Portland, TX 78416 Frost Dates
Frost dates for Portland, TX, ZIP 78416
Around 01/15 is the usual last spring frost, about 140 days away. The first fall frost typically arrives around 12/30, about 353 frost-free days later.
The USDA Plant Hardiness Zone Map puts Portland in Zone 10a (30 to 35°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
Zone 10a around Portland has about 18 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.
How much risk comes with planting early here
01/15 is the middle of 30 years of NOAA records, not a promise. Plant by 02/23 and you're betting against frost in roughly 9 years out of 10. 12/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Portland compares
About 353 days separate Portland's last and first frost, putting it 2,232 of 40,283 ZIP codes nationally. Within TX, it ranks 72 of 2,558.
Learn more
the frost range explains how to read the range around Portland's dates instead of trusting one, and local microclimates explains what one yard in Portland can differ from the 78416 normal.