Butterflies Flying in Connecticut in September (60 Species)

60 butterflies were recorded flying in Connecticut in September 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.

Apr May Jun Jul Aug Sep Oct Nov

Top butterflies in September

Monarch1,073 obs.

Huron Skipper761 obs.

Small White199 obs.

Great Spangled Fritillary180 obs.

American Lady143 obs.

Common Buckeye133 obs.

Painted Lady124 obs.

Pearl Crescent122 obs.

Eastern Tailed-Blue122 obs.

Red-banded Hairstreak102 obs.

Silver-spotted Skipper95 obs.

American Copper87 obs.

All butterflies flying in Connecticut in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	Monarch	Danaus plexippus	Brush-footed Butterflies	1,073	Aug (past peak)
2	Huron Skipper	Atalopedes huron	Skippers	761	Sep (peak)
3	Small White	Pieris rapae	Whites, Yellows, and Sulphurs	199	Jul (past peak)
4	Great Spangled Fritillary	Argynnis cybele	Brush-footed Butterflies	180	Jul (past peak)
5	American Lady	Vanessa virginiensis	Brush-footed Butterflies	143	Aug (past peak)
6	Common Buckeye	Junonia coenia	Brush-footed Butterflies	133	Aug (past peak)
7	Painted Lady	Vanessa cardui	Brush-footed Butterflies	124	Sep (peak)
8	Pearl Crescent	Phyciodes tharos	Brush-footed Butterflies	122	Jul (past peak)
9	Eastern Tailed-Blue	Everes comyntas	Gossamer-winged Butterflies	122	Aug (past peak)
10	Red-banded Hairstreak	Calycopis cecrops	Gossamer-winged Butterflies	102	Aug (past peak)
11	Silver-spotted Skipper	Epargyreus clarus	Skippers	95	Jul (past peak)
12	American Copper	Lycaena hypophlaeas	Gossamer-winged Butterflies	87	Aug (past peak)
13	Spicebush Swallowtail	Papilio troilus	Swallowtails and Parnassians	84	Aug (past peak)
14	Viceroy	Limenitis archippus	Brush-footed Butterflies	82	Sep (peak)
15	Peck's Skipper	Polites peckius	Skippers	78	Aug (past peak)
16	Eastern Tiger Swallowtail	Papilio glaucus	Swallowtails and Parnassians	76	Aug (past peak)
17	Gray Hairstreak	Strymon melinus	Gossamer-winged Butterflies	75	Aug (past peak)
18	Zabulon Skipper	Lon zabulon	Skippers	70	Aug (past peak)
19	Orange Sulphur	Colias eurytheme	Whites, Yellows, and Sulphurs	69	Sep (peak)
20	Black Swallowtail	Papilio polyxenes	Swallowtails and Parnassians	67	Aug (past peak)
21	Red Admiral	Vanessa atalanta	Brush-footed Butterflies	54	Jul (past peak)
22	Clouded Sulphur	Colias philodice	Whites, Yellows, and Sulphurs	54	Sep (peak)
23	Wild Indigo Duskywing	Erynnis baptisiae	Skippers	46	Jul (past peak)
24	Fiery Skipper	Hylephila phyleus	Skippers	36	Sep (peak)
25	Eastern Comma	Polygonia comma	Brush-footed Butterflies	36	Jul (past peak)
26	Ocola Skipper	Panoquina ocola	Skippers	24	Sep (peak)
27	Cloudless Sulphur	Phoebis sennae	Whites, Yellows, and Sulphurs	23	Sep (peak)
28	Mourning Cloak	Nymphalis antiopa	Brush-footed Butterflies	23	Apr (past peak)
29	Least Skipper	Ancyloxypha numitor	Skippers	23	Aug (past peak)
30	Variegated Fritillary	Euptoieta claudia	Brush-footed Butterflies	23	Sep (peak)
31	Question Mark	Polygonia interrogationis	Brush-footed Butterflies	22	Jul (past peak)
32	White M Hairstreak	Parrhasius m-album	Gossamer-winged Butterflies	21	Sep (peak)
33	Eastern Giant Swallowtail	Heraclides cresphontes	Swallowtails and Parnassians	20	Aug (past peak)
34	Summer Azure	Celastrina neglecta	Gossamer-winged Butterflies	17	Aug (past peak)
35	Red-spotted Admiral	Limenitis arthemis	Brush-footed Butterflies	14	Jul (past peak)
36	Long-tailed Skipper	Urbanus proteus	Skippers	10	Sep (peak)
37	Bronze Copper	Tharsalea hyllus	Gossamer-winged Butterflies	9	Jun (past peak)
38	Tawny-edged Skipper	Polites themistocles	Skippers	7	Aug (past peak)
39	Swarthy Skipper	Nastra lherminier	Skippers	7	Aug (past peak)
40	Common Wood-Nymph	Cercyonis pegala	Brush-footed Butterflies	6	Jul (past peak)
41	Pipevine Swallowtail	Battus philenor	Swallowtails and Parnassians	5	Jul (past peak)
42	Northern Crescent	Phyciodes cocyta	Brush-footed Butterflies	5	Jul (past peak)
43	Common Sootywing	Pholisora catullus	Skippers	4	Aug (past peak)
44	Broad-winged Skipper	Poanes viator	Skippers	4	Aug (past peak)
45	Common Ringlet	Coenonympha california	Brush-footed Butterflies	3	Jun (past peak)
46	Juniper Hairstreak	Callophrys gryneus	Gossamer-winged Butterflies	3	May (past peak)
47	American Silver-bordered Fritillary	Boloria myrina	Brush-footed Butterflies	3	Jul (past peak)
48	Little Yellow	Eurema lisa	Whites, Yellows, and Sulphurs	2	Sep (peak)
49	American Snout	Libytheana carinenta	Brush-footed Butterflies	2	Aug (past peak)
50	Harvester	Feniseca tarquinius	Gossamer-winged Butterflies	2	Aug (past peak)