Wickenburg, AZ 85320 Frost Dates
Frost dates for Wickenburg, AZ, ZIP 85320
Around 03/17 is the usual last spring frost, about 201 days away. The first fall frost typically arrives around 11/19, about 243 frost-free days later.
Zone 9a (20 to 25°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 Wickenburg, not a forecast for this year.
What to do before the first frost
Zone 9a around Wickenburg has about 12 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
03/17 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. 04/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Wickenburg compares
At roughly 243 frost-free days, Wickenburg places 8,287 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 323 of 506.
Learn more
the frost range explains how to read the range around Wickenburg's dates instead of trusting one, and local microclimates explains what one yard in Wickenburg can differ from the 85320 normal.