Casselton, ND 58122 Frost Dates
When can you plant in Casselton, ND?
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.
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 Casselton, not a forecast for this year.
What to do before the first frost
About 5 weeks of growing season left in Casselton before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/09 isn't a guarantee
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 36,541 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 84 of 405.
Learn more
the frost range covers how to read the range around Casselton's dates instead of trusting one. local microclimates covers what one yard in Casselton can differ from the 58122 normal.