Butterflies have been fairly well surveyed in some areas of the county. The Lake Dore and the Hog Island Butterfly Counts have been annual for 20 years. A few other enthusiasts have added to the species' lists in their own geographic area and have added rare strays such as Dainty Sulphur and the rare resident, Early Hairstreak.
Some butterflies have two broods, so there will be a late spring flight and another in the fall. Others are only seen in flight for a short period of time in the spring, such as the Eastern Pine Elfin . Still others are migrants such as the Monarch, which produces one brood in the summer and migrates to and overwinters in Mexico.