Gwinner, ND 58040 Frost Dates
Gwinner, 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.
Zone 4a (-30 to -25°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 Gwinner, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Gwinner's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
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.
Gwinner against the rest of the dataset
About 146 days separate Gwinner's last and first frost, putting it 36,075 of 40,283 ZIP codes nationally. Within ND, it ranks 47 of 405.
Learn more
Before leaning on 58040's figures: zone vs. frost date explains why Zone 4a and Gwinner's frost date answer different questions, while the frost range explains how to read the range around Gwinner's dates instead of trusting one.