Choose the Best Regional Version of the Gardening by the Moon
To select the best regional version for your local climate, you should know your average frost free dates. Remember, average means that frost will occur up to fifty percent of the time before or after this date. It is not the last possible date of frost.
Frost is also effected by the proximity of water, wind shelter, altitude, and microclimates. A stone wall or nearby pavement can create a warm bubble, and a perennially shady spot (like a conifer grove) could be in a colder zone than the rest of your garden.
These are the approximate areas recommended for each of our different versions. Extremes of altitude, temperature or humidity may require some adjustments of planting dates.