Casselton, ND 58124 Frost Dates
Frost dates for Casselton, ND, ZIP 58124
Around 05/09 is the usual last spring frost, about 254 days away. 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
At roughly 143 frost-free days, Casselton places 36,542 of 40,283 ZIP codes in this dataset. Within ND, it ranks 85 of 405.
Learn more
zone vs. frost date explains why Zone 4a and Casselton's frost date answer different questions, and the frost range explains how to read the range around Casselton's dates instead of trusting one.