Butterflies Flying in Montana in August (60 Species)

60 butterflies were recorded flying in Montana in August in our iNaturalist sample; 17 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 August

Common Wood-Nymph197 obs.

Mormon Fritillary183 obs.

Woodland Skipper181 obs.

Great Spangled Fritillary114 obs.

Mourning Cloak113 obs.

Essex Skipper113 obs.

California Tortoiseshell110 obs.

Small White102 obs.

Western White101 obs.

Milbert's Tortoiseshell88 obs.

Green Comma85 obs.

Satyr Comma82 obs.

All butterflies flying in Montana in August

#	Species	Scientific name	Family	Obs.	Peak in state
1	Common Wood-Nymph	Cercyonis pegala	Brush-footed Butterflies	197	Jul (past peak)
2	Mormon Fritillary	Argynnis mormonia	Brush-footed Butterflies	183	Aug (peak)
3	Woodland Skipper	Ochlodes sylvanoides	Skippers	181	Aug (peak)
4	Great Spangled Fritillary	Argynnis cybele	Brush-footed Butterflies	114	Aug (peak)
5	Mourning Cloak	Nymphalis antiopa	Brush-footed Butterflies	113	Aug (peak)
6	Essex Skipper	Thymelicus lineola	Skippers	113	Jul (past peak)
7	California Tortoiseshell	Nymphalis californica	Brush-footed Butterflies	110	Jul (past peak)
8	Small White	Pieris rapae	Whites, Yellows, and Sulphurs	102	Jul (past peak)
9	Western White	Pontia occidentalis	Whites, Yellows, and Sulphurs	101	Aug (peak)
10	Milbert's Tortoiseshell	Aglais milberti	Brush-footed Butterflies	88	Jul (past peak)
11	Green Comma	Polygonia faunus	Brush-footed Butterflies	85	May (past peak)
12	Satyr Comma	Polygonia satyrus	Brush-footed Butterflies	82	Aug (peak)
13	Pine White	Neophasia menapia	Whites, Yellows, and Sulphurs	77	Aug (peak)
14	Small Wood-Nymph	Cercyonis oetus	Brush-footed Butterflies	73	Jul (past peak)
15	Lorquin's Admiral	Limenitis lorquini	Brush-footed Butterflies	71	Jul (past peak)
16	Rocky Mountain Parnassian	Parnassius smintheus	Swallowtails and Parnassians	64	Jul (past peak)
17	Hoary Comma	Polygonia gracilis	Brush-footed Butterflies	62	Aug (peak)
18	Blue Copper	Tharsalea heteronea	Gossamer-winged Butterflies	61	Jul (past peak)
19	Clouded Sulphur	Colias philodice	Whites, Yellows, and Sulphurs	58	Aug (peak)
20	Two-tailed Swallowtail	Papilio multicaudata	Swallowtails and Parnassians	58	Jul (past peak)
21	Painted Lady	Vanessa cardui	Brush-footed Butterflies	55	Jul (past peak)
22	Monarch	Danaus plexippus	Brush-footed Butterflies	55	Aug (peak)
23	Hydaspe Fritillary	Argynnis hydaspe	Brush-footed Butterflies	48	Aug (peak)
24	Melissa Blue	Plebejus melissa	Gossamer-winged Butterflies	43	Aug (peak)
25	Common Checkered-Skipper	Burnsius communis	Skippers	42	Aug (peak)
26	Field Crescent	Phyciodes pulchella	Brush-footed Butterflies	34	Jul (past peak)
27	Gray Hairstreak	Strymon melinus	Gossamer-winged Butterflies	31	Jul (past peak)
28	Anise Swallowtail	Papilio zelicaon	Swallowtails and Parnassians	31	Jul (past peak)
29	Variegated Fritillary	Euptoieta claudia	Brush-footed Butterflies	30	Aug (peak)
30	Purplish Copper	Tharsalea helloides	Gossamer-winged Butterflies	26	Sep (rising)
31	Viceroy	Limenitis archippus	Brush-footed Butterflies	24	Jul (past peak)
32	Greenish Blue	Icaricia saepiolus	Gossamer-winged Butterflies	21	Jul (past peak)
33	Red Admiral	Vanessa atalanta	Brush-footed Butterflies	19	Aug (peak)
34	Mylitta Crescent	Phyciodes mylitta	Brush-footed Butterflies	19	Aug (peak)
35	Weidemeyer's Admiral	Limenitis weidemeyerii	Brush-footed Butterflies	19	Jul (past peak)
36	American Copper	Lycaena hypophlaeas	Gossamer-winged Butterflies	19	Aug (peak)
37	Aphrodite Fritillary	Argynnis aphrodite	Brush-footed Butterflies	19	Jul (past peak)
38	American Branded Skipper	Hesperia colorado	Skippers	14	Jul (past peak)
39	Orange Sulphur	Colias eurytheme	Whites, Yellows, and Sulphurs	12	Jul (past peak)
40	Callippe Fritillary	Argynnis callippe	Brush-footed Butterflies	12	Jul (past peak)
41	Boisduval's Blue	Icaricia icarioides	Gossamer-winged Butterflies	11	Jun (past peak)
42	West Coast Lady	Vanessa annabella	Brush-footed Butterflies	10	Sep (rising)
43	Margined White	Pieris marginalis	Whites, Yellows, and Sulphurs	9	Jul (past peak)
44	Western Tiger Swallowtail	Papilio rutulus	Swallowtails and Parnassians	8	Jun (past peak)
45	Northern Checkerspot	Chlosyne palla	Brush-footed Butterflies	8	Jul (past peak)
46	Checkered White	Pontia protodice	Whites, Yellows, and Sulphurs	8	Jul (past peak)
47	Coral Hairstreak	Satyrium titus	Gossamer-winged Butterflies	8	Jul (past peak)
48	Hedgerow Hairstreak	Satyrium saepium	Gossamer-winged Butterflies	6	Jul (past peak)
49	Clodius Parnassian	Parnassius clodius	Swallowtails and Parnassians	6	Jul (past peak)
50	Pacific Fritillary	Boloria epithore	Brush-footed Butterflies	6	Jul (past peak)