Somerton, AZ 92222 Frost Dates
Somerton, AZ: when does the frost end?
Typically, the last spring freeze lands around 01/08, roughly 133 days out. Fall's first freeze usually shows up around 12/28, roughly 362 days after the last spring frost.
Zone 10a (30 to 35°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Somerton, not a forecast for this year.
Stretching the season past the first frost
With roughly 17 weeks until Somerton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
01/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/17 and only about 1 year in 10 sees frost after that.
Somerton against the rest of the dataset
Somerton's growing season runs about 362 days, ranking 2,073 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 25 of 506.
Learn more
Before leaning on 92222's figures: local microclimates explains what one yard in Somerton can differ from the 92222 normal, while zone vs. frost date explains why Zone 10a and Somerton's frost date answer different questions.