Round Rock, TX 78681 Frost Dates
When can you plant in Round Rock, TX?
Typically, the last spring freeze lands around 03/11, roughly 195 days out. The first fall frost typically arrives around 11/20, about 254 frost-free days later.
The USDA Plant Hardiness Zone Map puts Round Rock 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
About 12 weeks of growing season left in Round Rock before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Round Rock's last frost
03/11 is the middle of 30 years of NOAA records, not a promise. Plant by 02/22 and you're betting against frost in roughly 9 years out of 10. 03/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Round Rock compares
Round Rock's growing season runs about 254 days, ranking 6,985 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 1,513 of 2,558.
Learn more
the frost range covers how to read the range around Round Rock's dates instead of trusting one. local microclimates covers what one yard in Round Rock can differ from the 78681 normal.