Ayr, ND 58029 Frost Dates
Frost dates for Ayr, ND, ZIP 58029
Typically, the last spring freeze lands around 05/09, roughly 254 days out. The first fall frost typically arrives around 10/01, about 143 frost-free days later.
Zone 4a (-30 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 Ayr, not a forecast for this year.
What to do before the first frost
Zone 4a around Ayr has about 5 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.
The actual range around Ayr's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Ayr compares
At roughly 143 frost-free days, Ayr places 36,691 of 40,283 ZIP codes in this dataset. Within ND, it ranks 103 of 405.
Learn more
the frost range explains how to read the range around Ayr's dates instead of trusting one, and local microclimates explains what one yard in Ayr can differ from the 58029 normal.