Marana, AZ 85145 Frost Dates
Frost dates for Marana, AZ, ZIP 85145
The last spring frost here typically falls around 02/06, about 162 days from today. The first fall frost typically arrives around 12/09, about 308 frost-free days later.
The USDA Plant Hardiness Zone Map puts Marana in Zone 9a (20 to 25°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
Zone 9a around Marana has about 15 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
02/06 is the middle of 30 years of NOAA records, not a promise. Plant by 01/06 and you're betting against frost in roughly 9 years out of 10. 03/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Marana compares
Marana's growing season runs about 308 days, ranking 3,648 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 233 of 506.
Learn more
zone vs. frost date explains why Zone 9a 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.