Portland, TX 78402 Frost Dates
Portland, TX: when does the frost end?
Around 01/28 is the usual last spring frost, about 153 days away. 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.
How much risk comes with planting early here
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 2,931 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 117 of 2,558.
Learn more
Before leaning on 78402's figures: the frost range explains how to read the range around Portland's dates instead of trusting one, while local microclimates explains what one yard in Portland can differ from the 78402 normal.