Grenora, ND 58845 Frost Dates
Frost dates for Grenora, ND, ZIP 58845
Around 05/18 is the usual last spring frost, about 263 days away. The first fall frost typically arrives around 09/21, about 125 frost-free days later.
The USDA Plant Hardiness Zone Map puts Grenora in Zone 3b (-35 to -30°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 3b 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
05/18 is the middle of 30 years of NOAA records, not a promise. Plant by 05/06 and you're betting against frost in roughly 9 years out of 10. 05/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Grenora compares
About 125 days separate Grenora's last and first frost, putting it 38,815 of 40,283 ZIP codes nationally. Within ND, it ranks 363 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 58845 normal.