Butterflies Flying in Pennsylvania in July (60 Species)

60 butterflies were recorded flying in Pennsylvania in July in our iNaturalist sample; 21 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 July

Eastern Tiger Swallowtail4,016 obs.

Monarch3,575 obs.

Silver-spotted Skipper1,889 obs.

Spicebush Swallowtail1,669 obs.

Great Spangled Fritillary1,412 obs.

Small White1,315 obs.

Huron Skipper1,310 obs.

Red Admiral1,183 obs.

Black Swallowtail1,075 obs.

Pearl Crescent938 obs.

Eastern Tailed-Blue766 obs.

Peck's Skipper728 obs.

All butterflies flying in Pennsylvania in July

#	Species	Scientific name	Family	Obs.	Peak in state
1	Eastern Tiger Swallowtail	Papilio glaucus	Swallowtails and Parnassians	4,016	Jul (peak)
2	Monarch	Danaus plexippus	Brush-footed Butterflies	3,575	Aug (rising)
3	Silver-spotted Skipper	Epargyreus clarus	Skippers	1,889	Aug (rising)
4	Spicebush Swallowtail	Papilio troilus	Swallowtails and Parnassians	1,669	Aug (rising)
5	Great Spangled Fritillary	Argynnis cybele	Brush-footed Butterflies	1,412	Jul (peak)
6	Small White	Pieris rapae	Whites, Yellows, and Sulphurs	1,315	Jul (peak)
7	Huron Skipper	Atalopedes huron	Skippers	1,310	Sep (rising)
8	Red Admiral	Vanessa atalanta	Brush-footed Butterflies	1,183	Jul (peak)
9	Black Swallowtail	Papilio polyxenes	Swallowtails and Parnassians	1,075	Aug (rising)
10	Pearl Crescent	Phyciodes tharos	Brush-footed Butterflies	938	Aug (rising)
11	Eastern Tailed-Blue	Everes comyntas	Gossamer-winged Butterflies	766	Aug (rising)
12	Peck's Skipper	Polites peckius	Skippers	728	Aug (rising)
13	Summer Azure	Celastrina neglecta	Gossamer-winged Butterflies	520	Jul (peak)
14	Red-spotted Admiral	Limenitis arthemis	Brush-footed Butterflies	499	Aug (rising)
15	Zabulon Skipper	Lon zabulon	Skippers	493	Aug (rising)
16	Orange Sulphur	Colias eurytheme	Whites, Yellows, and Sulphurs	405	Aug (rising)
17	Northern Pearly-eye	Lethe anthedon	Brush-footed Butterflies	380	Jul (peak)
18	Question Mark	Polygonia interrogationis	Brush-footed Butterflies	376	Jul (peak)
19	Common Wood-Nymph	Cercyonis pegala	Brush-footed Butterflies	355	Jul (peak)
20	Meadow Fritillary	Boloria bellona	Brush-footed Butterflies	345	Aug (rising)
21	Eastern Comma	Polygonia comma	Brush-footed Butterflies	343	Aug (rising)
22	Wild Indigo Duskywing	Erynnis baptisiae	Skippers	338	Aug (rising)
23	Little Glassywing	Vernia verna	Skippers	316	Jun (past peak)
24	Horace's Duskywing	Erynnis horatius	Skippers	312	Jul (peak)
25	American Lady	Vanessa virginiensis	Brush-footed Butterflies	297	Jul (peak)
26	Dun Skipper	Euphyes vestris	Skippers	296	Jul (peak)
27	Least Skipper	Ancyloxypha numitor	Skippers	283	Aug (rising)
28	Little Wood Satyr	Megisto cymela	Brush-footed Butterflies	268	Jun (past peak)
29	Banded Hairstreak	Satyrium calanus	Gossamer-winged Butterflies	233	Jun (past peak)
30	Northern Broken-Dash	Polites egeremet	Skippers	223	Jul (peak)
31	Variegated Fritillary	Euptoieta claudia	Brush-footed Butterflies	216	Sep (rising)
32	Pipevine Swallowtail	Battus philenor	Swallowtails and Parnassians	202	Jul (peak)
33	Gray Hairstreak	Strymon melinus	Gossamer-winged Butterflies	195	Aug (rising)
34	Appalachian Brown	Lethe appalachia	Brush-footed Butterflies	184	Jul (peak)
35	Mourning Cloak	Nymphalis antiopa	Brush-footed Butterflies	172	Apr (past peak)
36	Viceroy	Limenitis archippus	Brush-footed Butterflies	169	Sep (rising)
37	Aphrodite Fritillary	Argynnis aphrodite	Brush-footed Butterflies	163	Jul (peak)
38	Clouded Sulphur	Colias philodice	Whites, Yellows, and Sulphurs	150	Aug (rising)
39	American Copper	Lycaena hypophlaeas	Gossamer-winged Butterflies	147	Jul (peak)
40	Tawny Emperor	Asterocampa clyton	Brush-footed Butterflies	136	Jul (peak)
41	Common Buckeye	Junonia coenia	Brush-footed Butterflies	128	Sep (rising)
42	Hackberry Emperor	Asterocampa celtis	Brush-footed Butterflies	127	Aug (rising)
43	Zebra Swallowtail	Eurytides marcellus	Swallowtails and Parnassians	127	Jul (peak)
44	Baltimore Checkerspot	Euphydryas phaeton	Brush-footed Butterflies	126	Jun (past peak)
45	Painted Lady	Vanessa cardui	Brush-footed Butterflies	120	Aug (rising)
46	Delaware Skipper	Anatrytone logan	Skippers	113	Jul (peak)
47	American Snout	Libytheana carinenta	Brush-footed Butterflies	113	Jul (peak)
48	Red-banded Hairstreak	Calycopis cecrops	Gossamer-winged Butterflies	113	Aug (rising)
49	Silvery Checkerspot	Chlosyne nycteis	Brush-footed Butterflies	87	Aug (rising)
50	Atlantis Fritillary	Argynnis atlantis	Brush-footed Butterflies	67	Jul (peak)