Worth a try, here the last flight takes place in August so I can grow summer squash and sometimes acorns in late summer- early fall by planting a bout August 15.

Well, I've heard that there are two broods per year in the south. As in, when? If the two are in the spring, I'm home free. (Spring starts here in February, BTW.) If there's one in the spring and one in the fall, we've got a problem.

Here in Middle Georgia , the first invasion is in May, they recycle in July -August. Of July-August the pickle worms are a worst problem. SVBs don't bother moshatas's here but pickle worms do a number on them

OK, I'm probably a month earlier than you on last frost, so I'm guessing that if I have two broods, they are offset a month earlier than you. Just a guess, but worth trying.

OK, I got an "Extension Expert" at TAMU to weigh in on this. Got a lot of useful info.

"Two overlapping generations of squash vine borer occur in the south,
and one—and possibly a partial second—generation occurs in the north,
depending on the accumulated degree days during the growing season.
Larvae feed for approximately 25–27 days (~660 DD50) (Canhilal et al.,
2006) and when fully developed (about 1 inch long), leave the plant
to pupate 1-6 inches deep in the soil. New adults emerge 22–52 days
later in areas where enough heat units accumulate (~745 DD50) (Canhilal
et al., 2006). A second generation of adults could be expected to emerge
around 2430–2680 accumulated DD50."

http://articles.extension.org/pages/65684/biology-and-management-of-squash-vine-borer-in-organic-farming-systems

Whoa. So their life cycles follow degree days, which makes sense, and justifies the comment I made above about "offset dates". Now how do I translate DD50 into dates? Well, there is a cool tool -- http://www.degreedays.net/, where you choose your location, set the "Base temp" to 50F, and select "heating". Then it looks up on WeatherUnderground records and I think gives you number of degrees over 50F (daily high temperature) for each day in an Excel file.

Now, unfortunately, then you have to add all those numbers for each day up (I started adding on January 1) to get "accumulated DD50", and that takes a little effort in Excel. Not hard. Also unfortunately that web tool only does it for the past 20 months, at most. So a seasonal mean is hard to come by. But it looks to me from the 2017 data so far that for me that, for me, second generation adult emergence this year for me should have been mid-June. That would suggest that by mid-July, the danger is gone. That's consistent with my experience. Gosh, first generation should have been early March!

Bottom line. If your season is long enough, and you want to avoid SVBs, you can just wait 'em out. Squash as a fall crop.

Anyone know a better website for degree days?

I found this

http://www.weatherdatadepot.com/

Which will give you monthly sums of cooling degree days for many years. That's the ticket.