Butterfly flight periods in the Maritimes
Based on Maritimes Butterfly Atlas data (2010-2012). See explanatory notes below table.
				March		April					May					June					July					August					Sept					Oct					Nov
Common Name	No.	Earliest	Latest	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
Silver-spotted Skipper	0	3 Aug	3 Aug
Northern Cloudywing	57	27 May	18 Jul													4	11	14	13	6	3	5	1
Dreamy Duskywing	210	12 May	20 Jul									2	7	23	31	27	35	34	18	14	13	5	1
Juvenal's Duskywing	47	29 Mar	15 Jul		1						2	2	5	8	12	4	6	1	5		1
Arctic Skipper	186	24 May	25 Jul											1	5	9	46	42	38	26	13	5		1
Least Skipper	160	17 Jun	22 Sep															1	1	8	17	37	22	31	14	2	3	2	11	6	4	1
European Skipper	592	12 Jun	1 Sep														1	5	7	46	105	112	112	119	48	19	10	3	1	3	1
Fiery Skipper	1	29 Jul	26 Aug																											1
Common Branded Skipper	84	19 Jul	10 Sep																					1	4	6	7	17	20	19	8	2
Leonard's Skipper	0	-	-
				March		April					May					June					July					August					Sept					Oct					Nov
Common Name	No.	Earliest	Latest	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
Indian Skipper	5	12 Jun	22 Jul														1	2		1				1
Peck's Skipper	199	8 Jun	26 Sep														4	4	3	26	24	43	30	25	14	4	2	1	4	3	1	4	1	1	1	3	1
Tawny-edged Skipper	145	11 Jun	18 Aug														1	10	19	15	28	32	16	11	7	3		3
Crossline Skipper	6	7 Jul	21 Jul																			4		1
Long Dash Skipper	344	13 Jun	25 Aug															17	21	54	79	81	45	35	10			1		1
Hobomok Skipper	461	24 May	1 Aug											2	21	30	88	83	75	50	47	33	15	14	3
Two-spotted Skipper	5	22 Jun	11 Jul																2	1	2
Dun Skipper	156	21 Jun	15 Aug																2	6	12	38	34	32	22	8		2
Pepper and Salt Skipper	27	28 May	15 Jul												4	1	9	4	4	1	2	1	1
Common Roadside Skipper	34	26 May	15 Jul												2	4	9	6	5	3		4	1
				March		April					May					June					July					August					Sept					Oct					Nov
Common Name	No.	Earliest	Latest	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
Short-tailed Swallowtail	16	30 May	31 Aug													1	2	3			1	1	1	1		1		1	1	3
Black Swallowtail	75	10 May	8 Oct										2	2	3	3	5	3	3		1	1	2	8	12	4	4	7	3	3	6		2			1
Canadian Tiger Swallowtail	579	17 May	8 Aug										2	23	41	45	146	98	71	57	48	27	12	6	1	1	1
Giant Swallowtail	4	7 Aug	25 Aug																								2		1	1
Cabbage White	804	8 Apr	12 Nov				1		1	8	4	7	19	31	31	20	24	14	12	19	17	34	34	60	57	39	48	67	62	65	45	24	25	9	11	4	8	1	1		1	1
Mustard White	288	8 Apr	7 Oct				1		3	3	9	10	16	19	21	10	13	9	3	8	20	16	24	20	18	17	9	8	12	12	2	1	2	1			1
Clouded Sulphur	896	3 May	13 Nov								4	4	11	21	20	15	37	20	10	10	26	23	46	62	57	35	30	49	75	63	69	39	54	17	34	25	24	6	4	2	1	1	1
Orange Sulphur	104	10 Jun	13 Nov															1	1		2	1	3	2	4	1	6	6	10	13	9	8	5	4	5	4	9	3	4			2	1
Pink-edged Sulphur	199	11 Jun	14 Sep														3		4	13	22	41	22	35	30	12	9	4		3			1
Little Yellow	0	14 Jun	1 Sep
				March		April					May					June					July					August					Sept					Oct					Nov
Common Name	No.	Earliest	Latest	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
