Cibolo, TX 78108 Frost Dates
Frost dates for Cibolo, TX, ZIP 78108
Typically, the last spring freeze lands around 02/21, roughly 177 days out. The first fall frost typically arrives around 12/05, about 289 frost-free days later.
The USDA Plant Hardiness Zone Map puts Cibolo in Zone 9a (20 to 25°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 9a around Cibolo has about 14 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 02/21 isn't a guarantee
02/21 is the middle of 30 years of NOAA records, not a promise. Plant by 01/10 and you're betting against frost in roughly 9 years out of 10. 03/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cibolo compares
Cibolo's growing season runs about 289 days, ranking 4,539 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 669 of 2,558.
Learn more
local microclimates explains what one yard in Cibolo can differ from the 78108 normal, and zone vs. frost date explains why Zone 9a and Cibolo's frost date answer different questions.