Frost Dates for 56187 — Worthington, Minnesota

Half of springs at Worthington 2 NNE, MN see their last 32°F night by May 3; only one in ten is past it by April 19, and one in ten still has one after May 15. Planting tender crops after May 8 leaves a 30% risk of a frost on them, after May 11 20%, and after May 15 10%. The 12 days between the even-odds date and the one-in-ten date is narrower than at 85% of the 142 Minnesota stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 4 in half of years, as early as September 21 one year in ten, and holds off past October 18 one year in ten. A hard freeze of 28°F follows 11 days later, around October 15; in spring the one-in-ten date for 28°F is May 6, 9 days before the 32°F one. The freeze-free season lasts 153 days in a typical year, longer than at 57% of the 142 Minnesota stations; it reaches 172 days one year in ten and falls short of 134 one year in ten. On average 167 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 12, and return around September 25. Severe cold of 16°F or below comes every winter, usually between November 11 and March 30.

July is the warmest month at Worthington 2 NNE, MN, averaging 82°F by day and 61°F at night; January is the coldest at 23°F and 5°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 60% of years.

Warmth for growing adds up to 2,542 growing degree days a year (base 50°F), more than at 64% of the 142 Minnesota stations. 34% of them (854) have built up by the end of June, and July adds the most, 663. Precipitation totals 30.6 inches a year, most in June (5.2") and least in January (0.7"); May to September bring 65% of it.

The nearest other station, Sibley, IA, 17 miles southwest of Worthington, has a last frost 2 days later (May 5), a first frost 1 day earlier (October 3), a season 1 day shorter.

The first measurable snow (0.1 inch or more) in Worthington usually arrives around November 5, and the last of the season around April 10. Those are the middle dates across the winters of 1991–2020 at Worthington 2 NNE, 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 23 days after the last snow.

ZIP 56187 is 2 miles from Worthington 2 NNE, MN, which stands at 1,570 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 56187 in zone 5a, the band where the coldest night of the year averaged -20 to -15°F (-28.9 to -26.1°C) over 1991–2020; a zone describes winter lows, not frost dates.