Cogswell, ND 58069 Frost Dates
Frost dates for Cogswell, ND, ZIP 58069
The last spring frost here typically falls around 05/07, about 252 days from today. The first fall frost typically arrives around 10/01, about 146 frost-free days later.
Cogswell sits in USDA Zone 4a (-30 to -25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 4a around Cogswell 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.
Why 05/07 isn't a guarantee
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cogswell compares
About 146 days separate Cogswell's last and first frost, putting it 36,149 of 40,283 ZIP codes nationally. Within ND, it ranks 51 of 405.
Learn more
the frost range explains how to read the range around Cogswell's dates instead of trusting one, and local microclimates explains what one yard in Cogswell can differ from the 58069 normal.