Ohio buckeye is an uncommon tree around here but seems fully winter hardy in zone 3

Ohio buckeye is an uncommon tree around here but seems fully winter hardy in zone 3. The big compound leaves are so cool. Trying a seedbed of them this summer. Sourcing tree seeds from a similar climate is very challenging, for example my buckeye seeds are from a thousand miles south of here. Will they survive -45? will need to keep them in the seedbed over winter vs heeling them into to find out, i need to see wood above the snow line survive to know.