Hidalgo, TX 78557 Frost Dates
Frost dates for Hidalgo, TX, ZIP 78557
Typically, the last spring freeze lands around 01/09, roughly 134 days out. The first fall frost typically arrives around 01/03, about 365 frost-free days later.
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 Hidalgo, not a forecast for this year.
What to do before the first frost
Zone 10a around Hidalgo has about 18 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
01/09 is the middle of 30 years of NOAA records, not a promise. Plant by 02/13 and you're betting against frost in roughly 9 years out of 10. 12/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hidalgo compares
At roughly 365 frost-free days, Hidalgo places 1,525 of 40,283 ZIP codes in this dataset. Within TX, it ranks 30 of 2,558.
Learn more
the frost range explains how to read the range around Hidalgo's dates instead of trusting one, and local microclimates explains what one yard in Hidalgo can differ from the 78557 normal.