Brinsmade, ND 58325 Frost Dates
Frost dates for Brinsmade, ND, ZIP 58325
Around 05/15 is the usual last spring frost, about 260 days away. The first fall frost typically arrives around 09/27, about 133 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 Brinsmade, not a forecast for this year.
What to do before the first frost
Zone 4a around Brinsmade has about 4 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.
How much risk comes with planting early here
05/15 is the middle of 30 years of NOAA records, not a promise. Plant by 05/03 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 Brinsmade compares
Brinsmade's growing season runs about 133 days, ranking 38,155 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 296 of 405.
Learn more
local microclimates explains what one yard in Brinsmade can differ from the 58325 normal, and zone vs. frost date explains why Zone 4a and Brinsmade's frost date answer different questions.