Frost Dates for 86025 — Holbrook, Arizona

Half of springs at Holbrook, AZ see their last 32°F night by April 22; only one in ten is past it by April 8, and one in ten still has one after May 7. Planting tender crops after April 29 leaves a 30% risk of a frost on them, after May 2 20%, and after May 7 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 91% of the 98 Arizona stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 24 in half of years, as early as October 12 one year in ten, and holds off past November 5 one year in ten. A hard freeze of 28°F follows 9 days later, around November 2; in spring the one-in-ten date for 28°F is April 22, 15 days before the 32°F one. The freeze-free season lasts 184 days in a typical year, shorter than at 73% of the 98 Arizona stations; it reaches 203 days one year in ten and falls short of 164 one year in ten. On average 137 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 12 days longer, to about May 4, and return around October 15. Severe cold of 16°F or below comes every winter, usually between December 1 and February 19.

July is the warmest month at Holbrook, AZ, averaging 94°F by day and 62°F at night; December is the coldest at 50°F and 22°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 24% of years.

Warmth for growing adds up to 3,920 growing degree days a year (base 50°F), fewer than at 74% of the 102 Arizona stations. 34% of them (1,351) have built up by the end of June, and July adds the most, 876. Precipitation totals 8.2 inches a year, most in August (1.7") and least in April (0.3"); May to September bring 55% of it.

The nearest other station, Snowflake, AZ, 30 miles south of Holbrook and 557 feet higher, has a last frost 19 days later (May 11), a first frost 14 days earlier (October 10), a season 35 days shorter.

The first measurable snow (0.1 inch or more) in Holbrook usually arrives around November 30, and the last of the season around March 28. Those are the middle dates across the winters of 1991–2020 at Holbrook, AZ, 1.9 miles away: half of years saw snow earlier, half later. Snow fell in 55% of those winters. The last 32°F night of spring typically comes 25 days after the last snow.

ZIP 86025 is 2 miles from Holbrook, AZ, which stands at 5,085 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 86025 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.