Fargo, ND 58103 Frost Dates
Frost dates for Fargo, ND, ZIP 58103
Around 05/04 is the usual last spring frost, about 249 days away. The first fall frost typically arrives around 10/02, about 151 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 Fargo, not a forecast for this year.
What to do before the first frost
Zone 4a around Fargo has about 5 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 05/04 isn't a guarantee
05/04 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 and you're betting against frost in roughly 9 years out of 10. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fargo compares
About 151 days separate Fargo's last and first frost, putting it 34,929 of 40,283 ZIP codes nationally. Within ND, it ranks 35 of 405.
Learn more
local microclimates explains what one yard in Fargo can differ from the 58103 normal, and zone vs. frost date explains why Zone 4a and Fargo's frost date answer different questions.