Shamrock, TX 79079 Frost Dates
Frost dates for Shamrock, TX, ZIP 79079
Around 04/10 is the usual last spring frost, about 225 days away. The first fall frost typically arrives around 10/30, about 201 frost-free days later.
Shamrock sits in USDA Zone 7b (5 to 10°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 7b around Shamrock 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.
How much risk comes with planting early here
04/10 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. 04/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Shamrock compares
About 201 days separate Shamrock's last and first frost, putting it 17,539 of 40,283 ZIP codes nationally. Within TX, it ranks 2,433 of 2,558.
Learn more
zone vs. frost date explains why Zone 7b and Shamrock's frost date answer different questions, and the frost range explains how to read the range around Shamrock's dates instead of trusting one.