Richardton, ND 58652 Frost Dates
Frost dates for Richardton, ND, ZIP 58652
Typically, the last spring freeze lands around 05/09, roughly 254 days out. The first fall frost typically arrives around 10/01, about 145 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 Richardton, not a forecast for this year.
What to do before the first frost
Zone 4a around Richardton 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 Richardton's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 05/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Richardton compares
About 145 days separate Richardton's last and first frost, putting it 36,253 of 40,283 ZIP codes nationally. Within ND, it ranks 54 of 405.
Learn more
the frost range explains how to read the range around Richardton's dates instead of trusting one, and local microclimates explains what one yard in Richardton can differ from the 58652 normal.