I’m sure they’re dormant so they should be pretty hardy. If I remember from years ago these “gift” trees aren’t very big. You could certainly temporarily plant them in pots and keep them in a cool place until you are ready to get them in the ground. You could even plant multiple ones together for a bit just to hold them over. Give them a bit of water but don’t let them think it is time to sprout and begin to grow. The reality is once you plant them they’re going to be exposed to temperature extremes anyway.
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