Flight Periods

Interactive phenology tool – You can also select this interactive tool developed by Herb Wilson to examine flight periods and to compare several species simultaneously.     PHENOLOGY TOOL

 

  Feb March April May June July August Sept Oct Nov
  No. Earliest Latest E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E
Skippers
Silver-spotted Skipper 211 17-May 30-Aug 1 1 4 5 4 10 11 21 38 27 26 18 16 15 3 8 2 1
Northern Cloudywing 145 21-May 20-Jul 1 15 24 25 27 18 23 7 4 1
Southern Cloudywing 2 1-Jun 14-Jun 1 1
Long-tailed Skipper 3 19-Aug 21-Aug 1 2
Dreamy Duskywing 357 7-May 25-Jul 6 13 50 66 43 44 69 30 16 14 3 1 1 1
Sleepy Duskywing 26 2-May 2-Jun 3 4 7 4 7 1
Juvenal’s Duskywing 190 24-Apr 11-Jul 1 1 4 7 16 31 20 37 31 22 11 7 1 1
Wild Indigo Duskywing   79 22-Apr 27-Sep 1 4 1 5 2 3 1 1 4 7 13 11 7 4 5 6 2 2
Common Sootywing 1 18-Aug 18-Aug 1
Arctic Skipper 228 13-May 17-Jul 1 1 5 31 36 79 45 16 8 4 2
Fiery Skipper 3 1-Aug 9-Aug 1 1 1
Least Skipper 271 30-May 27-Sep 3 3 13 3 16 28 23 28 24 18 10 14 12 29 15 13 6 5 7 1
European Skipper 661 5-Jun 20-Aug 2 14 17 51 99 170 117 93 54 32 4 2 3 3
Laurentian Skipper 131 27-Jul 16-Sep 3 10 26 43 19 19 7 2 2
Leonard’s Skipper 28 5-Aug 13-Sep 1 4 4 9 4 4 2
Cobweb Skipper 10 13-May 11-Jun 1 2 3 1 3
Indian Skipper 158 21-May 15-Jul 2 17 31 35 22 24 14 8 2 3
Peck’s Skipper 542 21-May 8-Oct 1 5 15 25 22 35 49 87 78 75 39 30 8 6 12 10 13 6 7 3 9 5 2
Tawny-edged Skipper 274 21-May 20-Sep 1 4 19 26 31 28 60 36 33 17 3 2 1 2 1 4 2 1 2 1
Crossline Skipper 69 10-Jun 25-Sep 2 3 5 9 13 15 13 6 2 1
Long Dash Skipper 632 30-May 15-Sep 2 9 32 33 54 101 170 86 81 34 19 6 3 1 1
Northern Broken Dash 152 18-Jun 14-Aug 1 6 21 29 38 20 20 10 4 3
Little Glassywing Skipper 49 15-Jun 3-Aug 2 1 15 13 8 5 4 1
Delaware Skipper 99 30-Jun 7-Aug 1 4 23 24 23 21 2 1
Hobomok Skipper 616 4-Apr 12-Aug 1 1 1 4 50 73 103 115 95 72 56 29 10 3 1 1 1
Mulberry Wing 19 5-Jul 13-Aug 2 1 4 3 7 1 1
Broadwinged Skipper 14 2-Jul 14-Aug 1 6 5 1 1
Two-spotted Skipper 79 6-Jun 24-Jul 1 6 18 26 15 10 3
Dun Skipper 621 20-Jun 3-Sep 4 23 84 97 140 107 91 46 12 9 5 2 1
Dusted Skipper 15 30-May 20-Jun 2 7 5 1
Black Dash 31 3-Jul 13-Aug 2 7 1 8 10 2 1
Pepper & Salt Skipper 100 26-May 11-Jul 5 25 22 22 12 4 6 4
Common Roadside Skipper 117 5-May 26-Jul 6 14 24 20 24 11 8 6 1 2 1
