Washburn, ND 58577 Frost Dates
When can you plant in Washburn, ND?
Around 05/12 is the usual last spring frost, about 257 days away. The first fall frost typically arrives around 09/30, about 140 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 Washburn, not a forecast for this year.
What to do before the first frost
About 5 weeks of growing season left in Washburn before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/12 isn't a guarantee
05/12 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 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 Washburn compares
Washburn's growing season runs about 140 days, ranking 37,070 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 123 of 405.
Learn more
the frost range covers how to read the range around Washburn's dates instead of trusting one. local microclimates covers what one yard in Washburn can differ from the 58577 normal.