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https://www.gardenia.net/plant/prunus-armeniaca-goldcot#:~:text=This%20apricot%20tree%20has%20a%20chill%20hours%20requirement,partners%20to%20increase%20the%20size%20of%20your%20crops.
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=26823
Brief warm spells in winter have a negative effect — temperatures above 70°F for four or more hours offset any chilling that happened in the previous 24-36 hours. Once chilling is complete, the trees prepare to wake up from dormancy and bud after a certain amount of warming takes place.
https://homeguides.sfgate.com/chill-requirements-apricot-trees-57693.html
Apricots Needing 350 to 500 Chill Hours. Two apricot cultivars with only slightly higher chill requirements are “Katy” and “Blenheim.”
https://www.sciencedirect.com/science/article/pii/S0098847207000883
The relationship between hours below 7 °C and chill units is quite high, as well as between hours below 7 °C and portions (R = 0.81 in both cases). This model (hours below 7 °C) is useful for the growers, due to its simplicity, and it proves an indicative value of the dormancy situation, although the accuracy is lower than that of other methods.
https://askthegreengenie.com/fruit-trees/low-chill-apricots/
We are starting with the 'Katy' apricot: it requires only 250 chill hours, is self fertile, and is grafted to Fl-friendly rootstocks like Citation and Nemaguard. Some sources say the chill hours required range between 200-300. Our 2019 crop is on Citation root stock and is growing very robustly, and this following a very mild winter.
https://www.davewilson.com/home-garden/fruit-variety-recommendations/fruit-tree-chilling-requirement/
5. 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 …
https://www.groworganic.com/blogs/articles/chill-hours-what-are-they-how-do-i-count-them-and-why-do-my-fruit-trees-car
How to Count Chill Hours Here's the best way to count chill hours: get someone else to do it! Luckily, there are institutions already tracking this information. Farmers and gardeners in most California counties have access to official data on chill hours through the Pomology Weather Service at the UC Davis Fruit & Nut Research Information Center. This …
https://harvesttotable.com/fruit-tree-chill-hours/
Every fruit tree variety has its own number of hours of chill needed for fruit production. Some fruit trees need as few as 100 chill hours, others need as many as 1,000 chill hours or more. Apples, peaches, and apricots are fruit trees most affected by chill hours.
https://crfg.org/wiki/fruit/apricot-low-chill/
Commercial Potential: This fruit is currently a commercial crop in areas of adequate chill hours. CULTIVARS. Listed in approximate order of maturity. Time of maturity varies year to year. Most data collected from San Diego County, i.e., performance data …
https://ceventura.ucanr.edu/Gardening/Coastal/Veg-Fruit/Chilling/
Chilling hours calculations are only kept between November 1 through March 30. This is the usual dormant season for California. The above temperature perimeters make the calculation of chilling hours a complex process, and accurate temperature records are needed to determine each season’s chilling hours.
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