Holbrook, AZ 86502 Frost Dates
When can you plant in Holbrook, AZ?
Around 05/22 is the usual last spring frost, about 267 days away. The first fall frost typically arrives around 10/08, about 138 frost-free days later.
Zone 7a (0 to 5°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 Holbrook, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Holbrook before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/22 isn't a guarantee
05/22 is the middle of 30 years of NOAA records, not a promise. Plant by 05/05 and you're betting against frost in roughly 9 years out of 10. 06/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Holbrook compares
Holbrook's growing season runs about 138 days, ranking 37,379 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 481 of 506.
Learn more
local microclimates covers what one yard in Holbrook can differ from the 86502 normal. zone vs. frost date covers why Zone 7a and Holbrook's frost date answer different questions.