Feb March April May June July August Sept Oct Nov
Swallowtails D A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E
Pipevine Swallowtail 2 28-Sep 29-Sep 2
Black Swallowtail 176 1-May 10-Sep 4 3 6 6 8 8 11 6 6 1 1 1 4 14 21 14 18 10 12 18 3 1
Eastern Tiger Swallowtail 14 13-Jun 2-Sep 2 1 2 1 1 2 4 1
Canadian Tiger Swallowtail 907 30-Apr 12-Aug 1 1 9 31 97 89 149 173 121 86 83 39 17 8 1 2
Spicebush Swallowtail 5 11-Jul 13-Aug 1 1 1 1 1
Giant Swallowtail 16 1-Aug 5-Set 4 2 3 3 3 1
Short-tailed Swallowtail 1  NA  NA
Feb March April May June July August Sept Oct Nov
Sulphurs & Whites D A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E
Checkered White 1 9-Aug 9-Aug 1
Cabbage White 1118 17-Mar 26-Oct 1 2 6 3 7 23 23 25 21 41 22 18 16 14 26 48 32 43 46 56 54 54 92 73 125 78 49 31 24 33 11 11 7 2 1
Large White 2 25-Jul 25-Jul 2
Mustard White 123 5-May 7-Sep 1 7 10 9 7 7 8 8 1 8 5 6 17 14 6 5 1 2 1
Clouded Sulphur 1367 1-May 7-Nov 14 15 36 53 68 46 31 27 8 11 34 60 73 76 113 51 45 44 77 102 89 68 59 54 42 30 20 7 9 2 2 1
Alfalfa Butterfly 471 15-May 14-Nov 2 2 3 12 11 5 12 4 22 11 11 23 30 21 22 29 34 41 32 27 22 19 34 10 16 10 3 1 1 1
Pink-edged Sulphur 296 10-Jun 18-Sep 1 4 6 22 54 53 48 51 35 11 2 4 1 2 1 1
Cloudless Sulphur 3 19-Aug 19-Sep 1 1 1
Orange-barred Sulphur 1 Aug Aug
Large Orange Sulphur 1 3-Sep 3-Sep
Little Sulphur 11 12-Jun 24-Aug 1 3 3 1 2 1
Hairstreaks, Blues, Coppers, & Harvesters
Harvesters
Harvester 121 13-May 30-Aug 4 4 9 4 7 13 5 11 6 2 6 12 5 7 9 7 5 5
Feb March April May June July August Sept Oct Nov
Hairstreaks, Blues, & Coppers D A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E
American Copper 465 10-May 22-Oct 2 1 3 19 31 31 25 22 14 17 11 6 11 17 26 21 39 49 36 20 17 14 10 17 1 2 3
Bronze Copper 85 10-Jun 7-Oct 1 1 7 6 12 6 5 1 3 7 4 5 9 5 3 7 1 1 1
Bog Copper 180 24-Jun 22-Aug 2 2 43 38 38 22 19 5 9 2
Clayton’s Copper 68 21-Jul 20-Sep 4 19 28 9 3 1 3 1
Hessel’s Hairstreak 9 14-May 6-Jun 3 2 3 1
Juniper Hairstreak 5 16-May 28-May  1  3 
Brown Elfin 243 13-Apr 26-Jun 3 3 3 20 24 41 38 41 25 20 17 7 1
Hoary Elfin 39 29-Apr 12-Jun 1 2 6 10 16 3 1
Henry’s Elfin 30 5-May 21-Jun 1 1 1 4 9 9 2 1 1 1
Bog Elfin 136 5-May 10-Jun 2 3 33 27 49 20 2
Eastern Pine Elfin 330 16-Apr 20-Jul 3 3 8 22 34 66 66 62 31 11 10 10 3 1
Western Pine Elfin 34 12-May 9-Jun 1 2 6 13 9 3
