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When to plant in Mequon, WI

Planting dates worked out from Mequon's own frost records, not a generic zone chart.

Safe to plant out
May 28
1 year in 10 has a later frost
Average last frost
May 7
about a 50% chance of a later one
Average first fall frost
Oct 6
1 year in 10 by Sep 23
Frost-free days
154
median, 1991–2020

Station used: Germantown Wastewater Utility · 7.9 km away · station 265 m, town 204 m. How we match towns to stations

This season

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Planting dates for common crops

CropStart indoorsPlant out or sowHarvest from
Tomato Apr 2 – Apr 16 May 28 – Jun 11 Jul 22
Sweet pepper Mar 19 – Apr 2 May 28 – Jun 11 Jul 27
Lettuce (leaf) Mar 7 – Mar 14 Apr 11 – Apr 25 May 21
Peas — Apr 11 – May 9 Jun 5
Bush beans — May 21 – Jun 11 Jul 10
Carrot — Apr 22 – Jun 3 Jun 21
Beet — Apr 22 – Jun 3 Jun 11
Potato — Apr 22 – May 13 Jul 1
Kale Mar 7 – Mar 21 Apr 18 – May 2 May 31
Broccoli Feb 28 – Mar 14 Apr 11 – May 2 Jun 10
Cucumber Apr 30 – May 7 May 28 – Jun 11 Jul 17
Summer squash and zucchini Apr 30 – May 7 May 28 – Jun 11 Jul 12
Winter squash Apr 30 – May 7 May 28 – Jun 11 Aug 16
Sweet corn — May 21 – Jun 11 Jul 20
Onion (from sets) — Apr 11 – May 2 Jul 10
Garlic — Sep 22 – Oct 20 (fall) following summer
Spinach — Apr 11 – May 9 May 19
Basil Apr 16 – Apr 30 May 28 – Jun 11 Jul 24

Plan all 65 crops for Mequon

Mequon's weather over time

How the growing season has shifted here, year by year, from the station's own records.

Apr 15May 1May 15Jun 1Jun 15 19501960197019801990200020102020
Each year's last spring frostLong-term trend
See the data as a table
YearLast spring frost
1945Jun 5
1946May 13
1947May 29
1949May 11
1950May 8
1951May 13
1952Apr 25
1953May 15
1954May 20
1956May 24
1957May 16
1958May 26
1959May 8
1960May 13
1961May 27
1962Apr 23
1963May 24
1964May 29
1965May 29
1966May 30
1967May 23
1968May 6
1969May 26
1970May 7
1971May 28
1972Jun 11
1973May 17
1974May 10
1975Apr 26
1976May 19
1977May 10
1978May 22
1979May 16
1980May 9
1981May 12
1982Apr 30
1983May 26
1984May 16
1985May 22
1986May 3
1987May 12
1988May 25
1989May 7
1990Jun 5
1991May 3
1992May 27
1993May 29
1994May 27
1995May 5
1996May 31
1997May 22
1998Apr 28
1999Apr 26
2000Apr 30
2001Apr 19
2002May 21
2003Jun 1
2004May 5
2005May 3
2006May 6
2007Apr 16
2008May 28
2009Apr 23
2010May 10
2011Apr 21
2012Apr 29
2013May 13
2014Apr 24
2015May 1
2016Apr 15
2017May 9
2018Apr 30
2019Apr 29
2020May 14
2021May 12
2022May 5
2023Apr 28
2024Apr 26
2025May 9

What this means for you: Since 1945, Mequon's last spring frost has come about 2 days earlier per decade, on average. The frost-free season has grown by about 4 days per decade. Year-to-year swings are large, so keep using the safe date rather than the trend.

Source: daily records from Germantown Wastewater Utility (NOAA GHCN-Daily). Years with too many missing days are left out.

Nearby towns

ThiensvilleGermantownBrown DeerMenomonee FallsCedarburgRiver Hills