I'm in Vermont and mine started to flower around August 15th. Giving them about 8 weeks i'd say I will be harvesting them around October 10th. Obviously there will be a lot of factors to influence this, so they may go longer or maybe be ready early. Generaly though, its late September early November when you harvest up here. I've seen some sativas go way later though and they had to be covered up to protect from frost/snow. Hope that helped some.