Fruit trees require a certain period of dormancy and chilling in order to properly fruit the next year.  So, certain varieties are more suitable for areas where the winters are "warmer" while others can only perform well where the winters are much colder and longer.

There often is insufficient data on each variety's requirements, so if you cannot find a particular variety on these charts, you can usually make an educated guess by using the hardiness zones that are posted in each varieties description.  

Stay within the hardiness zones and you usually will meet the varieties chilling requirements.
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