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https://virafruits.com/blog/chill-hours#:~:text=Apples%2C%20apricots%2C%20peaches%2C%20cherries%2C%20plums%2C%20and%20nectarines%20are,and%20plants%20produce%20buds%20for%20the%20next%20harvest.
https://virafruits.com/blog/chill-hours
During the dormant period of the year (autumn leaf fall to spring bud break), one hour of cooling equals one chill hour. Studies indicate that fruit trees chill further above 45°F (to about 55°F), are most effective between 35-50°F, and don’t chill below about 30°F.
https://www.groworganic.com/blogs/articles/chill-hours-what-are-they-how-do-i-count-them-and-why-do-my-fruit-trees-car
Asian pears require the lowest chill hours of all pears. Figs, Pomegranates, Quince, Persimmons – all require 300 or less chill hours. Special Hybrids – Spice Zee Nectaplum or Flavor Delight Aprium. The majority of the fruit and nut trees require higher chill hours.
https://harvesttotable.com/fruit-tree-chill-hours/
Low Chill Hours Fruit Trees. If you are unsure of the chill hours where you live, plant a tree with a low chill hours requirement. Here are some fruit trees that need low chill hours: Apples: ‘Dorsett Golden’ (100 hours or less); ‘Fuji’ (200 to 400 hours); ‘Pink Lady’ (200 to 400 hours).
https://www.davewilson.com/home-garden/fruit-variety-recommendations/fruit-tree-chilling-requirement/
Generally, fruit growers have most success with varieties that have stated chilling requirements similar to the chilling typically received at the planting location: “high chill” varieties (800-1,000+ hours) for cold winter climates, “low chill” varieties (500 hours and less) for warm winter climates.
https://www.gardeningknowhow.com/edible/fruits/fegen/plant-chill-hours.htm
Hours when temperatures normally reach 60 degrees F. (15 C.) are not included and not counted as chill hours. Many fruit trees require a time of exposure to temps that are low, but above freezing. These temperatures are required for the trees to perform as we expect them to, like producing flowers that become fruit.
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 may need up to or over 1000 chill hours (some apples and cherries).
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=19305
Effects of Insufficient Chill: With insufficient chill, trees will leaf out late in the season, blossoming can be prolonged, buds may deteriorate and/or drop, and few if any flowers are produced. Without flowers, there is no fruit. Both the absolute number and the distribution of chill hours have an impact.
https://www.plantmegreen.com/pages/plant-hardiness-zones-and-chill-hours
Notice, it is not the amount of time the temperature is below freezing. In fact, any time spent below 32 degrees doesn't count towards chill hours. Some plants, like fruit trees and certain flowers, require a minimum number of chill hours to thrive.
https://extension.oregonstate.edu/gardening/berries-fruit/fruit-tree-site-considerations
Chilling refers to the number of hours below 45ºF that fruit buds need to break dormancy, set fruit and develop fruit. Most deciduous trees require from 200 to 2,000 chilling hours to break dormancy. Temperatures in areas 1 and 2 are cold enough during a normal winter to receive sufficient chilling for all types of deciduous fruit. Soil
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