Butterflies Flying in Pennsylvania in August (60 Species)

60 butterflies were recorded flying in Pennsylvania in August in our iNaturalist sample; 25 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

Monarch5,787 obs.

Eastern Tiger Swallowtail3,767 obs.

Zabulon Skipper2,402 obs.

Silver-spotted Skipper2,200 obs.

Spicebush Swallowtail1,763 obs.

Huron Skipper1,692 obs.

Black Swallowtail1,367 obs.

Pearl Crescent1,205 obs.

Peck's Skipper1,162 obs.

Small White1,151 obs.

Great Spangled Fritillary994 obs.

Eastern Tailed-Blue903 obs.

All butterflies flying in Pennsylvania in August

#	Species	Scientific name	Family	Obs.	Peak in state
1	Monarch	Danaus plexippus	Brush-footed Butterflies	5,787	Aug (peak)
2	Eastern Tiger Swallowtail	Papilio glaucus	Swallowtails and Parnassians	3,767	Jul (past peak)
3	Zabulon Skipper	Lon zabulon	Skippers	2,402	Aug (peak)
4	Silver-spotted Skipper	Epargyreus clarus	Skippers	2,200	Aug (peak)
5	Spicebush Swallowtail	Papilio troilus	Swallowtails and Parnassians	1,763	Aug (peak)
6	Huron Skipper	Atalopedes huron	Skippers	1,692	Sep (rising)
7	Black Swallowtail	Papilio polyxenes	Swallowtails and Parnassians	1,367	Aug (peak)
8	Pearl Crescent	Phyciodes tharos	Brush-footed Butterflies	1,205	Aug (peak)
9	Peck's Skipper	Polites peckius	Skippers	1,162	Aug (peak)
10	Small White	Pieris rapae	Whites, Yellows, and Sulphurs	1,151	Jul (past peak)
11	Great Spangled Fritillary	Argynnis cybele	Brush-footed Butterflies	994	Jul (past peak)
12	Eastern Tailed-Blue	Everes comyntas	Gossamer-winged Butterflies	903	Aug (peak)
13	Red-spotted Admiral	Limenitis arthemis	Brush-footed Butterflies	738	Aug (peak)
14	Red-banded Hairstreak	Calycopis cecrops	Gossamer-winged Butterflies	641	Aug (peak)
15	Wild Indigo Duskywing	Erynnis baptisiae	Skippers	561	Aug (peak)
16	Least Skipper	Ancyloxypha numitor	Skippers	555	Aug (peak)
17	Hackberry Emperor	Asterocampa celtis	Brush-footed Butterflies	533	Aug (peak)
18	Orange Sulphur	Colias eurytheme	Whites, Yellows, and Sulphurs	524	Aug (peak)
19	Variegated Fritillary	Euptoieta claudia	Brush-footed Butterflies	522	Sep (rising)
20	Common Buckeye	Junonia coenia	Brush-footed Butterflies	486	Sep (rising)
21	Gray Hairstreak	Strymon melinus	Gossamer-winged Butterflies	459	Aug (peak)
22	Summer Azure	Celastrina neglecta	Gossamer-winged Butterflies	442	Jul (past peak)
23	Eastern Comma	Polygonia comma	Brush-footed Butterflies	427	Aug (peak)
24	Red Admiral	Vanessa atalanta	Brush-footed Butterflies	423	Jul (past peak)
25	Meadow Fritillary	Boloria bellona	Brush-footed Butterflies	409	Aug (peak)
26	Northern Pearly-eye	Lethe anthedon	Brush-footed Butterflies	340	Jul (past peak)
27	Question Mark	Polygonia interrogationis	Brush-footed Butterflies	314	Jul (past peak)
28	Painted Lady	Vanessa cardui	Brush-footed Butterflies	255	Aug (peak)
29	Silvery Checkerspot	Chlosyne nycteis	Brush-footed Butterflies	233	Aug (peak)
30	Common Wood-Nymph	Cercyonis pegala	Brush-footed Butterflies	204	Jul (past peak)
31	Viceroy	Limenitis archippus	Brush-footed Butterflies	197	Sep (rising)
32	Clouded Sulphur	Colias philodice	Whites, Yellows, and Sulphurs	194	Aug (peak)
33	Eastern Giant Swallowtail	Heraclides cresphontes	Swallowtails and Parnassians	194	Aug (peak)
34	American Lady	Vanessa virginiensis	Brush-footed Butterflies	176	Jul (past peak)
35	Horace's Duskywing	Erynnis horatius	Skippers	171	Jul (past peak)
36	Pipevine Swallowtail	Battus philenor	Swallowtails and Parnassians	157	Jul (past peak)
37	Dun Skipper	Euphyes vestris	Skippers	150	Jul (past peak)
38	Common Checkered-Skipper	Burnsius communis	Skippers	147	Sep (rising)
39	Sleepy Orange	Eurema nicippe	Whites, Yellows, and Sulphurs	117	Aug (peak)
40	Zebra Swallowtail	Eurytides marcellus	Swallowtails and Parnassians	111	Jul (past peak)
41	Appalachian Brown	Lethe appalachia	Brush-footed Butterflies	111	Jul (past peak)
42	Common Sootywing	Pholisora catullus	Skippers	97	Aug (peak)
43	Common Ringlet	Coenonympha california	Brush-footed Butterflies	96	Jun (past peak)
44	Cloudless Sulphur	Phoebis sennae	Whites, Yellows, and Sulphurs	89	Aug (peak)
45	Fiery Skipper	Hylephila phyleus	Skippers	88	Oct (rising)
46	Aphrodite Fritillary	Argynnis aphrodite	Brush-footed Butterflies	82	Jul (past peak)
47	American Copper	Lycaena hypophlaeas	Gossamer-winged Butterflies	80	Jul (past peak)
48	American Snout	Libytheana carinenta	Brush-footed Butterflies	77	Jul (past peak)
49	Tawny Emperor	Asterocampa clyton	Brush-footed Butterflies	75	Jul (past peak)
50	Swarthy Skipper	Nastra lherminier	Skippers	68	Aug (peak)