Oro Valley, AZ 85704 Frost Dates
Oro Valley, AZ: when does the frost end?
Around 02/26 is the usual last spring frost, about 182 days away. Fall's first freeze usually shows up around 12/04, roughly 279 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Oro Valley in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 14 weeks until Oro Valley'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
02/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/18 and only about 1 year in 10 sees frost after that.
Oro Valley against the rest of the dataset
At roughly 279 frost-free days, Oro Valley places 4,861 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 292 of 506.
Learn more
Before leaning on 85704's figures: zone vs. frost date explains why Zone 9a and Oro Valley's frost date answer different questions, while the frost range explains how to read the range around Oro Valley's dates instead of trusting one.