Frost Dates for 55934 — Eyota, Minnesota

Half of springs at Rochester International Airport, MN see their last 32°F night by April 30; only one in ten is past it by April 15, and one in ten still has one after May 13. Planting tender crops after May 5 leaves a 30% risk of a frost on them, after May 8 20%, and after May 13 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 6 in half of years, as early as September 22 one year in ten, and holds off past October 20 one year in ten. A hard freeze of 28°F follows 11 days later, around October 17; in spring the one-in-ten date for 28°F is May 2, 11 days before the 32°F one. The freeze-free season lasts 159 days in a typical year, longer than at 74% of the 142 Minnesota stations; it reaches 178 days one year in ten and falls short of 140 one year in ten. On average 156 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 9, and return around September 28. Severe cold of 16°F or below comes every winter, usually between November 14 and March 25.

July is the warmest month at Rochester International Airport, MN, averaging 80°F by day and 61°F at night; January is the coldest at 23°F and 7°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 49% of years.

Warmth for growing adds up to 2,511 growing degree days a year (base 50°F), more than at 60% of the 142 Minnesota stations. 34% of them (860) have built up by the end of June, and July adds the most, 637. Precipitation totals 34.7 inches a year, most in June (5.4") and least in January (1.0"); May to September bring 63% of it.

The nearest other station, Theilman 1SSW, MN, 19 miles north of Eyota and 551 feet lower, has a last frost 7 days later (May 7), a first frost 4 days earlier (October 2), a season 11 days shorter.

The first measurable snow (0.1 inch or more) in Eyota usually arrives around November 8, and the last of the season around April 12. Those are the middle dates across the winters of 1991–2020 at Elgin 2SSW, MN, 6.3 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 18 days after the last snow.

ZIP 55934 is 14 miles from Rochester International Airport, MN, which stands at 1,304 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station; its figures are presented in full for 55904 (Rochester). The 2023 USDA Plant Hardiness Zone Map lists ZIP 55934 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.