I'm kidding on the 90 rule.
This has been a cold year. At Carlyle for Muddy waters a week or so ago, the water was in the 60s (I personally tested it - twice) and I think the air was in the low 60s. People were a little uncomfortable with wetsuits.
The "Fall" event would probably have to be in Sept. if held up north.
We used to enjoy sailing late fall best in Nebraska as there would be a few warm days the water had not turned hard yet and we had the water essentialy to ourselves.
Those kind of days were few and far between though, so planning a late event in the North is not practical. I would think early Sept at the latest if up towards WS, and you could get away with mid to later along the mid-atlantic. If it was MS, panhandle, or Atlanta area you might pull off something into Oct without a problem.
I have gotten spoiled though living down here. 140 rule is even a but chilly for me now. When we have to put on a paddling jacket or anything more than my shorts, I start to lose some of my enthusiasm for getting wet.
