Casselton, ND 58106 Frost Dates
Frost dates for Casselton, ND, ZIP 58106
The last spring frost here typically falls around 05/09, about 254 days from today. The first fall frost typically arrives around 10/01, about 143 frost-free days later.
The USDA Plant Hardiness Zone Map puts Casselton 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 Casselton 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.
The actual range around Casselton's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Casselton compares
Casselton's growing season runs about 143 days, ranking 36,537 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 80 of 405.
Learn more
local microclimates explains what one yard in Casselton can differ from the 58106 normal, and zone vs. frost date explains why Zone 4a and Casselton's frost date answer different questions.