We’ve just moved to a 5 1/2 acre hobby farm in Rockford, Mn and plan to put in some Pears and Apples in the Spring. I have a large Pole Barn with a side Wall that faces due South on a South facing slope. It should be ideal to back a trellis for espaliered Pears or Apples. My question is … “Will this type of environment give me the benefits of a Zone 5 Tree type or is the Winter hardiness more related to absolute overnight low temp as against daylight warmth?” I’d like to put in either a Bartlett or a Bosc, but dont want to invest time and attention on a espaliered tree that gets killed by the first true Minnesota winter. Thanks, Bill Heussler