Frost Dates for 55122 — Eagan, Minnesota

Half of springs at Minneapolis/St Paul Airport, 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 18 in half of years, as early as October 1 one year in ten, and holds off past October 31 one year in ten. A hard freeze of 28°F follows 11 days later, around October 29; in spring the one-in-ten date for 28°F is April 28, 9 days before the 32°F one. The freeze-free season lasts 176 days in a typical year, longer than at 96% of the 142 Minnesota stations; it reaches 196 days one year in ten and falls short of 158 one year in ten. On average 147 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 10 days longer, to about May 3, and return around October 6. Severe cold of 16°F or below comes every winter, usually between November 20 and March 20.

July is the warmest month at Minneapolis/St Paul Airport, MN, averaging 83°F by day and 65°F at night; January is the coldest at 24°F and 9°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 25% of years.

Warmth for growing adds up to 2,966 growing degree days a year (base 50°F), more than at 97% of the 142 Minnesota stations. 34% of them (998) have built up by the end of June, and July adds the most, 755. Precipitation totals 31.7 inches a year, most in June (4.6") and least in January (0.9"); May to September bring 63% of it.

The nearest other station, Rosemount Rsch & Outreach Ctr, MN, 8 miles southeast of Eagan, has a last frost 9 days later (May 2), a first frost 13 days earlier (October 5), a season 21 days shorter.

The first measurable snow (0.1 inch or more) in Eagan usually arrives around November 9, and the last of the season around April 12. Those are the middle dates across the winters of 1991–2020 at Minneapolis/St Paul Airport, MN, 5.6 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 11 days after the last snow.

ZIP 55122 is 6 miles from Minneapolis/St Paul Airport, MN, which stands at 872 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 12 other ZIP codes share the station; its figures are presented in full for 55337 (Burnsville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 55122 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.