Portland, TX 78411 Frost Dates
Portland, TX: when does the frost end?
Typically, the last spring freeze lands around 01/15, roughly 140 days out. Fall's first freeze usually shows up around 12/30, roughly 353 days after the last spring frost.
Zone 10a (30 to 35°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Portland, not a forecast for this year.
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.
The actual range around Portland's last frost
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
About 353 days separate Portland's last and first frost, putting it 2,230 of 40,283 ZIP codes nationally. Within TX, it ranks 70 of 2,558.
Learn more
Before leaning on 78411's figures: zone vs. frost date explains why Zone 10a 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.