Upham, ND 58789 Frost Dates
When can you plant in Upham, ND?
Typically, the last spring freeze lands around 05/15, roughly 260 days out. The first fall frost typically arrives around 09/25, about 132 frost-free days later.
Zone 3b (-35 to -30°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 Upham, not a forecast for this year.
What to do before the first frost
About 4 weeks of growing season left in Upham 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 05/03 and you're betting against frost in roughly 9 years out of 10. 05/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Upham compares
Upham's growing season runs about 132 days, ranking 38,235 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 301 of 405.
Learn more
local microclimates covers what one yard in Upham can differ from the 58789 normal. zone vs. frost date covers why Zone 3b and Upham's frost date answer different questions.