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Iowa State University Department of Agronomy

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Freezing Dates

Using the NWS COOP data archive, significant dates relating to fall are extracted and presented on this page. The specific dates are the first occurance of that temperature and may have occured again in subsequent years.
The "Record Lows" columns show the first fall occurance of a low temperature. The "Average Lows" column shows when certain climatological thresholds are surpassed in the fall.

COOP Site: Record Lows: Average Lows:
Temp <= 32°F Temp <= 28°F Below 40°F Below 32°F Below 28°F
Temp: Date: Temp: Date:
Albia 31 1991-09-19 25 1984-09-29 10-25 11-06 11-21
Algona 29 1893-09-02 27 1929-09-18 10-17 11-02 11-10
Allerton 31 1991-09-19 27 1984-09-29 10-18 11-05 11-18
Allison 30 1991-09-20 28 1984-09-26 10-18 11-03 11-16
Ames 31 1902-09-13 26 1918-09-21 10-18 11-02 11-12
Anamosa 29 1955-09-12 27 1956-09-20 10-10 11-03 11-12
Ankeny 32 1991-09-20 28 1984-09-26 10-18 11-04 11-20
Atlantic 30 1893-09-02 28 1902-09-12 10-17 11-02 11-10
Audubon 30 1955-09-12 28 1991-09-20 10-10 11-02 11-10
Bedford 27 1991-09-19 27 1991-09-19 10-19 11-04 11-20
Belle-plaine 32 1955-09-12 28 1991-09-20 10-18 11-04 11-19
Bellevue 31 1991-09-20 25 1995-09-23 10-18 11-04 11-21
Bloomfield 31 1991-09-20 25 1974-10-02 10-19 11-05 11-21
Boone 32 1975-09-12 28 1981-09-18 10-10 11-01 11-04
Britt 31 2007-09-15 25 1983-09-22 10-09 11-02 11-08
Burlington 32 1991-09-20 26 2003-10-02 10-25 11-10 11-24
Carroll 28 1974-09-03 28 1974-09-03 10-07 10-29 11-08
Cascade 32 1955-09-11 28 1953-09-22 10-07 11-03 11-10
Castana 30 1991-09-19 28 1995-09-22 10-18 11-03 11-19
Cedar Rapids 32 2007-09-15 24 1926-09-26 10-19 11-05 11-21
Centerville 32 1991-09-19 27 1979-10-05 10-19 11-05 11-23
Chariton 32 1955-09-12 28 1991-09-20 10-18 11-04 11-20
Charles City 32 1955-09-12 28 1991-09-20 10-10 11-03 11-10
Cherokee 31 1974-09-03 27 1955-09-11 10-07 10-26 11-04
Clarinda 31 1902-09-13 28 1918-09-21 10-19 11-03 11-19
Clarion 32 1974-09-03 25 1974-09-22 10-09 10-28 11-07
Clinton 22 1924-08-31 22 1924-08-31 10-19 11-06 11-22
Colombus Junction 31 1955-09-12 28 1991-09-20 10-19 11-05 11-21
Corning 32 1902-09-12 27 1983-09-21 10-18 11-03 11-19
Cresco 31 1975-09-13 27 1991-09-20 10-07 10-29 11-05
Creston 28 1991-09-19 28 1991-09-19 10-18 11-03 11-20
Decorah 32 1915-08-30 28 1946-09-02 10-10 11-02 11-10
Denison 29 1902-09-12 21 1918-09-21 10-18 11-02 11-12
Des Moines 31 1995-09-22 28 1984-09-29 10-19 11-05 11-20
Dubuque 31 1956-09-20 28 1952-10-06 10-28 11-10 11-24
Emmetsburg 31 1991-09-19 24 1995-09-22 10-10 11-02 11-08
Estherville 30 2007-09-15 28 1991-09-20 10-07 10-28 11-05
Fairfield 32 1917-09-11 28 1918-09-21 10-24 11-08 11-22
Fayette 32 1949-09-01 27 1902-09-12 10-10 10-28 11-10
Forest City 31 2007-09-15 26 1974-09-22 10-09 11-02 11-08
Fort Dodge 32 1974-09-03 28 1995-09-22 10-09 11-02 11-10
Fort Madison 32 1983-09-23 27 1974-10-02 10-28 11-10 11-24
Glenwood 27 1901-09-18 27 1901-09-18 10-19 11-04 11-21
Greenfield 32 1981-09-17 28 1995-09-22 10-19 11-04 11-20
Grinnell 31 1976-09-10 27 1991-09-20 10-17 11-03 11-12
Grundy Center 31 2007-09-15 27 1974-09-22 10-07 10-29 11-07
Guthrie Center 31 1893-09-02 28 1991-09-19 10-17 11-02 11-11
