Cogswell, ND 58017 Frost Dates
Cogswell, ND: when does the frost end?
Around 05/07 is the usual last spring frost, about 252 days away. Fall's first freeze usually shows up around 10/01, roughly 146 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Cogswell in Zone 4a (-30 to -25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 5 weeks until Cogswell's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/07 isn't a guarantee
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/20 and only about 1 year in 10 sees frost after that.
Cogswell against the rest of the dataset
At roughly 146 frost-free days, Cogswell places 36,148 of 40,283 ZIP codes in this dataset. Within ND, it ranks 50 of 405.
Learn more
Before leaning on 58017's figures: zone vs. frost date explains why Zone 4a and Cogswell's frost date answer different questions, while the frost range explains how to read the range around Cogswell's dates instead of trusting one.