Here are several maps that I use and recommend others use to check for first and last frost, hardiness zones and other neat things. Remember these are just a guide and please don't blame me for dead gardens.
plant hardiness zone map
find your zone by zip code
heat zone map with how to use instructions
http://www.ahs.org/publications/heat_zone_map.htm
http://www.ahs.org/pdfs/05_heat_map.pdf
Canada hardiness zone map
Europe hardiness zone map
Australia hardiness zone map
average fall frost dates US and Canada
last spring frost map for US and Canada
Something else to think about when it comes to planting beside hardiness zones and frost dates is soil temperature. I often go by this rather than the freeze dates. It does require you keep a careful eye on frost dates but over all this method seems to make more sense than the others.
soil temperature chart
another chart
Still another thing to take in to consideration is the lunar phase and some even take zodiac signs in to consideration. I try to use the moon phases here but I have noticed that often times our window to get things in the ground closes or opens during the non optimal moon phase. No matter it is still interesting and is neat to look at.
moon phases
zodiac signs
lunar planting
plant hardiness zone map
find your zone by zip code
heat zone map with how to use instructions
http://www.ahs.org/publications/heat_zone_map.htm
http://www.ahs.org/pdfs/05_heat_map.pdf
Canada hardiness zone map
Europe hardiness zone map
Australia hardiness zone map
average fall frost dates US and Canada
last spring frost map for US and Canada
Something else to think about when it comes to planting beside hardiness zones and frost dates is soil temperature. I often go by this rather than the freeze dates. It does require you keep a careful eye on frost dates but over all this method seems to make more sense than the others.
soil temperature chart
another chart
Still another thing to take in to consideration is the lunar phase and some even take zodiac signs in to consideration. I try to use the moon phases here but I have noticed that often times our window to get things in the ground closes or opens during the non optimal moon phase. No matter it is still interesting and is neat to look at.
moon phases
zodiac signs
lunar planting
Thanks for the links Dilli!
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