Frost and Freeze Dates in Iowa - Madison to Muscatine

Below is the likelihood of experiencing 32°F on or before the given date in fall and on or after the given date in spring.

Oak with frost on leaves Early = only 10% of all freeze dates occurred before this day.
Average = the average freeze date for this location.
Late = only 10% of all freeze dates occurred after this day.

This information is based on weather data collected from 1950-2021 provided by the Midwestern Regional Climate Center (MRCC). Visit that website to get more detailed information and statistics.

Madison | Mahaska | Marion | Marshall | Mills | Mitchell | Monona | Monroe | Montgomery | Muscatine

Madison County

Early = only 10% of all freeze dates occurred before this day.
Average = the average freeze date for this location.
Late = only 10% of all freeze dates occurred after this day.

Early First Fall Freeze (32°F)	Average First Fall Freeze (32°F)	Late First Fall Freeze (32°F)	Early Last Spring Freeze Date (32°F)	Average Last Spring Freeze Date (32°F)	Late Last Spring Freeze Date (32°F)
23-Sep	7-Oct	21-Oct	10-Apr	25-Apr	9-May

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Mahaska County

Early = only 10% of all freeze dates occurred before this day.
Average = the average freeze date for this location.
Late = only 10% of all freeze dates occurred after this day.

Early First Fall Freeze (32°F)	Average First Fall Freeze (32°F)	Late First Fall Freeze (32°F)	Early Last Spring Freeze Date (32°F)	Average Last Spring Freeze Date (32°F)	Late Last Spring Freeze Date (32°F)
27-Sep	11-Oct	27-Oct	8-Apr	20-Apr	3-May

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Marion County

Early = only 10% of all freeze dates occurred before this day.
Average = the average freeze date for this location.
Late = only 10% of all freeze dates occurred after this day.

Early First Fall Freeze (32°F)	Average First Fall Freeze (32°F)	Late First Fall Freeze (32°F)	Early Last Spring Freeze Date (32°F)	Average Last Spring Freeze Date (32°F)	Late Last Spring Freeze Date (32°F)
29-Sep	11-Oct	28-Oct	6-Apr	20-Apr	3-May

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Marshall County

Early = only 10% of all freeze dates occurred before this day.
Average = the average freeze date for this location.
Late = only 10% of all freeze dates occurred after this day.

Early First Fall Freeze (32°F)	Average First Fall Freeze (32°F)	Late First Fall Freeze (32°F)	Early Last Spring Freeze Date (32°F)	Average Last Spring Freeze Date (32°F)	Late Last Spring Freeze Date (32°F)
26-Sep	8-Oct	21-Oct	13-Apr	24-Apr	8-May

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Mills County

Early = only 10% of all freeze dates occurred before this day.
Average = the average freeze date for this location.
Late = only 10% of all freeze dates occurred after this day.

Early First Fall Freeze (32°F)	Average First Fall Freeze (32°F)	Late First Fall Freeze (32°F)	Early Last Spring Freeze Date (32°F)	Average Last Spring Freeze Date (32°F)	Late Last Spring Freeze Date (32°F)
28-Sep	10-Oct	27-Oct	8-Apr	22-Apr	8-May

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Mitchell County

Early = only 10% of all freeze dates occurred before this day.
Average = the average freeze date for this location.
Late = only 10% of all freeze dates occurred after this day.

Early First Fall Freeze (32°F)	Average First Fall Freeze (32°F)	Late First Fall Freeze (32°F)	Early Last Spring Freeze Date (32°F)	Average Last Spring Freeze Date (32°F)	Late Last Spring Freeze Date (32°F)
23-Sep	6-Oct	19-Oct	16-Apr	30-Apr	11-May

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Monona County

Early = only 10% of all freeze dates occurred before this day.
Average = the average freeze date for this location.
Late = only 10% of all freeze dates occurred after this day.

Early First Fall Freeze (32°F)	Average First Fall Freeze (32°F)	Late First Fall Freeze (32°F)	Early Last Spring Freeze Date (32°F)	Average Last Spring Freeze Date (32°F)	Late Last Spring Freeze Date (32°F)
26-Sep	7-Oct	22-Oct	9-Apr	26-Apr	10-May

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Monroe County

Early = only 10% of all freeze dates occurred before this day.
Average = the average freeze date for this location.
Late = only 10% of all freeze dates occurred after this day.

Early First Fall Freeze (32°F)	Average First Fall Freeze (32°F)	Late First Fall Freeze (32°F)	Early Last Spring Freeze Date (32°F)	Average Last Spring Freeze Date (32°F)	Late Last Spring Freeze Date (32°F)
30-Sep	14-Oct	28-Oct	6-Apr	19-Apr	3-May

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Montgomery County

Early = only 10% of all freeze dates occurred before this day.
Average = the average freeze date for this location.
Late = only 10% of all freeze dates occurred after this day.

Early First Fall Freeze (32°F)	Average First Fall Freeze (32°F)	Late First Fall Freeze (32°F)	Early Last Spring Freeze Date (32°F)	Average Last Spring Freeze Date (32°F)	Late Last Spring Freeze Date (32°F)
23-Sep	8-Oct	24-Oct	9-Apr	24-Apr	9-May

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Muscatine County

Early = only 10% of all freeze dates occurred before this day.
Average = the average freeze date for this location.
Late = only 10% of all freeze dates occurred after this day.

Early First Fall Freeze (32°F)	Average First Fall Freeze (32°F)	Late First Fall Freeze (32°F)	Early Last Spring Freeze Date (32°F)	Average Last Spring Freeze Date (32°F)	Late Last Spring Freeze Date (32°F)
30-Sep	14-Oct	28-Oct	5-Apr	17-Apr	30-Apr

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