Burlington, ND 58702 Frost Dates
Frost dates for Burlington, ND, ZIP 58702
Around 05/10 is the usual last spring frost, about 255 days away. The first fall frost typically arrives around 10/01, about 144 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 Burlington, not a forecast for this year.
What to do before the first frost
Zone 4a around Burlington 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 05/10 isn't a guarantee
05/10 is the middle of 30 years of NOAA records, not a promise. Plant by 04/27 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Burlington compares
About 144 days separate Burlington's last and first frost, putting it 36,399 of 40,283 ZIP codes nationally. Within ND, it ranks 70 of 405.
Learn more
local microclimates explains what one yard in Burlington can differ from the 58702 normal, and zone vs. frost date explains why Zone 4a and Burlington's frost date answer different questions.