Calvin, ND 58323 Frost Dates
Frost dates for Calvin, ND, ZIP 58323
The last spring frost here typically falls around 05/18, about 263 days from today. The first fall frost typically arrives around 09/23, about 127 frost-free days later.
The USDA Plant Hardiness Zone Map puts Calvin 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 Calvin 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
05/18 is the middle of 30 years of NOAA records, not a promise. Plant by 05/05 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 Calvin compares
At roughly 127 frost-free days, Calvin places 38,675 of 40,283 ZIP codes in this dataset. Within ND, it ranks 353 of 405.
Learn more
the frost range explains how to read the range around Calvin's dates instead of trusting one, and local microclimates explains what one yard in Calvin can differ from the 58323 normal.