Last year I had plants outside from mid may till beginning of October.
I think you'd be fine with a 6-8wk strain, but the end of the season may be cold and wet so be prepared to deal with that or pull early. Or get a quicker finishing strain lol
My plants started flowering around August 12th I believe, and they finished about two months later... Last year was cold and wet for the end of September and into October, but I kept the girls out as long as possible. They even stayed out past the frost to no detriment.
This year I'm doing the same thing. They'll stay out till they finish or I pull them.
I'm excited for this Frisian Dew outdoor this year, and I'd love to get some GG#4 outside like I did last year.
I'm in Southern Michigan.
HTH