Grover Beach, CA 93445 Frost Dates
Frost dates for Grover Beach, CA, ZIP 93445
Around 02/01 is the usual last spring frost, about 157 days away. The first fall frost typically arrives around 01/04, about 362 frost-free days later.
The USDA Plant Hardiness Zone Map puts Grover Beach in Zone 10a (30 to 35°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 10a around Grover Beach 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
02/01 is the middle of 30 years of NOAA records, not a promise. Plant by 03/13 and you're betting against frost in roughly 9 years out of 10. 12/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Grover Beach compares
About 362 days separate Grover Beach's last and first frost, putting it 2,076 of 40,283 ZIP codes nationally. Within CA, it ranks 958 of 2,555.
Learn more
zone vs. frost date explains why Zone 10a and Grover Beach's frost date answer different questions, and the frost range explains how to read the range around Grover Beach's dates instead of trusting one.