Marana, AZ 85743 Frost Dates
Frost dates for Marana, AZ, ZIP 85743
The last spring frost here typically falls around 02/23, about 179 days from today. The first fall frost typically arrives around 12/06, about 287 frost-free days later.
Zone 9b (25 to 30°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 Marana, not a forecast for this year.
What to do before the first frost
Zone 9b around Marana has about 14 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
02/23 is the middle of 30 years of NOAA records, not a promise. Plant by 01/15 and you're betting against frost in roughly 9 years out of 10. 03/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Marana compares
At roughly 287 frost-free days, Marana places 4,579 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 283 of 506.
Learn more
zone vs. frost date explains why Zone 9b and Marana's frost date answer different questions, and the frost range explains how to read the range around Marana's dates instead of trusting one.