Lots of variables here to be considered. I believe where you need to start is what is the date of your first frost? You can go to the weather bureau and find this online I am sure. Then figure out how long your strain takes to go through flower, add a couple of weeks to this date at least. This is the time to set your plants out.
Of course this is a brief explaination of things to consider but it should give you a better idea of when to set your plants out. Next year you will be able to plant better so that your plants are at the size you desire when you set them out. I wish you the best of luck with your grow.