Delano, CA 93215 Frost Dates
Delano, CA: when does the frost end?
Typically, the last spring freeze lands around 01/31, roughly 156 days out. Fall's first freeze usually shows up around 12/08, roughly 309 days after the last spring frost.
Delano 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
With roughly 15 weeks until Delano's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 01/31 isn't a guarantee
01/31 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/30 and only about 1 year in 10 sees frost after that.
Delano against the rest of the dataset
Delano's growing season runs about 309 days, ranking 3,634 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,485 of 2,555.
Learn more
Before leaning on 93215's figures: zone vs. frost date explains why Zone 9b and Delano's frost date answer different questions, while the frost range explains how to read the range around Delano's dates instead of trusting one.