Frost dates 2026–2027

Frost dates for Marshfield, Wisconsin

Median (50% chance) dates of the last and first 32°F frost, from NOAA 1991–2020 climate normals at Marshfield Municipal Airport, 1.9 mi away (close match).

Last spring frostMay 5
First fall frostOct 5
152 frost-free days
Last spring frostMay 51 year in 10 after May 20
First fall frostOct 51 year in 10 by Sep 21
Growing season152 daysbetween median 32°F dates
Hardiness zoneZone 4b−25 to −20°F average extreme low

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Will it freeze in Marshfield in the next 7 nights?

The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 30°F (Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST).

Tonight: forecast low 30°F. Freeze.

NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.

7 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.

Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.

Frost and freeze probabilities

Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.

These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.

Average first hard freeze in Marshfield

The median first fall hard-freeze date (28°F) is October 16, from NOAA’s 1991–2020 Climate Normals at Marshfield Municipal Airport. This is the 50% probability date, not a forecast for this year.

TemperatureLast spring date
90% · 50% · 10% chance of a later freeze
First fall date
10% · 50% · 90% chance of an earlier freeze
Season
36°F frost possible May 4 · May 17 · May 31 Sep 12 · Sep 26 · Oct 9 131 days
32°F freeze Apr 22 · May 5 · May 20 Sep 21 · Oct 5 · Oct 18 152 days
28°F hard freeze Apr 7 · Apr 23 · May 10 Sep 30 · Oct 16 · Oct 30 174 days
NOAA NCEI U.S. Climate Normals 1991–2020, station USW00094985. How to read these probabilities.

Average high temperature by month

1991–2020 normals at Marshfield Municipal Airport

Average low temperature by month

Months with lows near or below freezing carry frost risk

Where these frost dates come from

The frost dates for Marshfield, WI come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Marshfield Municipal Airport (station USW00094985, elevation 1,255 ft), 1.9 mi from Marshfield. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.

Frost dates near Marshfield

CityDistanceLast spring frostFirst fall frost
Wisconsin Rapids, WI 25 mi May 9 Sep 30
Rib Mountain, WI 29 mi May 6 Oct 4
Kronenwetter, WI 30 mi May 6 Oct 4
Rothschild, WI 30 mi May 6 Oct 4
Stevens Point, WI 32 mi May 4 Oct 7
Wausau, WI 33 mi May 6 Oct 4
Plover, WI 34 mi May 4 Oct 7
Weston, WI 34 mi May 6 Oct 4
Merrill, WI 42 mi May 11 Sep 30
Tomah, WI 50 mi May 6 Oct 3

Frequently asked questions

When is the last frost in Marshfield?

On average, the last spring frost (32°F) in Marshfield is around May 5. In about 1 year in 10 it comes after May 20, and in 9 years in 10 it comes after April 22.

When is the first frost in Marshfield?

The first fall frost (32°F) usually arrives around October 5. There’s a 10% chance of a freeze by September 21 and a 90% chance by October 18.

Can it frost in Marshfield after the last frost date?

Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after May 17.

What growing zone is Marshfield?

Marshfield is in USDA Plant Hardiness Zone 4b (average annual extreme minimum temperature −25 to −20°F), based on the 2023 USDA map for ZIP code 54449. See growing zones in Wisconsin.

More: all Wisconsin frost dates · Wisconsin growing zones · frost vs. freeze