Ross, ND 58776 Frost Dates
When can you plant in Ross, ND?
Typically, the last spring freeze lands around 05/17, roughly 262 days out. The first fall frost typically arrives around 09/23, about 127 frost-free days later.
The USDA Plant Hardiness Zone Map puts Ross 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 4 weeks of growing season left in Ross before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/17 isn't a guarantee
05/17 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. 05/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Ross compares
About 127 days separate Ross's last and first frost, putting it 38,670 of 40,283 ZIP codes nationally. Within ND, it ranks 348 of 405.
Learn more
zone vs. frost date covers why Zone 4a and Ross's frost date answer different questions. the frost range covers how to read the range around Ross's dates instead of trusting one.