Ohio buckeye is an uncommon tree around here but seems

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.