Larimore, ND 58251 Frost Dates
Frost dates for Larimore, ND, ZIP 58251
Around 05/11 is the usual last spring frost, about 256 days away. The first fall frost typically arrives around 09/28, about 139 frost-free days later.
Larimore sits in USDA Zone 4a (-30 to -25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 4a around Larimore 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.
Why 05/11 isn't a guarantee
05/11 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. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Larimore compares
Larimore's growing season runs about 139 days, ranking 37,245 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 137 of 405.
Learn more
zone vs. frost date explains why Zone 4a and Larimore's frost date answer different questions, and the frost range explains how to read the range around Larimore's dates instead of trusting one.