Milton, ND 58260 Frost Dates
Frost dates for Milton, ND, ZIP 58260
Around 05/12 is the usual last spring frost, about 257 days away. The first fall frost typically arrives around 09/30, about 139 frost-free days later.
The USDA Plant Hardiness Zone Map puts Milton 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 Milton 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.
Why 05/12 isn't a guarantee
05/12 is the middle of 30 years of NOAA records, not a promise. Plant by 04/29 and you're betting against frost in roughly 9 years out of 10. 05/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Milton compares
Milton's growing season runs about 139 days, ranking 37,328 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 177 of 405.
Learn more
local microclimates explains what one yard in Milton can differ from the 58260 normal, and zone vs. frost date explains why Zone 3b and Milton's frost date answer different questions.