Frost Dates for 55033 — Hastings, Minnesota

Half of springs at Hastings Dam 2, MN see their last 32°F night by April 23; only one in ten is past it by April 8, and one in ten still has one after May 7. Planting tender crops after April 30 leaves a 30% risk of a frost on them, after May 2 20%, and after May 7 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 37% of the 142 Minnesota stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 19 in half of years, as early as October 5 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 11 days later, around October 30; in spring the one-in-ten date for 28°F is April 30, 7 days before the 32°F one. The freeze-free season lasts 177 days in a typical year, longer than at 97% of the 142 Minnesota stations; it reaches 197 days one year in ten and falls short of 157 one year in ten. On average 150 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 11 days longer, to about May 4, and return around October 8. Severe cold of 16°F or below comes every winter, usually between November 22 and March 22.

July is the warmest month at Hastings Dam 2, MN, averaging 83°F by day and 63°F at night; January is the coldest at 24°F and 6°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 27% of years.

Warmth for growing adds up to 2,809 growing degree days a year (base 50°F), more than at 91% of the 142 Minnesota stations. 32% of them (910) have built up by the end of June, and July adds the most, 718. Precipitation totals 33.2 inches a year, most in June (4.9") and least in January (0.9"); May to September bring 63% of it.

The nearest other station, Rosemount Rsch & Outreach Ctr, MN, 12 miles west of Hastings and 265 feet higher, has a last frost 9 days later (May 2), a first frost 14 days earlier (October 5), a season 22 days shorter.

The first measurable snow (0.1 inch or more) in Hastings usually arrives around November 25, and the last of the season around March 25. Those are the middle dates across the winters of 1991–2020 at Hastings Dam 2, MN, 2.3 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 29 days after the last snow.

ZIP 55033 is 2 miles from Hastings Dam 2, MN, which stands at 680 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 55016 (Cottage Grove). The 2023 USDA Plant Hardiness Zone Map lists ZIP 55033 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.