Portland, TX 78403 Frost Dates
When can you plant in Portland, TX?
Around 01/28 is the usual last spring frost, about 153 days away. The first fall frost typically arrives around 12/21, about 331 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
About 16 weeks of growing season left in Portland before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Portland's last frost
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 2,932 of 40,283 ZIP codes in this dataset. Within TX, it ranks 118 of 2,558.
Learn more
local microclimates covers what one yard in Portland can differ from the 78403 normal. zone vs. frost date covers why Zone 10a and Portland's frost date answer different questions.