Nekoma, ND 58355 Frost Dates
Nekoma, ND: when does the frost end?
Typically, the last spring freeze lands around 05/15, roughly 260 days out. Fall's first freeze usually shows up around 09/22, roughly 128 days after the last spring frost.
Zone 3b (-35 to -30°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 Nekoma, not a forecast for this year.
Stretching the season past the first frost
With roughly 4 weeks until Nekoma's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/15 isn't a guarantee
05/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/31 and only about 1 year in 10 sees frost after that.
Nekoma against the rest of the dataset
Nekoma's growing season runs about 128 days, ranking 38,595 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 329 of 405.
Learn more
Before leaning on 58355's figures: zone vs. frost date explains why Zone 3b and Nekoma's frost date answer different questions, while the frost range explains how to read the range around Nekoma's dates instead of trusting one.