Butterflies Flying in Colorado in August (60 Species)

60 butterflies were recorded flying in Colorado in August in our iNaturalist sample; 12 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 August

Monarch851 obs.

Common Checkered-Skipper626 obs.

Woodland Skipper611 obs.

Two-tailed Swallowtail511 obs.

Painted Lady505 obs.

Weidemeyer's Admiral445 obs.

Rocky Mountain Parnassian435 obs.

Small White353 obs.

Gray Hairstreak344 obs.

Mormon Fritillary299 obs.

Small Wood-Nymph278 obs.

American Branded Skipper256 obs.

All butterflies flying in Colorado in August

#	Species	Scientific name	Family	Obs.	Peak in state
1	Monarch	Danaus plexippus	Brush-footed Butterflies	851	Sep (rising)
2	Common Checkered-Skipper	Burnsius communis	Skippers	626	Aug (peak)
3	Woodland Skipper	Ochlodes sylvanoides	Skippers	611	Aug (peak)
4	Two-tailed Swallowtail	Papilio multicaudata	Swallowtails and Parnassians	511	Jul (past peak)
5	Painted Lady	Vanessa cardui	Brush-footed Butterflies	505	Sep (rising)
6	Weidemeyer's Admiral	Limenitis weidemeyerii	Brush-footed Butterflies	445	Jul (past peak)
7	Rocky Mountain Parnassian	Parnassius smintheus	Swallowtails and Parnassians	435	Jul (past peak)
8	Small White	Pieris rapae	Whites, Yellows, and Sulphurs	353	Jul (past peak)
9	Gray Hairstreak	Strymon melinus	Gossamer-winged Butterflies	344	Aug (peak)
10	Mormon Fritillary	Argynnis mormonia	Brush-footed Butterflies	299	Aug (peak)
11	Small Wood-Nymph	Cercyonis oetus	Brush-footed Butterflies	278	Jul (past peak)
12	American Branded Skipper	Hesperia colorado	Skippers	256	Aug (peak)
13	Variegated Fritillary	Euptoieta claudia	Brush-footed Butterflies	231	Jul (past peak)
14	Reakirt's Blue	Echinargus isola	Gossamer-winged Butterflies	220	Jul (past peak)
15	Viceroy	Limenitis archippus	Brush-footed Butterflies	219	Aug (peak)
16	Mourning Cloak	Nymphalis antiopa	Brush-footed Butterflies	206	Apr (past peak)
17	Peck's Skipper	Polites peckius	Skippers	204	Aug (peak)
18	Aphrodite Fritillary	Argynnis aphrodite	Brush-footed Butterflies	179	Jul (past peak)
19	Field Crescent	Phyciodes pulchella	Brush-footed Butterflies	178	May (past peak)
20	Hoary Comma	Polygonia gracilis	Brush-footed Butterflies	172	Jul (past peak)
21	Orange Sulphur	Colias eurytheme	Whites, Yellows, and Sulphurs	166	Jul (past peak)
22	Checkered White	Pontia protodice	Whites, Yellows, and Sulphurs	163	Jul (past peak)
23	Common Wood-Nymph	Cercyonis pegala	Brush-footed Butterflies	158	Jul (past peak)
24	Dainty Sulphur	Nathalis iole	Whites, Yellows, and Sulphurs	156	Oct (rising)
25	Melissa Blue	Plebejus melissa	Gossamer-winged Butterflies	153	Jul (past peak)
26	Red Admiral	Vanessa atalanta	Brush-footed Butterflies	146	Jun (past peak)
27	Black Swallowtail	Papilio polyxenes	Swallowtails and Parnassians	133	Jul (past peak)
28	Milbert's Tortoiseshell	Aglais milberti	Brush-footed Butterflies	102	Jul (past peak)
29	Green Comma	Polygonia faunus	Brush-footed Butterflies	101	Aug (peak)
30	Greenish Blue	Icaricia saepiolus	Gossamer-winged Butterflies	97	Jul (past peak)
31	Margined White	Pieris marginalis	Whites, Yellows, and Sulphurs	93	Jul (past peak)
32	Blue Copper	Tharsalea heteronea	Gossamer-winged Butterflies	93	Jul (past peak)
33	Taxiles Skipper	Lon taxiles	Skippers	89	Jul (past peak)
34	Queen	Danaus gilippus	Brush-footed Butterflies	88	Sep (rising)
35	Pine White	Neophasia menapia	Whites, Yellows, and Sulphurs	71	Aug (peak)
36	Purplish Copper	Tharsalea helloides	Gossamer-winged Butterflies	64	Sep (rising)
37	Clouded Sulphur	Colias philodice	Whites, Yellows, and Sulphurs	61	Sep (rising)
38	Common Sootywing	Pholisora catullus	Skippers	52	Jun (past peak)
39	Western Pygmy-Blue	Brephidium exilis	Gossamer-winged Butterflies	51	Sep (rising)
40	Marine Blue	Leptotes marina	Gossamer-winged Butterflies	51	Sep (rising)
41	Great Spangled Fritillary	Argynnis cybele	Brush-footed Butterflies	51	Jul (past peak)
42	Gorgone Checkerspot	Chlosyne gorgone	Brush-footed Butterflies	50	Jun (past peak)
43	American Lady	Vanessa virginiensis	Brush-footed Butterflies	43	Oct (rising)
44	Anise Swallowtail	Papilio zelicaon	Swallowtails and Parnassians	40	Jun (past peak)
45	Huron Skipper	Atalopedes huron	Skippers	39	Sep (rising)
46	Least Skipper	Ancyloxypha numitor	Skippers	38	Aug (peak)
47	Question Mark	Polygonia interrogationis	Brush-footed Butterflies	37	Aug (peak)
48	Pearl Crescent	Phyciodes tharos	Brush-footed Butterflies	36	Aug (peak)
49	Satyr Comma	Polygonia satyrus	Brush-footed Butterflies	30	Jul (past peak)
50	Common Buckeye	Junonia coenia	Brush-footed Butterflies	29	Oct (rising)