Portland, AR 71663 Frost Dates
Frost dates for Portland, AR, ZIP 71663
The last spring frost here typically falls around 03/14, about 198 days from today. The first fall frost typically arrives around 11/10, about 241 frost-free days later.
The USDA Plant Hardiness Zone Map puts Portland in Zone 8b (15 to 20°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 8b around Portland has about 11 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 03/14 isn't a guarantee
03/14 is the middle of 30 years of NOAA records, not a promise. Plant by 02/25 and you're betting against frost in roughly 9 years out of 10. 04/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Portland compares
At roughly 241 frost-free days, Portland places 8,627 of 40,283 ZIP codes in this dataset. Within AR, it ranks 82 of 687.
Learn more
local microclimates explains what one yard in Portland can differ from the 71663 normal, and zone vs. frost date explains why Zone 8b and Portland's frost date answer different questions.