Grenora, ND 58856 Frost Dates
Frost dates for Grenora, ND, ZIP 58856
The last spring frost here typically falls around 05/19, about 264 days from today. The first fall frost typically arrives around 09/17, about 121 frost-free days later.
The USDA Plant Hardiness Zone Map puts Grenora in Zone 4a (-30 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 4a around Grenora has about 3 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 Grenora's last frost
05/19 is the middle of 30 years of NOAA records, not a promise. Plant by 05/08 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Grenora compares
About 121 days separate Grenora's last and first frost, putting it 39,053 of 40,283 ZIP codes nationally. Within ND, it ranks 385 of 405.
Learn more
the frost range explains how to read the range around Grenora's dates instead of trusting one, and local microclimates explains what one yard in Grenora can differ from the 58856 normal.