Coral Hairstreak 27 2-Jul 6-Aug 4 4 8 6 3 2
Acadian Hairstreak 37 3-Jul 9-Aug 3 7 11 7 5 3 1
Edwards’ Hairstreak 11 10-Jul 29-Jul 2 1 5 3
Banded Hairstreak 116 19-Jun 3-Sep 1 1 12 20 25 24 16 9 3 3 1 1
Striped Hairstreak 72 4-Jul 21-Aug 4 8 20 19 7 7 3 2 2
Grey Hairstreak 37 15-May 27-Sep 1 1 3 2 2 2 3 2 2 2 3 4 1 2 2 1 1 3
Early Hairstreak 7 18-May 22-Jun 1 1 1 1 2 1
Eastern Tailed Blue 428 13-May 13-Oct 1 1 3 5 15 7 5 1 3 5 17 18 18 18 21 15 26 42 46 57 22 27 22 10 16 3 3 1
Western Tailed Blue 5 20-Jun 10-Jul 1 2 1 1
Northern Azure 970 20-Apr 11-Sep 1 4 9 11 26 54 94 88 147 88 96 91 37 34 45 43 34 26 25 3 1 4 6 1 1 1
New England Azure  18 16-Apr 7-May 3 5 2 6 2
Summer Azure 134 10-May 26-Sep 1 1 13 17 17 28 25 11 4 8 4 1 1 1 1 1
Silvery Blue 362 26-Apr 17-Jul 1 4 4 15 15 53 34 57 80 50 26 12 10 1
Crowberry Blue 26 27-Jun 24-Jul 1 5 11 5 6
Northern Blue   1 13-Jul   13-Jul  1 
Greenish Blue 72 18-May 15-Jul 1 1 2 13 15 17 15 7 1
Feb March April May June July August Sept Oct Nov
Brushfoots, Monarchs, Satyrs D A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E
Snouts
Eastern Snout 2 10-Jul 2-Aug 1 1
Monarchs or Milkweed Butterflies
Monarch 490 8-Jun 25-Oct 1 1 3 3 4 14 18 19 22 35 39 25 28 33 34 33 32 33 38 23 24 9 8 4 6 1
Fritillaries
Variegated Fritillary 30 21-May 30-Oct 1 1 1 2 1 2 2 1 2 1 2 2 4 1 2 3 1 1
Great Spangled Fritillary 776 16-Jun 3-Oct 1 2 17 24 87 86 94 113 89 59 35 38 36 39 22 14 9 4 6 1
Aphrodite Fritillary 221 27-Jun 25-Sep 3 16 18 23 34 46 17 20 18 12 2 2 5 1 3 1
Regal Fritillary 4 6-Jul 3-Aug 1 2 1
Atlantis Fritillary 780 4-Jun 13-Sep 6 4 30 28 52 92 91 86 79 100 39 38 48 53 22 6 3 3
Bog Fritillary 63 6-Jun 12-Jul 1 6 19 18 11 1 7
Silver-bordered Fritillary   572 18-May 21-Sep 1 3 8 24 28 52 70 47 26 31 20 17 18 38 30 32 42 48 17 9 8 2 1
Meadow Fritillary 156 25-Apr 16-Sep 1 1 1 6 5 16 5 4 1 10 14 21 12 9 7 4 8 7 11 6 3 4
Frigga Fritillary 5 11-Jun 24-Jun 4 1
Purple Lesser Fritillary 5 3-Jul 20-Jul 1 1 3
Feb March April May June July August Sept Oct Nov
Checkerspots, Tortoiseshells, Commas, & Ladies D A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E
Silvery Checkerspot 22 7-Jun 8-Jul 4 5 5 1 5 2
Harris’s Checkerspot 406 29-May 4-Sep 3 12 30 49 81 86 88 40 11 3 2 1
Pearl Crescent 376 5-May 11-Oct 3 6 21 14 33 24 13 5 4 4 10 14 17 51 17 20 21 11 23 7 13 18 7 13 3 3 1
