grannom question

[alatt]

Grannoms started on some streams in pa. My question is how long do they last, and with the temp. next week being only in the high 50's will that effect the hatch.

 

[dryflyguy]

They usually last a week. And once they start, they will keep coming - regardless of the weather conditions. Although cold weather will prolong the hatch some.
But even with the forecast highs in the '50's - which is pretty much normal for this time of year - I would get out to fish them as much as you can now