Chilling Hours Maps - October 1 Start
Go to maps with September 1 start date | Click map for large version.
Many plants become dormant during the cool season. If the cool season is not cool enough for a long enough period, many fruit-producing plants have a difficult time knowing when to overcome dormancy. Like growing degree-day units that are used to track temperature differences over a certain threshold over a period of time, chilling hours offer a way to track length of exposure to optimum dormancy temperatures. Maps of accumulated and chilling hours and chilling hours departure have been developed for growers to monitor the number of chilling hours over a dormant season based upon popular chilling temperature ranges. For more information, see our "About Chilling Hours Product" page.
|Apple||400-1000 (low-chill varieties are less)||Peach||600-800|
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