Bergen, ND 58792 Frost Dates
Frost dates for Bergen, ND, ZIP 58792
Around 05/22 is the usual last spring frost, about 267 days away. The first fall frost typically arrives around 09/22, about 123 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 Bergen, not a forecast for this year.
What to do before the first frost
Zone 4a around Bergen has about 4 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
05/22 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. 06/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bergen compares
About 123 days separate Bergen's last and first frost, putting it 38,928 of 40,283 ZIP codes nationally. Within ND, it ranks 380 of 405.
Learn more
the frost range explains how to read the range around Bergen's dates instead of trusting one, and local microclimates explains what one yard in Bergen can differ from the 58792 normal.