Dunn Center, ND 58644 Frost Dates
Frost dates for Dunn Center, ND, ZIP 58644
Around 05/20 is the usual last spring frost, about 265 days away. The first fall frost typically arrives around 09/21, about 125 frost-free days later.
Dunn Center 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 Dunn Center has about 3 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 05/20 isn't a guarantee
05/20 is the middle of 30 years of NOAA records, not a promise. Plant by 05/07 and you're betting against frost in roughly 9 years out of 10. 06/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Dunn Center compares
Dunn Center's growing season runs about 125 days, ranking 38,812 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 362 of 405.
Learn more
local microclimates explains what one yard in Dunn Center can differ from the 58644 normal, and zone vs. frost date explains why Zone 4a and Dunn Center's frost date answer different questions.