Moreno Valley, CA 92518 Frost Dates
92518, near Moreno Valley, CA: the frost window
Typically, the last spring freeze lands around 01/10, roughly 135 days out. Fall's first freeze usually shows up around 01/02, roughly 365 days after the last spring frost.
Moreno Valley sits in USDA Zone 9b (25 to 30°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.
Stretching the season past the first frost
Moreno Valley's growing season runs out in roughly 18 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 01/10 isn't a guarantee
01/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/20 and only about 1 year in 10 sees frost after that.
Moreno Valley against the rest of the dataset
Moreno Valley's growing season runs about 365 days, ranking 350 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 113 of 2,555.
Learn more
Two guides worth reading on 92518: zone vs. frost date, on why Zone 9b and Moreno Valley's frost date answer different questions, and the frost range, on how to read the range around Moreno Valley's dates instead of trusting one.