Butterflies Flying in Maryland in September (60 Species)

60 butterflies were recorded flying in Maryland in September in our iNaturalist sample; 14 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 Dec

Top butterflies in September

Huron Skipper3,837 obs.

Monarch3,402 obs.

Eastern Tiger Swallowtail1,744 obs.

Common Buckeye1,731 obs.

Pearl Crescent1,419 obs.

Variegated Fritillary1,352 obs.

Eastern Tailed-Blue1,119 obs.

Black Swallowtail903 obs.

Silver-spotted Skipper898 obs.

Peck's Skipper878 obs.

Small White766 obs.

Gray Hairstreak689 obs.

All butterflies flying in Maryland in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	Huron Skipper	Atalopedes huron	Skippers	3,837	Sep (peak)
2	Monarch	Danaus plexippus	Brush-footed Butterflies	3,402	Aug (past peak)
3	Eastern Tiger Swallowtail	Papilio glaucus	Swallowtails and Parnassians	1,744	Aug (past peak)
4	Common Buckeye	Junonia coenia	Brush-footed Butterflies	1,731	Sep (peak)
5	Pearl Crescent	Phyciodes tharos	Brush-footed Butterflies	1,419	Sep (peak)
6	Variegated Fritillary	Euptoieta claudia	Brush-footed Butterflies	1,352	Sep (peak)
7	Eastern Tailed-Blue	Everes comyntas	Gossamer-winged Butterflies	1,119	Sep (peak)
8	Black Swallowtail	Papilio polyxenes	Swallowtails and Parnassians	903	Aug (past peak)
9	Silver-spotted Skipper	Epargyreus clarus	Skippers	898	Aug (past peak)
10	Peck's Skipper	Polites peckius	Skippers	878	Sep (peak)
11	Small White	Pieris rapae	Whites, Yellows, and Sulphurs	766	Jun (past peak)
12	Gray Hairstreak	Strymon melinus	Gossamer-winged Butterflies	689	Sep (peak)
13	Fiery Skipper	Hylephila phyleus	Skippers	639	Sep (peak)
14	Spicebush Swallowtail	Papilio troilus	Swallowtails and Parnassians	510	Aug (past peak)
15	Painted Lady	Vanessa cardui	Brush-footed Butterflies	410	Sep (peak)
16	Red Admiral	Vanessa atalanta	Brush-footed Butterflies	407	Jul (past peak)
17	Least Skipper	Ancyloxypha numitor	Skippers	381	Jul (past peak)
18	Orange Sulphur	Colias eurytheme	Whites, Yellows, and Sulphurs	369	Sep (peak)
19	Red-banded Hairstreak	Calycopis cecrops	Gossamer-winged Butterflies	365	Aug (past peak)
20	Red-spotted Admiral	Limenitis arthemis	Brush-footed Butterflies	355	Aug (past peak)
21	Sleepy Orange	Eurema nicippe	Whites, Yellows, and Sulphurs	326	Aug (past peak)
22	Great Spangled Fritillary	Argynnis cybele	Brush-footed Butterflies	315	Jun (past peak)
23	Summer Azure	Celastrina neglecta	Gossamer-winged Butterflies	282	Jun (past peak)
24	Cloudless Sulphur	Phoebis sennae	Whites, Yellows, and Sulphurs	269	Sep (peak)
25	Eastern Comma	Polygonia comma	Brush-footed Butterflies	265	Apr (past peak)
26	Common Checkered-Skipper	Burnsius communis	Skippers	245	Oct (rising)
27	American Lady	Vanessa virginiensis	Brush-footed Butterflies	244	May (past peak)
28	Zabulon Skipper	Lon zabulon	Skippers	225	Aug (past peak)
29	Question Mark	Polygonia interrogationis	Brush-footed Butterflies	212	Aug (past peak)
30	Northern Pearly-eye	Lethe anthedon	Brush-footed Butterflies	198	Aug (past peak)
31	Viceroy	Limenitis archippus	Brush-footed Butterflies	175	Aug (past peak)
32	Ocola Skipper	Panoquina ocola	Skippers	161	Oct (rising)
33	Horace's Duskywing	Erynnis horatius	Skippers	120	Jul (past peak)
34	Wild Indigo Duskywing	Erynnis baptisiae	Skippers	113	Aug (past peak)
35	Common Wood-Nymph	Cercyonis pegala	Brush-footed Butterflies	113	Jul (past peak)
36	Zebra Swallowtail	Eurytides marcellus	Swallowtails and Parnassians	97	Jun (past peak)
37	Swarthy Skipper	Nastra lherminier	Skippers	92	Aug (past peak)
38	Silvery Checkerspot	Chlosyne nycteis	Brush-footed Butterflies	88	Jul (past peak)
39	White M Hairstreak	Parrhasius m-album	Gossamer-winged Butterflies	88	Sep (peak)
40	Pipevine Swallowtail	Battus philenor	Swallowtails and Parnassians	87	Jul (past peak)
41	Broad-winged Skipper	Poanes viator	Skippers	83	Jun (past peak)
42	Clouded Skipper	Lerema accius	Skippers	80	Sep (peak)
43	Clouded Sulphur	Colias philodice	Whites, Yellows, and Sulphurs	77	Jul (past peak)
44	Hackberry Emperor	Asterocampa celtis	Brush-footed Butterflies	77	Aug (past peak)
45	American Snout	Libytheana carinenta	Brush-footed Butterflies	73	Jul (past peak)
46	Long-tailed Skipper	Urbanus proteus	Skippers	73	Sep (peak)
47	Dun Skipper	Euphyes vestris	Skippers	69	Jul (past peak)
48	Meadow Fritillary	Boloria bellona	Brush-footed Butterflies	69	Aug (past peak)
49	American Copper	Lycaena hypophlaeas	Gossamer-winged Butterflies	63	Jul (past peak)
50	Tawny-edged Skipper	Polites themistocles	Skippers	40	Aug (past peak)