-Chilling requirement is the number of hours between 32F and 45F, between October 1st  through February 28th, required before a plant starts normal growth in the spring

-Chilling units in Texas vary from 100 hours or fewer in the southern tip of Texas to more than 1,000 hours in the Panhandle
-Different varieties of fruit and nut trees have different chilling requirements. You should purchase varieties of fruit trees that match the chilling hours for your area of Texas. Dallas County on average gets 800 chilling hours. However it can vary from year to year depending on the weather/climate.