I'm located in 49047 and grow tridents in the ground. I also grow them in training pots, squat pots, and nursery cans, and leave them sitting on the ground with no protection during winter. We get a lot of snow and snow insulates the pots/roots, maintaining a pretty constant temperature. Your biggest enemies are strong, drying winds and constant freeze/thaw cycles. Snow load is another factor to consider once you have structure and branching in place. Lastly, you will get browsed by animals.
Seedlings are inexpensive so you really have very little to lose. Experiment and have fun doing it.