Youngtown, AZ 85381 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.
The USDA Plant Hardiness Zone Map puts Youngtown in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's 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.
Why 01/20 isn't a guarantee
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
About 331 days separate Youngtown's last and first frost, putting it 2,951 of 40,283 ZIP codes nationally. Within AZ, it ranks 180 of 506.
Learn more
zone vs. frost date covers why Zone 9b and Youngtown's frost date answer different questions. the frost range covers how to read the range around Youngtown's dates instead of trusting one.