Holbrook, AZ 85942 Frost Dates
Holbrook, AZ: when does the frost end?
Around 05/04 is the usual last spring frost, about 249 days away. Fall's first freeze usually shows up around 10/16, roughly 162 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Holbrook in Zone 7a (0 to 5°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 7 weeks until Holbrook'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
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Holbrook against the rest of the dataset
At roughly 162 frost-free days, Holbrook places 31,717 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 453 of 506.
Learn more
Before leaning on 85942's figures: local microclimates explains what one yard in Holbrook can differ from the 85942 normal, while zone vs. frost date explains why Zone 7a and Holbrook's frost date answer different questions.