I got relatives up in Rhinelander , had a cabin north of their on muskie bay , went up every year , Beautiful up there , but yep snow in June before . Try 3 or 5 gallon pots , and yes as Austin87 said start indoors around jan. you'll be fine ,
Last two years i've boiled a pot of water, filled a 5 gal bucket with soil and dumped the water in and put a lid on for a bit. Kills everything in the soil... probably all the good stuff too but don't get any gnats.
buts o.k. if we kill the good stuff , it gives a total control what to feed them right from the start till the end ,