We collected information about Apple Tree Chill Hours for you. Follow the liks to find out everything about Apple Tree Chill Hours.
https://www.gardeningknowhow.com/edible/fruits/apples/chill-hours-for-apple-trees.htm
Most apple varieties need 500-1,000 chill hours or temps below 45 F. (7 C.) but there are some low chill varieties available that need no more than 300 chill hours. Low chill varieties need less than 700 chill hours and can withstand hotter summers than other varieties.
https://www.orangepippintrees.com/articles/fruit-tree-advice/fruit-tree-minimum-chill-requirement
Most apple varieties have a chill requirement of about 1,000 hours or more, which is readily achieved in the temperate apple-growing regions of the USA, South America, South Africa, Australia, New Zealand, and Europe.
https://askinglot.com/what-are-chill-hours-for-apple-trees
What are chill hours for apple trees? Chill hours or chill units (CU) are the number of hours when temperatures stay at 32-45 F. (0-7 C.). These chill hours are prompted by longer nights and lower temperatures in the fall and early winter. This period of time is critical for apple trees and is when the hormone responsible for dormancy breaks down.
https://harvesttotable.com/fruit-tree-chill-hours/
Apples, peaches, and apricots are fruit trees most affected by chill hours. Apples have the highest chilling requirements of all fruit trees, followed by apricots and, then, peaches. ‘Fuji’ and ‘Gala’ apple varieties require 900 chill hours; ‘Dorset Golden’ apple requires just 100 chill hours.
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-9-10-11/zone-9-apple-trees.htm
With your area’s chill hours in mind, check out these cultivars as potential apple trees for zone 9: “Anna’, ‘Dorsett Golden’, and ‘Tropic Sweet’ are all cultivars with a chilling requirement of only 250 to 300 hours.
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: Apples – Anna, Low Chill multi-graft, Dorsett and Sundowner Apricots – Gold Kist or Katy
https://homeguides.sfgate.com/apple-trees-grow-hot-areas-58537.html
The low-temperature hours don't have to be consecutive. Most apples require 1,000 chill hours or more. However, moderate chill apple varieties require 400 to 700 chill hours, and low-chill ...
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