Butterflies Flying in Oregon in September (60 Species)

60 butterflies were recorded flying in Oregon in September in our iNaturalist sample; 5 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 Tortoiseshell571 obs.

Woodland Skipper380 obs.

Mylitta Crescent320 obs.

Small White235 obs.

California Sister219 obs.

Lorquin's Admiral181 obs.

Common Ringlet153 obs.

Field Skipper144 obs.

American Lady125 obs.

Orange Sulphur122 obs.

Common Wood-Nymph97 obs.

Painted Lady93 obs.

All butterflies flying in Oregon in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	California Tortoiseshell	Nymphalis californica	Brush-footed Butterflies	571	Jul (past peak)
2	Woodland Skipper	Ochlodes sylvanoides	Skippers	380	Aug (past peak)
3	Mylitta Crescent	Phyciodes mylitta	Brush-footed Butterflies	320	Jul (past peak)
4	Small White	Pieris rapae	Whites, Yellows, and Sulphurs	235	Jul (past peak)
5	California Sister	Adelpha californica	Brush-footed Butterflies	219	Sep (peak)
6	Lorquin's Admiral	Limenitis lorquini	Brush-footed Butterflies	181	Jun (past peak)
7	Common Ringlet	Coenonympha california	Brush-footed Butterflies	153	May (past peak)
8	Field Skipper	Atalopedes campestris	Skippers	144	Sep (peak)
9	American Lady	Vanessa virginiensis	Brush-footed Butterflies	125	Aug (past peak)
10	Orange Sulphur	Colias eurytheme	Whites, Yellows, and Sulphurs	122	Jul (past peak)
11	Common Wood-Nymph	Cercyonis pegala	Brush-footed Butterflies	97	Jul (past peak)
12	Painted Lady	Vanessa cardui	Brush-footed Butterflies	93	Jul (past peak)
13	Monarch	Danaus plexippus	Brush-footed Butterflies	90	Jun (past peak)
14	Purplish Copper	Tharsalea helloides	Gossamer-winged Butterflies	90	Jun (past peak)
15	Gray Hairstreak	Strymon melinus	Gossamer-winged Butterflies	84	Jul (past peak)
16	Red Admiral	Vanessa atalanta	Brush-footed Butterflies	77	Jul (past peak)
17	Gray Buckeye	Junonia grisea	Brush-footed Butterflies	77	Sep (peak)
18	Common Checkered-Skipper	Burnsius communis	Skippers	76	Jul (past peak)
19	Hoary Comma	Polygonia gracilis	Brush-footed Butterflies	74	Jul (past peak)
20	Anise Swallowtail	Papilio zelicaon	Swallowtails and Parnassians	73	May (past peak)
21	Juba Skipper	Hesperia juba	Skippers	72	May (past peak)
22	Acmon Blue	Icaricia acmon	Gossamer-winged Butterflies	53	Aug (past peak)
23	Pine White	Neophasia menapia	Whites, Yellows, and Sulphurs	51	Aug (past peak)
24	Western White	Pontia occidentalis	Whites, Yellows, and Sulphurs	51	Jul (past peak)
25	American Branded Skipper	Hesperia colorado	Skippers	46	Jul (past peak)
26	West Coast Lady	Vanessa annabella	Brush-footed Butterflies	45	May (past peak)
27	Green Comma	Polygonia faunus	Brush-footed Butterflies	45	Aug (past peak)
28	Hydaspe Fritillary	Argynnis hydaspe	Brush-footed Butterflies	44	Jul (past peak)
29	Western Tiger Swallowtail	Papilio rutulus	Swallowtails and Parnassians	36	Jul (past peak)
30	Sandhill Skipper	Polites sabuleti	Skippers	31	Aug (past peak)
31	Mourning Cloak	Nymphalis antiopa	Brush-footed Butterflies	26	Apr (past peak)
32	Coronis Fritillary	Argynnis coronis	Brush-footed Butterflies	21	Jul (past peak)
33	Western Pygmy-Blue	Brephidium exilis	Gossamer-winged Butterflies	19	Sep (peak)
34	Clouded Sulphur	Colias philodice	Whites, Yellows, and Sulphurs	18	Sep (peak)
35	Satyr Comma	Polygonia satyrus	Brush-footed Butterflies	16	Jul (past peak)
36	Eastern Tailed-Blue	Everes comyntas	Gossamer-winged Butterflies	16	Jul (past peak)
37	Becker's White	Pontia beckerii	Whites, Yellows, and Sulphurs	16	Jul (past peak)
38	Mormon Fritillary	Argynnis mormonia	Brush-footed Butterflies	16	Aug (past peak)
39	Hedgerow Hairstreak	Satyrium saepium	Gossamer-winged Butterflies	15	Jul (past peak)
40	Milbert's Tortoiseshell	Aglais milberti	Brush-footed Butterflies	14	Jul (past peak)
41	Two-tailed Swallowtail	Papilio multicaudata	Swallowtails and Parnassians	13	Jul (past peak)
42	Viceroy	Limenitis archippus	Brush-footed Butterflies	12	Aug (past peak)
43	Great Spangled Fritillary	Argynnis cybele	Brush-footed Butterflies	11	Aug (past peak)
44	Margined White	Pieris marginalis	Whites, Yellows, and Sulphurs	10	Jul (past peak)
45	Clodius Parnassian	Parnassius clodius	Swallowtails and Parnassians	9	Jul (past peak)
46	Blue Copper	Tharsalea heteronea	Gossamer-winged Butterflies	9	Jul (past peak)
47	Checkered White	Pontia protodice	Whites, Yellows, and Sulphurs	8	Jul (past peak)
48	Greenish Blue	Icaricia saepiolus	Gossamer-winged Butterflies	8	Jun (past peak)
49	Great Purple Hairstreak	Atlides halesus	Gossamer-winged Butterflies	7	Aug (past peak)
50	Small Wood-Nymph	Cercyonis oetus	Brush-footed Butterflies	7	Jul (past peak)