Guttenburg 32 1973-09-18 28 1984-09-29 10-19 11-05 11-21
Hampton 32 1955-09-11 28 1955-09-12 10-12 11-02 11-10
Harlan 29 1991-09-19 27 1951-09-28 10-17 11-03 11-10
Hawarden 31 1974-09-03 24 1991-09-19 10-09 10-28 11-04
Humboldt 32 1976-09-17 26 1974-09-22 10-09 11-02 11-07
Ida Grove 32 1974-09-03 28 1962-09-20 10-09 10-28 11-04
Independence 32 1974-09-03 28 1975-09-13 10-10 11-03 11-10
Indianola 30 1979-09-15 28 1979-09-22 10-19 11-08 11-21
Iowa City 32 1956-09-20 24 1958-10-01 10-19 11-06 11-21
Iowa Falls 32 1976-09-10 26 1974-09-22 10-10 11-02 11-07
Jefferson 32 2007-09-16 23 1974-10-02 10-18 11-04 11-19
Keosauqua 31 1917-09-11 28 1916-09-18 10-24 11-09 11-22
Knoxville 31 1991-09-19 27 1974-10-02 10-19 11-07 11-21
Lamoni 32 1991-09-19 24 1974-10-02 10-18 11-05 11-21
Le Claire L&D 14 32 1984-09-29 25 1974-10-02 10-28 11-11 11-24
Lemars 25 1893-09-02 25 1893-09-02 10-17 10-29 11-08
Logan 30 1902-09-12 28 1902-09-13 10-18 11-02 11-12
Manchester 29 2007-09-15 27 1984-09-16 10-07 10-28 11-09
Maquoketa 31 1917-09-11 28 1983-09-23 10-17 11-04 11-13
Marshalltown 31 1955-09-12 28 1896-09-20 10-17 11-02 11-11
Mason City 30 1915-08-30 28 1923-09-14 10-10 11-01 11-08
Milford 32 1974-09-03 27 1983-09-21 10-09 10-29 11-04
Mount Ayr 32 1902-09-13 28 1991-09-19 10-23 11-05 11-21
Mount Pleasant 29 1991-09-20 25 1974-10-02 10-19 11-10 11-21
Muscatine 29 1991-09-20 26 1984-09-29 10-19 11-10 11-24
New Hampton 28 1949-09-01 28 1949-09-01 10-17 11-02 11-10
Newton 29 1974-09-22 27 1972-09-30 10-18 11-05 11-21
Northwood 31 1953-09-13 26 1974-09-22 10-09 11-02 11-05
Oakland 32 1974-09-03 28 1995-09-22 10-10 11-03 11-10
Oelwein 28 1955-09-11 28 1955-09-11 10-10 11-02 11-10
Onawa 30 1955-09-11 28 1991-09-19 10-19 11-02 11-11
Osage 32 2007-09-15 28 1974-09-22 10-17 11-03 11-10
Osceola 31 2007-09-15 28 1974-09-22 10-18 11-04 11-20
Oskaloosa 31 1902-09-13 27 1991-09-20 10-19 11-05 11-21
Ottumwa 29 1981-08-03 27 1984-09-29 10-24 11-08 11-24
Perry 32 1955-09-12 28 1974-09-22 10-09 11-03 11-10
Pocahontas 30 2007-09-15 28 1983-09-20 10-07 10-28 11-05
Primghar 31 1984-09-15 27 1991-09-19 10-09 11-02 11-08
Red Oak 32 1993-09-15 28 1995-09-22 10-18 11-04 11-20
Rock Rapids 31 1974-09-03 26 1894-09-10 10-06 10-24 11-03
Rockwell City 32 1902-09-12 28 1929-09-18 10-17 11-02 11-10
Sac City 32 1974-09-03 27 1974-09-22 10-10 11-02 11-11
Shenandoah 30 1980-09-17 26 1983-09-23 10-19 11-05 11-20
Sibley 30 1974-09-03 23 1955-09-11 10-04 10-26 11-03
Sidney 30 1991-09-19 28 1995-09-22 10-27 11-05 11-24
Sigourney 31 1995-09-22 28 1964-09-28 10-19 11-05 11-21
Sioux City 32 2007-09-15 25 1995-09-22 10-10 11-02 11-08
Sioux Rapids 31 1974-09-03 28 1991-09-19 10-09 10-29 11-06
Storm Lake 32 1902-09-12 28 1929-09-18 10-17 11-02 11-08
Tipton 32 1902-09-13 28 1991-09-20 10-19 11-05 11-21
Toledo 31 2007-09-15 28 1962-09-20 10-10 11-03 11-10
Tripoli 31 2007-09-15 27 1974-09-22 10-10 11-03 11-10
Vinton 32 1953-09-13 28 1982-09-21 10-10 11-03 11-20
Washington 30 1902-09-13 28 1983-09-23 10-24 11-08 11-22
Waterloo 32 1917-09-11 28 1929-09-18 10-13 11-02 11-10
Waukon 32 1956-09-20 27 1984-09-26 10-10 11-02 11-09
Webster City 30 1955-09-11 25 1929-09-18 10-13 11-02 11-10
Williamsburg 31 1955-09-12 28 1991-09-20 10-18 11-04 11-20
Winterset 31 1955-09-12 28 1962-09-20 10-18 11-04 11-10