Hampden, ND 58338 Frost Dates
When can you plant in Hampden, ND?
The last spring frost here typically falls around 05/15, about 260 days from today. The first fall frost typically arrives around 09/22, about 128 frost-free days later.
The USDA Plant Hardiness Zone Map puts Hampden 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 4 weeks of growing season left in Hampden before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/15 isn't a guarantee
05/15 is the middle of 30 years of NOAA records, not a promise. Plant by 05/04 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hampden compares
About 128 days separate Hampden's last and first frost, putting it 38,594 of 40,283 ZIP codes nationally. Within ND, it ranks 328 of 405.
Learn more
local microclimates covers what one yard in Hampden can differ from the 58338 normal. zone vs. frost date covers why Zone 4a and Hampden's frost date answer different questions.