Youngtown, AZ 85345 Frost Dates
When can you plant in Youngtown, AZ?
Around 01/20 is the usual last spring frost, about 145 days away. The first fall frost typically arrives around 12/15, about 331 frost-free days later.
Youngtown sits in USDA Zone 9b (25 to 30°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 16 weeks of growing season left in Youngtown before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Youngtown's last frost
01/20 is the middle of 30 years of NOAA records, not a promise. Plant by 02/18 and you're betting against frost in roughly 9 years out of 10. 12/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Youngtown compares
Youngtown's growing season runs about 331 days, ranking 2,947 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 176 of 506.
Learn more
local microclimates covers what one yard in Youngtown can differ from the 85345 normal. zone vs. frost date covers why Zone 9b and Youngtown's frost date answer different questions.