Wilton, ND 58579 Frost Dates
Wilton, ND: when does the frost end?
The last spring frost here typically falls around 05/11, about 256 days from today. Fall's first freeze usually shows up around 09/30, roughly 142 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 Wilton, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Wilton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Wilton's last frost
05/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/25 and only about 1 year in 10 sees frost after that.
Wilton against the rest of the dataset
At roughly 142 frost-free days, Wilton places 36,781 of 40,283 ZIP codes in this dataset. Within ND, it ranks 110 of 405.
Learn more
Before leaning on 58579's figures: the frost range explains how to read the range around Wilton's dates instead of trusting one, while local microclimates explains what one yard in Wilton can differ from the 58579 normal.