Houston, TX 77522 Frost Dates
Houston, TX: when does the frost end?
Typically, the last spring freeze lands around 02/13, roughly 169 days out. Fall's first freeze usually shows up around 12/09, roughly 300 days after the last spring frost.
Houston sits in USDA Zone 9b (25 to 30°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 15 weeks until Houston's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 02/13 isn't a guarantee
02/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/12 and only about 1 year in 10 sees frost after that.
Houston against the rest of the dataset
About 300 days separate Houston's last and first frost, putting it 4,084 of 40,283 ZIP codes nationally. Within TX, it ranks 416 of 2,558.
Learn more
Before leaning on 77522's figures: local microclimates explains what one yard in Houston can differ from the 77522 normal, while zone vs. frost date explains why Zone 9b and Houston's frost date answer different questions.