Port Aransas, TX 78373 Frost Dates
78373, near Port Aransas, TX: the frost window
Typically, the last spring freeze lands around 01/16, roughly 141 days out. Fall's first freeze usually shows up around 01/05, roughly 365 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Port Aransas in Zone 10a (30 to 35°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
Port Aransas's growing season runs out in roughly 19 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 01/16 isn't a guarantee
01/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/19 and only about 1 year in 10 sees frost after that.
Port Aransas against the rest of the dataset
At roughly 365 frost-free days, Port Aransas places 1,911 of 40,283 ZIP codes in this dataset. Within TX, it ranks 40 of 2,558.
Learn more
Two guides worth reading on 78373: the frost range, on how to read the range around Port Aransas's dates instead of trusting one, and local microclimates, on what one yard in Port Aransas can differ from the 78373 normal.