Jurupa Valley, CA 92509 Frost Dates
Frost dates for Jurupa Valley, CA, ZIP 92509
The last spring frost here typically falls around 01/09, about 134 days from today. The first fall frost typically arrives around 12/30, about 362 frost-free days later.
Jurupa Valley sits in USDA Zone 10a (30 to 35°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 10a around Jurupa Valley 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.
Why 01/09 isn't a guarantee
01/09 is the middle of 30 years of NOAA records, not a promise. Plant by 02/21 and you're betting against frost in roughly 9 years out of 10. 12/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Jurupa Valley compares
Jurupa Valley's growing season runs about 362 days, ranking 2,062 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 948 of 2,555.
Learn more
zone vs. frost date explains why Zone 10a and Jurupa Valley's frost date answer different questions, and the frost range explains how to read the range around Jurupa Valley's dates instead of trusting one.