Larry L wrote:

I've been lucky enough to spend a fairly large amount of time in Idaho and
Montana, over the years, in the times between June1st and Sept 1st.



Larry,

I've never fished Idaho in April. When I was doing most of my fishing
there the season didn't open until the end of May. I guess that has
changed in some places now that have gone to year around fishing.

However, late August and early September are my favorite times to fish
the Teton River and various creeks/cricks in the area. BWO and PMDs can
be very effective, though sometimes you do need to go small. If there
has not been an early hard frost grasshoppers along the banks can still
be effective even into September.

Weather can be unpredictable but is usually nice if not cool, especially
toward the end of September.

Russell

Heck, you could still ice fish in April when I was growing up in Driggs.