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Below is a basic climate zone map and minimum temperatures table for the United States. Canadian customers can determine their zone from the temperatures table or by viewing the Agi-Canada's Zone map.

Please note that we have indicated the coldest zone the tree will normally flourish in after each tree variety listed on our seed catalog page. If you live in a colder zone than that listed for the tree seed you are interested in you should be aware of the fact that small pockets of warmer zones often exist within your zone-these are called "micro-climates" and can be used to advantage-they are often warmer by one full zone. They occur for a number of reasons. Your garden may be sheltered by a hill (or even large trees) from the prevailing winds, you may be situated on a south facing hill or be influenced by the moderating effects of a large body of water close by. If your garden is in a town or city you should find average temperatures to be usually warmer by quite a few degrees than the surrounding countryside. These considerations can help when determining what trees you may have success with in your garden when contemplating a borderline hardy variety.

 
A note on zones: If, for instance, a variety is listed as being cold hardy to Z 4 (the coldest zone in which it will normally flourish) than generally speaking it can also be grown successfully in the next few warmer zones. However, success in zones that are more extreme in their climate such as the more extreme parts of Zones 8,  9 and 10 often require you to provide extra consideration whereby extremes in drought and heat can be reduced or ameliorated by extra waterings, judicial placement for exposure, partial shade provision, soil mulching for longer moisture retention and protection from heat, the amending of soils with organic matter for tilth and better moisture retention (always a good measure anyway), etc. Extra care in the more extreme zones is sometimes better provided for by growing the tree in a large pot or garden tub where it can be moved at will and situated for better effect or protection, etc.