Mertzon, TX 76939 Frost Dates
Mertzon, TX: when does the frost end?
Typically, the last spring freeze lands around 03/22, roughly 206 days out. Fall's first freeze usually shows up around 11/10, roughly 233 days after the last spring frost.
Zone 8a (10 to 15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Mertzon, not a forecast for this year.
Stretching the season past the first frost
With roughly 11 weeks until Mertzon's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
03/22 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 04/10 and only about 1 year in 10 sees frost after that.
Mertzon against the rest of the dataset
At roughly 233 frost-free days, Mertzon places 9,949 of 40,283 ZIP codes in this dataset. Within TX, it ranks 2,104 of 2,558.
Learn more
Before leaning on 76939's figures: local microclimates explains what one yard in Mertzon can differ from the 76939 normal, while zone vs. frost date explains why Zone 8a and Mertzon's frost date answer different questions.