Petersburg, TX 79250 Frost Dates
Frost dates for Petersburg, TX, ZIP 79250
Typically, the last spring freeze lands around 04/09, roughly 224 days out. The first fall frost typically arrives around 11/01, about 204 frost-free days later.
The USDA Plant Hardiness Zone Map puts Petersburg in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7b around Petersburg has about 9 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.
Why 04/09 isn't a guarantee
04/09 is the middle of 30 years of NOAA records, not a promise. Plant by 03/24 and you're betting against frost in roughly 9 years out of 10. 04/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Petersburg compares
At roughly 204 frost-free days, Petersburg places 16,677 of 40,283 ZIP codes in this dataset. Within TX, it ranks 2,430 of 2,558.
Learn more
zone vs. frost date explains why Zone 7b and Petersburg's frost date answer different questions, and the frost range explains how to read the range around Petersburg's dates instead of trusting one.