Riverside, TX 77320 Frost Dates
Frost dates for Riverside, TX, ZIP 77320
Typically, the last spring freeze lands around 03/02, roughly 186 days out. The first fall frost typically arrives around 11/26, about 272 frost-free days later.
Riverside sits in USDA Zone 9a (20 to 25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 9a around Riverside has about 13 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
03/02 is the middle of 30 years of NOAA records, not a promise. Plant by 01/31 and you're betting against frost in roughly 9 years out of 10. 03/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Riverside compares
Riverside's growing season runs about 272 days, ranking 5,400 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 1,001 of 2,558.
Learn more
zone vs. frost date explains why Zone 9a and Riverside's frost date answer different questions, and the frost range explains how to read the range around Riverside's dates instead of trusting one.