Tower City, ND 58071 Frost Dates
Frost dates for Tower City, ND, ZIP 58071
The last spring frost here typically falls around 05/13, about 258 days from today. The first fall frost typically arrives around 09/26, about 136 frost-free days later.
The USDA Plant Hardiness Zone Map puts Tower City 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
Zone 4a around Tower City has about 4 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 05/13 isn't a guarantee
05/13 is the middle of 30 years of NOAA records, not a promise. Plant by 05/02 and you're betting against frost in roughly 9 years out of 10. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Tower City compares
About 136 days separate Tower City's last and first frost, putting it 37,793 of 40,283 ZIP codes nationally. Within ND, it ranks 238 of 405.
Learn more
the frost range explains how to read the range around Tower City's dates instead of trusting one, and local microclimates explains what one yard in Tower City can differ from the 58071 normal.