Frost and Freeze Dates in Iowa - Jefferson to Lyon

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 leavesEarly = 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.



Jefferson |  Johnson  |  Jones  |  Keokuk  |  Kossuth  |  Lee  |  Linn  |  Louisa  |  Lucas  |  Lyon



Jefferson 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-Sep13-Oct28-Oct5-Apr17-Apr1-May

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Johnson 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-Sep9-Oct22-Oct9-Apr22-Apr6-May

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Jones 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)
22-Sep5-Oct17-Oct16-Apr29-Apr13-May

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Keokuk 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-Sep13-Oct28-Oct7-Apr19-Apr3-May

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Kossuth 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)
25-Sep6-Oct18-Oct14-Apr28-Apr11-May

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Lee 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)
6-Oct19-Oct2-Nov4-Apr13-Apr25-Apr

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Linn 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)
25-Sep6-Oct18-Oct14-Apr26-Apr9-May

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Louisa 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)
1-Oct14-Oct28-Oct5-Apr17-Apr2-May

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Lucas 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-Sep8-Oct21-Oct10-Apr24-Apr7-May

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Lyon 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)
19-Sep30-Sep14-Oct18-Apr1-May14-May

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