Harvester	74	28 Apr	6 Oct										2	7	2	1	10	5	4		5	4	5	4	6	4	4	5	4	2
American Copper	176	11 May	27 Oct									1		3	2	5	12	5	6	2	6	7		4	6	10	12	10	16	26	13	7	7	3	2	4	3	1	2	1
Bronze Copper	59	20 Jun	7 Oct																1	4	9	4	4	8	3				6	10	4	3	1	1			1
Bog Copper	119	14 Jun	11 Sep															1		7	12	32	23	14	11	5	7	2	1	3		1
Dorcas Copper	11	21 Jul	30 Aug																					1	2		5	2		1
Salt Marsh Copper	54	14 Jul	31 Aug																				4	19	11	9	1	3	5	2
Brown Elfin	89	7 May	27 Jun									4	11	31	13	5	11	7	7
Hoary Elfin	11	22 Apr	30 Jun									2	6	1	2
Henry's Elfin	16	6 May	11 Jun								1		4	4	1	3	3
Eastern Pine Elfin	26	6 May	24 Jun								1	1	4	10	1	4	2	1	2
				March		April					May					June					July					August					Sept					Oct					Nov
Common Name	No.	Earliest	Latest	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
Western Pine Elfin	2	16 May	12 Jun										1				1
Bog Elfin	26	3 May	24 Jun										8	8	3	3	2	1	1
Acadian Hairstreak	5	7 Jul	22 Aug																			3	2
Banded Hairstreak	4	9 Jul	7 Aug																			1	1	1			1
Striped Hairstreak	19	11 Jul	18 Aug																			1	7	6	2	2	1
Gray Hairstreak	3	20 May	26 Aug														1			1										1
Early Hairstreak	0	14 May	19 Jun
Eastern Tailed-Blue	9	16 Jun	4 Sep															1						1				1	2	3	1
Western Tailed-Blue	35	31 May	14 Aug												1	1	3	9	11	2	5	1	1					1
Northern Spring Azure	701	17 Apr	4 Oct					4	3	3	20	20	44	70	65	46	97	58	42	55	50	58	24	17	7	5	5	3	3	2
				March		April					May					June					July					August					Sept					Oct					Nov
Common Name	No.	Earliest	Latest	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
Silvery Blue	275	21 May	24 Jul											5	20	12	60	55	35	30	35	11	8	4
Northern Blue	49	16 Jun	22 Aug															1	1	5	6	12	12	5	2	1	2	1	1
Greenish Blue	0	2 Jun	10 Jul
American Snout	3	1 Jul	9 Aug																		1		1			1
Monarch	220	4 May	25 Oct												1					11	22	28	17	18	10	10	6	11	14	24	1	7	14	6	4	9	2		4	1
Variegated Fritillary	0	1 Jul	1 Jul
Great Spangled Fritillary	406	11 Jun	27 Sep														1			10	29	42	62	59	43	31	38	28	25	17	15	4	1	1
Aphrodite Fritillary	16	29 Jun	5 Sep																	2		2		1	4	2	2	1		2
Atlantis Fritillary	465	7 Jun	5 Oct														1	9	15	23	51	50	37	56	41	32	43	37	25	27	13	5
Bog Fritillary	4	18 Jun	2 Jul															2	1		1
				March		April					May					June					July					August					Sept					Oct					Nov
Common Name	No.	Earliest	Latest	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
Silver-bordered Fritillary	325	19 May	26 Sep											7	12	15	29	37	29	25	15	11	6	3	20	16	32	25	18	17	5		2		1
Meadow Fritillary	18	14 May	14 Sep										2		1					5	1						5			1	1		2
Arctic Fritillary	8	21 Jul	30 Aug																					1	1	3			2	1
Silvery Checkerspot	7	17 Jun	13 Jul																4	2	1
Harris's Checkerspot	154	31 May	28 Jul														2	22	27	37	29	26	4	7
Northern Crescent	655	20 May	2 Oct											1	4	4	25	60	53	89	94	83	65	58	36	11	14	14	11	19	6	4	2		1	1
Baltimore Checkerspot	52	9 Jun	12 Aug															7	6	12	12	7	6	1	1
