (past peak)
38	Sandhill Skipper	Polites sabuleti	Skippers	7	Aug (past peak)
39	Field Skipper	Atalopedes campestris	Skippers	4	Aug (past peak)
40	Melissa Blue	Plebejus melissa	Gossamer-winged Butterflies	4	Jul (past peak)
41	Lupine Blue	Icaricia lupini	Gossamer-winged Butterflies	3	Jun (past peak)
42	Acmon Blue	Icaricia acmon	Gossamer-winged Butterflies	3	Jun (past peak)
43	Essex Skipper	Thymelicus lineola	Skippers	2	Jul (past peak)
44	Variegated Fritillary	Euptoieta claudia	Brush-footed Butterflies	2	Jul (past peak)
45	Rocky Mountain Parnassian	Parnassius smintheus	Swallowtails and Parnassians	2	Jul (past peak)
46	Callippe Fritillary	Argynnis callippe	Brush-footed Butterflies	2	Jul (past peak)
47	Anise Swallowtail	Papilio zelicaon	Swallowtails and Parnassians	1	Jun (past peak)
48	Common Sootywing	Pholisora catullus	Skippers	1	May (past peak)
49	Northern Crescent	Phyciodes cocyta	Brush-footed Butterflies	1	Jun (past peak)
50	Great Spangled Fritillary	Argynnis cybele	Brush-footed Butterflies	1	Jul (past peak)