Calvert, TX 77837 Frost Dates
Calvert, TX: when does the frost end?
The last spring frost here typically falls around 03/21, about 205 days from today. Fall's first freeze usually shows up around 11/09, roughly 234 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Calvert in Zone 9a (20 to 25°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 Calvert'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 02/27 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.
Calvert against the rest of the dataset
Calvert's growing season runs about 234 days, ranking 9,780 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 2,065 of 2,558.
Learn more
Before leaning on 77837's figures: the frost range explains how to read the range around Calvert's dates instead of trusting one, while local microclimates explains what one yard in Calvert can differ from the 77837 normal.