Houston, TX 77233 Frost Dates
Frost dates for Houston, TX, ZIP 77233
Around 02/13 is the usual last spring frost, about 169 days away. The first fall frost typically arrives around 12/09, about 300 frost-free days later.
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.
What to do before the first frost
Zone 9b around Houston has about 15 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
02/13 is the middle of 30 years of NOAA records, not a promise. Plant by 01/12 and you're betting against frost in roughly 9 years out of 10. 03/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Houston compares
Houston's growing season runs about 300 days, ranking 4,020 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 352 of 2,558.
Learn more
the frost range explains how to read the range around Houston's dates instead of trusting one, and local microclimates explains what one yard in Houston can differ from the 77233 normal.