Frost dates in Minnesota

Across Minnesota's 179 NOAA stations with a frost every year, the typical last spring frost ranges from April 15 at La Crescent Dam 7 (650 feet above sea level) to June 5 at Hibbing Chisholm Hibbing Airport (1,350 feet above sea level). The middle station's date is May 5.

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Last frost across Minnesota

The frost-free season runs from 93 days at Hibbing Chisholm Hibbing Airport to 194 days at La Crescent Dam 7.

The station with the latest frost is about 240 miles farther north than the one with the earliest.

At 3 stations, all high or far north, frost is possible in every month.

These are typical dates: in half of springs the last frost comes later. Each place's page, and each ZIP code lookup, also gives the late-year date, after which only 1 spring in 10 has a frost. That's the safer date for tender plants.

Frost dates for Minnesota's larger places

Typical (1-in-2) dates. Each place's page has the early and late years, a planting calendar and a printable planner. Zones are for the ZIP code nearest each place's center.

Hardiness zones in Minnesota

Minnesota's 933 ZIP codes in the USDA list fall in zones 3a to 5a: 3a (1 percent), 3b (13 percent), 4a (21 percent), 4b (36 percent) and 5a (29 percent). Compared with the 2012 map, 49 percent of them moved to a warmer half zone, 50 percent stayed the same and 6 moved to a colder one.

A hardiness zone is about the coldest night of winter, which decides which shrubs, trees and perennials survive. Frost dates are about spring and fall, which decide when to plant. You need both. Read more about what the zones mean and what changed in 2023.

Every NOAA station in Minnesota

All 182 stations in Minnesota with frost statistics in NOAA's 1991 to 2020 normals, from A to Z. Station names are usually a town, an airport, or a distance and direction from a town. Find one near you and at a similar elevation.

Typical (1-in-2) dates at 32°F. For the early and late years, and a planting calendar built from your own dates, look up your ZIP code.