Port Arthur, TX 77640 Frost Dates
When can you plant in Port Arthur, TX?
The last spring frost here typically falls around 02/14, about 170 days from today. The first fall frost typically arrives around 12/07, about 301 frost-free days later.
The USDA Plant Hardiness Zone Map puts Port Arthur in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 14 weeks of growing season left in Port Arthur before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
02/14 is the middle of 30 years of NOAA records, not a promise. Plant by 01/17 and you're betting against frost in roughly 9 years out of 10. 03/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Port Arthur compares
About 301 days separate Port Arthur's last and first frost, putting it 3,912 of 40,283 ZIP codes nationally. Within TX, it ranks 296 of 2,558.
Learn more
the frost range covers how to read the range around Port Arthur's dates instead of trusting one. local microclimates covers what one yard in Port Arthur can differ from the 77640 normal.