Portland, TX 78463 Frost Dates
Frost dates for Portland, TX, ZIP 78463
The last spring frost here typically falls around 01/28, about 153 days from today. The first fall frost typically arrives around 12/21, about 331 frost-free days later.
Portland sits in USDA Zone 10a (30 to 35°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 10a around Portland has about 16 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.
Why 01/28 isn't a guarantee
01/28 is the middle of 30 years of NOAA records, not a promise. Plant by 02/28 and you're betting against frost in roughly 9 years out of 10. 12/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Portland compares
At roughly 331 frost-free days, Portland places 2,938 of 40,283 ZIP codes in this dataset. Within TX, it ranks 124 of 2,558.
Learn more
local microclimates explains what one yard in Portland can differ from the 78463 normal, and zone vs. frost date explains why Zone 10a and Portland's frost date answer different questions.