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https://www.gardeningknowhow.com/edible/fruits/fegen/plant-chill-hours.htm#:~:text=Chilling%20hours%20are%20basically%20the%20hours%20between%20the,not%20included%20and%20not%20counted%20as%20chill%20hours.
https://www.groworganic.com/blogs/articles/chill-hours-what-are-they-how-do-i-count-them-and-why-do-my-fruit-trees-car
Here are some guides to low chill (less than 300 hours) fruit trees: Pears – most require over 300 chill hours. Asian pears require the lowest chill hours of all pears. The majority of the fruit and nut trees require higher chill hours.
https://www.gardeningknowhow.com/edible/fruits/fegen/plant-chill-hours.htm
What are Chill Hours? Chilling hours are basically the hours between the temperatures of 34-45 degrees F. (1-7 C.) in autumn that will reach the tree. These are …
https://practicalprimate.com/chill-hours/
Fruit and nut trees that require a certain amount of chill hours include peaches, plums, apricots, almonds, pecans, pears and apples. I am sure I have missed some. Some of these trees require as little as 50 hours of chill (low chill ‘tropical’ peaches) while others …
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=16468
As stated above, some require more chill hours than others, depending on species and varieties within species. Choosing “low chill” (requiring less than 300 hours at 32°-45°F) will hedge your bets, with the added benefit of getting more for your water …
https://etweather.tamu.edu/chill/
Method 1: Chilling hours were calculated by counting the number of hours between 32 and 45 degrees F, from October 1st through February 28th/29th. Method 2: Chilling hours were calculated by counting the number of hours at or below 45 degrees F, from October 1st through February 28th/29th. Historical Date of First and Last Frost and Chilling Hour Data: Season: Date of First Frost
https://www.plantmegreen.com/pages/plant-hardiness-zones-and-chill-hours
Chill Hours (sometimes called Chill Units) are an approximation of how many hours of weather between 32 degrees and 45 degrees (F) a plant requires to properly go dormant so it can wake up and blossom and/or set fruit. Notice, it is not the amount of time the temperature is below freezing.
http://www.gardenality.com/Articles/1055/Resources/Calculators-and-Charts/Chill-Hours-Map-Chart-For-United-States/default.html
What are chill hours? In order to bloom in spring and then produce fruit, deciduous fruit trees such as peaches, plums, and nectarines, and some varieties of berry bushes, such as blueberries, require a dormancy period during winter with a certain number of chilling hours; when the temperature drops below 45 degrees Fahrenheit.
https://www.davewilson.com/home-garden/fruit-variety-recommendations/fruit-tree-chilling-requirement/
COLD CLIMATES. Varieties adapted to colder climates usually, but not always, have chilling requirements of 800-1,000 or more hours. In the coldest fruit tree climates, though, growers are little concerned with chilling requirements; almost all varieties receive their chilling requirement early in winter.
https://www.fruitionseeds.com/learn/blog/fruitions-trees-why-we-resist-shipping-everywhere/
Chill Hours. Areas in warmer locations need to assess if their area has enough ‘chill hours’ to meet the requirement of a particular variety. Chill hours, also called ‘chill units’ are the number of hours a fruit tree spends between above freezing and lower than 45 degrees F, 7 degrees C, before it begins to break out of dormancy.
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