When are my girls going to flower?!

So I have a few heady plants going outdoors in NH. They are over 3 months old now in 6 gallon containers, and are almost 6 feet tall!

I know the flowering period takes about 8-9 weeks, so when should expect to see some serious bud forming?

I am just worried because the plants have defenitelly used up the entire container with the root system and in 8 weeks its going to be October and in NH its gets pretty cold at night.

6'? Boy I hope thats a Sativa. 12/12 lighting is going to trigger flowering not time period in months. I start flowering mine about a 1.5 feet 2 tops. Is it still in 18 hour photo period?

Well the plants are outdoors in a little field. Like a month ago, we had like 3 weeks of cold weather and rain, so I saw some pre-flowers and thats how I knew that they were all female. But then the 80 degree weather came back and the pre-flowers went brown and the plants went back into veg. So now i guess im just wondering when the flowering process is gonna start again and the white hairs are gonna start growing again.