Harlingen, TX 78550 Frost Dates
Harlingen, TX: when does the frost end?
The last spring frost here typically falls around 01/08, about 133 days from today. Fall's first freeze usually shows up around 12/29, roughly 357 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 Harlingen, not a forecast for this year.
Stretching the season past the first frost
With roughly 18 weeks until Harlingen'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
01/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/12 and only about 1 year in 10 sees frost after that.
Harlingen against the rest of the dataset
About 357 days separate Harlingen's last and first frost, putting it 2,085 of 40,283 ZIP codes nationally. Within TX, it ranks 53 of 2,558.
Learn more
Before leaning on 78550's figures: zone vs. frost date explains why Zone 10a and Harlingen's frost date answer different questions, while the frost range explains how to read the range around Harlingen's dates instead of trusting one.