When is the last frost in Waukesha, WI?

The average last spring frost date in Waukesha, WI is May 7. This is when it is generally safe to plant frost-sensitive vegetables and flowers outdoors.

When is the first frost in Waukesha, WI?

The average first fall frost date in Waukesha, WI is Oct 7. Plan to harvest frost-sensitive crops before this date.

How long is the growing season in Waukesha, WI?

The growing season in Waukesha, WI is approximately 152 days, measured from the last spring frost to the first fall frost.

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Frost Dates for Waukesha, WI

Location Waukesha, WI

Frost Dates

Waukesha, WI

Use our 2026 Frost Dates Calculator to find the first fall frost and last spring frost dates for your area, based on historical climate data from the weather station nearest your ZIP or Postal Code.

Nearest Climate Station	Altitude	Last Spring Frost	First Fall Frost	Growing Season
WAUKESHA WWTP, WI	790'	May 7	Oct 7	152 days

Last and first frost dates are 30% probability. Calculated using 1991-2020 Climate Normals from NOAA.

There is a 3 in 10 chance of temperatures reaching 32°F (0°C) or lower after the listed spring date or before the listed fall date. Use these dates as a guide, not a guarantee.