Sonora, TX 76943 Frost Dates
Sonora, TX: when does the frost end?
Around 03/21 is the usual last spring frost, about 205 days away. Fall's first freeze usually shows up around 11/06, roughly 227 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Sonora in Zone 8a (10 to 15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 10 weeks until Sonora's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/21 isn't a guarantee
03/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/12 and only about 1 year in 10 sees frost after that.
Sonora against the rest of the dataset
About 227 days separate Sonora's last and first frost, putting it 11,018 of 40,283 ZIP codes nationally. Within TX, it ranks 2,218 of 2,558.
Learn more
Before leaning on 76943's figures: local microclimates explains what one yard in Sonora can differ from the 76943 normal, while zone vs. frost date explains why Zone 8a and Sonora's frost date answer different questions.