Surprise, AZ 85375 Frost Dates
When can you plant in Surprise, AZ?
The last spring frost here typically falls around 01/20, about 145 days from today. The first fall frost typically arrives around 12/15, about 331 frost-free days later.
The USDA Plant Hardiness Zone Map puts Surprise 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 Surprise before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Surprise'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 Surprise compares
Surprise's growing season runs about 331 days, ranking 2,925 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 172 of 506.
Learn more
the frost range covers how to read the range around Surprise's dates instead of trusting one. local microclimates covers what one yard in Surprise can differ from the 85375 normal.