Leonard, ND 58052 Frost Dates
58052, near Leonard, ND: the frost window
The last spring frost here typically falls around 05/09, about 254 days from today. Fall's first freeze usually shows up around 10/01, roughly 143 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 Leonard, not a forecast for this year.
Stretching the season past the first frost
Leonard's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Leonard's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Leonard against the rest of the dataset
About 143 days separate Leonard's last and first frost, putting it 36,637 of 40,283 ZIP codes nationally. Within ND, it ranks 95 of 405.
Learn more
Two guides worth reading on 58052: local microclimates, on what one yard in Leonard can differ from the 58052 normal, and zone vs. frost date, on why Zone 4a and Leonard's frost date answer different questions.