Portland, TX 78415 Frost Dates
Portland, TX: when does the frost end?
The last spring frost here typically falls around 01/15, about 140 days from today. Fall's first freeze usually shows up around 12/30, roughly 353 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Portland in Zone 9b (25 to 30°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 18 weeks until Portland's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 01/15 isn't a guarantee
01/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/11 and only about 1 year in 10 sees frost after that.
Portland against the rest of the dataset
At roughly 353 frost-free days, Portland places 2,231 of 40,283 ZIP codes in this dataset. Within TX, it ranks 71 of 2,558.
Learn more
Before leaning on 78415's figures: zone vs. frost date explains why Zone 9b and Portland's frost date answer different questions, while the frost range explains how to read the range around Portland's dates instead of trusting one.