when do you go into fall run mode?

[Cool Beans]

The trick is in the spring, to keep on fishing through summer and into fall. That way, you will never miss whatever run is happening. Only stop fishing when the water starts to freeze in the eyes of your pole.

[FishermanTim]

Sept is the "transitional" period for me.
I move from freshwater bass to salt, and prep some gear for the true fall trout, and then get the ice gear tuned up. Wait a sec, I'm getting ahead of myself. Summer (for me) doesn't end until all the leaves have fallen or the first "true" frost/freeze.
I love cool weather, so fall is just a cooler part of summer.

[Rockfish9]

being farther north than most of you, things tend to blend here, each season blends into the next and brings it's own rules.... by the last week of August I see fish schooling in big pods...the beach front will host pockets of "blitz" type fishing for two or three days and then it's dead for a few more, the river fishing is the same, fish will come in and feed for one or two tides and leave ( to be found out on the front beach) the last 10 days were scratch and claw...last night was blitz... and so it will go for the next three weeks... then it will be very sparodic.... to answere the question directly.. I never change what I do.. just the methods I use and locations I fish.. and that is as often as possible.. usualy 3-4 nights a week...One thing does change.. t shirts and bug spray have been replaced with gloves and sweat shirts...