Portland, TX 78468 Frost Dates
Portland, TX: when does the frost end?
Typically, the last spring freeze lands around 01/28, roughly 153 days out. Fall's first freeze usually shows up around 12/21, roughly 331 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 16 weeks until Portland's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Portland's last frost
01/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/16 and only about 1 year in 10 sees frost after that.
Portland against the rest of the dataset
Portland's growing season runs about 331 days, ranking 2,942 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 128 of 2,558.
Learn more
Before leaning on 78468's figures: local microclimates explains what one yard in Portland can differ from the 78468 normal, while zone vs. frost date explains why Zone 10a and Portland's frost date answer different questions.