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That depends on where you live. Near the Canadian border they may hang around all summer, particlarly if it's a cool, wet summer. The further south you go, the shorter the black fly season. In the areas where the season is the shortest, they can persist a few weeks. Again, it depends on how quickly it warms up and how dry the spring is.
What else can I help you with?
How long do house fires last?
How long do house flies live
How long did black codes last?
black code lasted atleast a year
How long do black cd's last?
A black cd will last just as long as any other regular cd, however Sony's lazer's are calibrated for the different refraction the black cd's will emit.
How long did black death last?
until 1350
How long does black mucus last?
1 day
How long do the effects of the White and Black Flutes last?
They will last as long as you stay in the route apparently using White then Black will negate the effect of the White flute while using Black then White will negate the Black flutes effect.
How long does a black hole last for?
It lasts until evaporated.
How long does the signal last on the black box?
on million year
How long did the black Friday bushfires last?
actually never
How long did the rebellion in the black death last?
what are the advantages of computer
How long do black olives last in the fridge before they spoil?
Black olives can last in the fridge for about 2 to 3 weeks before they spoil.
How long does the Indian treaty last with the Lakota?
if you are referring to the Fort Laramie treaty of 1851, "As long as the river flows and the eagle flies." -- Rabbit if your'e referring to the later Black Hills Fort Laramie treaty of 1868 ,"as long as the river flows and the grass grows"
