Hebron, ND 58638 Frost Dates
When can you plant in Hebron, ND?
Around 05/19 is the usual last spring frost, about 264 days away. The first fall frost typically arrives around 09/21, about 123 frost-free days later.
The USDA Plant Hardiness Zone Map puts Hebron in Zone 4a (-30 to -25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 3 weeks of growing season left in Hebron before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/19 isn't a guarantee
05/19 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. 06/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hebron compares
Hebron's growing season runs about 123 days, ranking 38,911 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 375 of 405.
Learn more
local microclimates covers what one yard in Hebron can differ from the 58638 normal. zone vs. frost date covers why Zone 4a and Hebron's frost date answer different questions.