Frost Dates for 55123 — Eagan, Minnesota

Half of springs at Rosemount Rsch & Outreach Ctr, MN see their last 32°F night by May 2; only one in ten is past it by April 19, and one in ten still has one after May 16. Planting tender crops after May 8 leaves a 30% risk of a frost on them, after May 11 20%, and after May 16 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 5 in half of years, as early as September 22 one year in ten, and holds off past October 19 one year in ten. A hard freeze of 28°F follows 12 days later, around October 17; in spring the one-in-ten date for 28°F is May 7, 9 days before the 32°F one. The freeze-free season lasts 155 days in a typical year, longer than at 64% of the 142 Minnesota stations; it reaches 173 days one year in ten and falls short of 136 one year in ten. On average 159 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 12, and return around September 28. Severe cold of 16°F or below comes every winter, usually between November 12 and March 27.

July is the warmest month at Rosemount Rsch & Outreach Ctr, MN, averaging 81°F by day and 61°F at night; January is the coldest at 22°F and 3°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 56% of years.

Warmth for growing adds up to 2,515 growing degree days a year (base 50°F), more than at 61% of the 142 Minnesota stations. 33% of them (837) have built up by the end of June, and July adds the most, 654.

The nearest other station, Minneapolis/St Paul Airport, MN, 7 miles northwest of Eagan, has a last frost 9 days earlier (April 23), a first frost 13 days later (October 18), a season 21 days longer.

The first measurable snow (0.1 inch or more) in Eagan usually arrives around November 23, and the last of the season around March 25. Those are the middle dates across the winters of 1991–2020 at Rosemount Rsch & Outreach Ctr, MN, 6.3 miles away: half of years saw snow earlier, half later. Snow fell in 93% of those winters. The last 32°F night of spring typically comes 38 days after the last snow.

ZIP 55123 is 6 miles from Rosemount Rsch & Outreach Ctr, MN, which stands at 945 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 55068 (Rosemount). The 2023 USDA Plant Hardiness Zone Map lists ZIP 55123 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.