O'Brien, TX 79539 Frost Dates
When can you plant in O'Brien, TX?
The last spring frost here typically falls around 03/26, about 210 days from today. The first fall frost typically arrives around 11/11, about 232 frost-free days later.
Zone 8a (10 to 15°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 O'Brien, not a forecast for this year.
What to do before the first frost
About 11 weeks of growing season left in O'Brien before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around O'Brien's last frost
03/26 is the middle of 30 years of NOAA records, not a promise. Plant by 03/01 and you're betting against frost in roughly 9 years out of 10. 04/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How O'Brien compares
O'Brien's growing season runs about 232 days, ranking 10,079 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 2,124 of 2,558.
Learn more
the frost range covers how to read the range around O'Brien's dates instead of trusting one. local microclimates covers what one yard in O'Brien can differ from the 79539 normal.