Mountain, ND 58262 Frost Dates
When can you plant in Mountain, ND?
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 Mountain in Zone 4a (-30 to -25°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
About 5 weeks of growing season left in Mountain before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Mountain's last frost
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 Mountain compares
About 139 days separate Mountain's last and first frost, putting it 37,308 of 40,283 ZIP codes nationally. Within ND, it ranks 163 of 405.
Learn more
zone vs. frost date covers why Zone 4a and Mountain's frost date answer different questions. the frost range covers how to read the range around Mountain's dates instead of trusting one.