Northern Pearl Crescent 1070 24-May 6-Oct 2 19 31 68 129 131 128 169 132 88 68 28 10 13 10 15 11 5 7 1 2 2 1
Baltimore Checkerspot 131 9-Jun 31-Jul 1 2 14 17 24 25 19 12 12 5
Common Buckeye 120 22-Jun 30-Oct 2 2 8 2 4 5 8 5 6 17 13 12 5 9 9 4 4 1 3 1
Question Mark 236 11-Apr 9-Nov 1 1 1 3 5 4 6 22 9 14 14 8 21 15 15 10 7 6 7 8 8 8 9 9 7 6 1 1 7 1 1 1
Eastern Comma 126 1-Apr 12-Oct 1 5 1 2 3 2 4 3 3 3 1 1 8 5 10 7 4 5 10 7 4 3 4 3 2 2 1 1
Satyr Comma 2 12-Jun 27-Jul 1 1 1
Green Comma 217 4-Apr 17-Sep 2 1 1 1 1 1 5 11 7 6 5 12 2 3 3 4 9 15 21 16 15 20 21 20 8 3 4
Hoary Comma 61 20-May 9-Sep 3 1 1 2 2 4 8 2 8 7 3 8 10 2
Grey Comma 112 6-May 19-Oct 2 3 2 5 3 1 6 2 2 2 9 8 11 10 6 9 7 7 3 5 3 4 1 1
Compton Tortoiseshell 79 28-Feb 2-Nov 1 2 1 2 3 1 1 2 2 1 4 6 5 1 6 4 9 8 7 5 1 3 2 1 1
Milbert’s Tortoiseshell 95 17-Mar 19-Oct 1 2 1 1 1 1 3 2 8 11 2 7 2 9 7 6 3 7 5 2 3 3 1 1 1 3 1 1
Mourning Cloak 509 2-Apr 25-Oct 1 1 3 5 6 4 3 16 16 20 26 14 27 24 14 25 15 7 5 15 13 19 14 20 9 21 26 31 33 23 16 14 11 2 6 1 2 1
Red Admiral 520 20-Apr 28-Oct 2 5 2 15 24 39 28 43 16 25 17 17 28 33 20 15 21 22 13 11 10 19 23 23 12 13 7 5 4 4 2 2
Painted Lady 210 21-May 4-Oct 1 4 3 3 3 7 1 5 11 9 6 12 17 13 15 30 28 12 6 6 7 5 1 2 1 1 1
American Lady 821 28-Apr 2-Nov 3 2 6 19 30 45 51 86 51 39 34 16 13 17 33 29 48 48 37 33 30 29 26 17 12 18 6 17 7 10 5 1 2 1
White Admiral   738 16-May 1-Oct 2 3 5 14 48 63 81 94 57 44 34 34 28 30 57 59 44 20 11 8 1 1
Viceroy 590 24-May 28-Sep 1 11 13 35 38 47 22 34 15 13 11 27 39 47 59 60 55 17 30 7 4 5
Feb March April May June July August Sept Oct Nov
Satyrs & Arctics       D A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E
Northern Pearly-Eye 386 25-Jun 7-Sep 1 1 19 43 52 66 61 64 32 17 17 5 6 1 1
Eyed Brown 261 25-Jun 7-Aug 15 55 66 60 38 24 2 1
Appalachian Brown 24 5-Jul 1-Sep 1 3 6 4 2 2 2 1 2 1
Little Wood Satyr 210 29-May 27-Aug 6 16 28 48 31 32 25 14 3 3 1 2 1
Inornate Ringlet 1374 20-May 6-Oct 2 10 52 51 106 148 125 109 119 44 23 12 21 18 27 79 104 125 87 48 32 14 15 3
Common Wood Nymph   420 30-Jun 25-Sep
Jutta Arctic 125 18-May 18-Jul 1 2 11 22 35 34 12 5 2 1
Katahdin Arctic 82 23-Jun 27-Jul 1 2 29 35 9 4 2
D A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E A B C D E
Feb March April May June July August Sept Oct Nov