I'm in northern New England, 45º long. Most cannabis starts flowering in August. If you started healthy seedlings before June first and got them in the ground for a decent chance to veg you could do alright. They keep growing in bloom and they finish in October or later.
I have seedlings not in the ground yet. Some are a couple of weeks old and some are a couple of days old, they are in party cups.
I've started really early before and I think maybe it takes longer for those plants to start flowering. It sure seemed so. So I'm going to see how this works out.