Frost Dates for 56267 — Morris, Minnesota

Half of springs at Morris W Cntrl Rsch & Outreach, MN see their last 32°F night by May 4; only one in ten is past it by April 21, and one in ten still has one after May 17. Planting tender crops after May 9 leaves a 30% risk of a frost on them, after May 12 20%, and after May 17 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 61% of the 142 Minnesota stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 1 in half of years, as early as September 19 one year in ten, and holds off past October 17 one year in ten. A hard freeze of 28°F follows 10 days later, around October 11; in spring the one-in-ten date for 28°F is May 7, 10 days before the 32°F one. The freeze-free season lasts 150 days in a typical year, shorter than at 51% of the 142 Minnesota stations; it reaches 169 days one year in ten and falls short of 131 one year in ten. On average 173 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 9 days longer, to about May 13, and return around September 23. Severe cold of 16°F or below comes every winter, usually between November 10 and March 31.

July is the warmest month at Morris W Cntrl Rsch & Outreach, MN, averaging 81°F by day and 60°F at night; January is the coldest at 19°F and 1°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 65% of years.

Warmth for growing adds up to 2,360 growing degree days a year (base 50°F), fewer than at 56% of the 142 Minnesota stations. 33% of them (788) have built up by the end of June, and July adds the most, 629. Precipitation totals 27.0 inches a year, most in June (4.4") and least in January (0.7"); May to September bring 67% of it.

The nearest other station, Glenwood 2WNW, MN, 23 miles east of Morris, has a last frost 7 days later (May 11), a first frost 4 days earlier (September 27), a season 11 days shorter.

The first measurable snow (0.1 inch or more) in Morris usually arrives around November 2, and the last of the season around April 13. Those are the middle dates across the winters of 1991–2020 at Morris W Cntrl Rsch & Outreach, MN, 1.7 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 21 days after the last snow.

ZIP 56267 is 2 miles from Morris W Cntrl Rsch & Outreach, MN, which stands at 1,140 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 56267 in zone 4b, the band where the coldest night of the year averaged -25 to -20°F (-31.7 to -28.9°C) over 1991–2020; a zone describes winter lows, not frost dates.