frost and freeze dates
What time frame is used to determine the average first/last frost and freeze dates for a region? Is this ever updated? What information is used to determine the dates for rural areas that don't have a local weather station?
Frio County Texas
For Frio County:
Average date of Last spring frost is Feb. 14th
Average date of first fall frost is Dec 16th
You can go to aggie-horticulture.tamu.edu or agrilifebookstore.org and print out the publication 'Texas Home Vegetable Gardening Guide" that publishes the freeze dates.