bro ur deff gonna wanna get some cfl's or some other typa lights so u can move ur plants inside and put them on 12/12. by the time ur plants get mature enough to flower by themselfs sept, maybe even oct, i think ull have to short of a flowering period before the temp drops up there and ur plants cant live let alone finish flowerin outside. and ur gonna be left wit pre budd maybe...
how told are they? id let them veg for another 2 weeks maybe and in the mean time get some 2700k cfl's and prepare a flowering room then move them inn there and in AS soon as 8 weeks u maybe be ready to harvest ( dependin on the plants and strain of course).
but thats juss a suggestion remember... im down in the south and i dunno wen u guys up there will get ur first cold fronts come inn...