Port Arthur, TX 77655 Frost Dates
Frost dates for Port Arthur, TX, ZIP 77655
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.
Zone 9b (25 to 30°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 Port Arthur, not a forecast for this year.
What to do before the first frost
Zone 9b around Port Arthur has about 14 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Port Arthur's last frost
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
Port Arthur's growing season runs about 301 days, ranking 3,913 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 297 of 2,558.
Learn more
local microclimates explains what one yard in Port Arthur can differ from the 77655 normal, and zone vs. frost date explains why Zone 9b and Port Arthur's frost date answer different questions.