My advice would be to get some seeds online and start them indoors ASAP. If your not looking for monster plants you still have lots of time, but definitely go with something with a short flowering time, indica dominant, and a proven track record for growing in Northern climates. Don't trust all websites with finishing times as these are approximate and are recorded in more favorable conditions. Read as many strain reviews as you can, and you will be one up on everyone growing in your area. Grow journals are a life saver too if you find some that take place within your area, you can learn a lot from others mistakes.