Common Buckeye	7	24 Jul	29 Sep																					1			1				2	1	1		1
Question Mark	337	25 Apr	24 Oct							1	3	1	8	20	21	11	40	34	19	32	28	32	20	13	10	5	9	8	6	3	5	1	3	1	1		1		1
Eastern Comma	19	4 Apr	24 Oct			1	1		1			2	1		2	1	2								2				1	1			1		2		1
				March		April					May					June					July					August					Sept					Oct					Nov
Common Name	No.	Earliest	Latest	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
Satyr Comma	13	3 Apr	21 Aug			1										1	2	2					1		2		2	1	1
Green Comma	172	2 Apr	8 Oct			6		1	2	1	9	2	10	20	13	4	8	6	4		2		1	5	11	11	8	4	21	9	4	6	1	2	1
Hoary Comma	18	1 May	9 Sep								1			1			2				1			1	1	6			4			1
Gray Comma	93	5 Apr	22 Sep			1				1	6	2	4	5	8	1	11	1	1	4	2	1	4	1	5	4	5	6	11	4	1	2	1	1
Compton Tortoiseshell	9	31 Mar	6 Oct		1	1			4																				1			1				1
Milbert's Tortoiseshell	16	24 Mar	18 Oct			2				1	1						2			1	2	1		1			1		2	1	1
Mourning Cloak	278	21 Mar	10 Nov	1	1	8	2	7	9	6	14	5	13	30	30	9	21	13	7	8	4	3	3	3	3	5	5	5	16	13	9	9	5	4	3	2		1				1
Red Admiral	699	17 Apr	27 Oct					8	9	3	21	17	53	49	39	24	64	44	17	35	29	16	26	28	25	27	25	17	16	16	22	20	26	4	7	6	2	1	1	2
Painted Lady	368	4 May	18 Nov								3	3	7	12	3	5	6	3	2	7	10	20	15	21	16	15	26	24	48	33	17	18	27	3	6	9	1	1	1	2		2	2
American Lady	532	17 Apr	12 Nov					3	3	1	10	12	18	38	18	15	14	5	7	2	10	22	21	32	26	29	40	22	36	32	24	16	21	6	13	11	11	3	7	3		1
				March		April					May					June					July					August					Sept					Oct					Nov
Common Name	No.	Earliest	Latest	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
White Admiral	354	10 Jun	29 Sep															11	28	60	81	49	30	23	8	7	4	12	15	10	8	7			1
Viceroy	323	6 Jun	13 Oct														3	18	19	25	29	13	12	8	13	9	13	38	27	51	21	13	8	1	2
Northern Pearly-Eye	183	22 Jun	15 Sep																	3	34	42	40	30	16	6	4	2	2	2		1	1
Eyed Brown	223	22 Jun	16 Aug																	16	43	56	35	45	22	4	1	1
Little Wood-Satyr	58	4 Jun	20 Jul													2	5	13	11	10	10	3	3	1
Common Ringlet	557	23 May	28 Sep											1	3	10	41	89	78	73	85	41	11	15		2	7	10	16	32	22	10	7	2	2
Maritime Ringlet	3	13 Jul	10 Aug																						1	2
Common Wood-Nymph	461	30 Jun	21 Sep																		1	3	22	56	80	67	62	58	50	37	20	4		1
Jutta Arctic	42	18 May	10 Jul										2	6	9	9	6	5	3	2
In each column, the number of dated records for the species are indicated (for some species there are none, only adult records are shown). Only Maritimes Butterfly Atlas data (2010-2012) was used for these calculations.
Earliest and latest record dates for adults are indicated. These were calculated from the Maritimes Butterfly Atlas dataset, the AC CDC database, and various publications.
Each month has been divided into 5 segments; 'A' is days 1-6; 'B' 7-12; 'C' 13-18; 'D' 19-24; and 'E' is day 25 to the end the month.
The "No." column indicates the number of records for the species submitted to the Maritimes Butterfly Atlas (2010-2012).
The intensity of shading indicates the level of abundance.							= 1 record					= 2-5 records					= 6-10 records					= 11-20 records					= 20+ records