After a warm start to October, cooler air began to filter down into the Missouri Valley region. A day plus prior, late on the 10th and into the 11th, a cold front slid through the state, dropping temperatures a solid 10 to 15 degrees. While that itself only put the state into the 40s and upper 30s, it also allowed cooler and drier air to continue to filter in. By the evening of the 12th, the parent low pressure system to the aforementioned cold front remained rooted in northern Minnesota and deepened, yielding southwesterly winds across Iowa. Even with the southerly flow, dew points in the low to mid 20s and mostly clear skies allowed temperatures to drop below freezing statewide. The coldest temperatures, into the mid and uppe 20s, were seen in the valley areas such as the Nishnabotna. The remainder of the state did manage to drop to around 30.

Frost/Freeze in BLACK HAWK, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Frost/Freeze in TAMA, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in JASPER, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in HUMBOLDT, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in CARROLL, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in GREENE, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in CALHOUN, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in WEBSTER, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in WRIGHT, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in SAC, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in HAMILTON, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in CRAWFORD, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in BOONE, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in STORY, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Frost/Freeze in GUTHRIE, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in DALLAS, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in POLK, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Frost/Freeze in MADISON, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in CLARKE, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in WARREN, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in LUCAS, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in DECATUR, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in WAYNE, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in WORTH, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in BREMER, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in HARDIN, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in GRUNDY, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in CERRO GORDO, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Frost/Freeze in FRANKLIN, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in BUTLER, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in DAVIS, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in HANCOCK, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in POCAHONTAS, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in CASS, IOWA
From 11-OCT-19 22:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in ADAIR, IOWA
From 11-OCT-19 22:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in ADAMS, IOWA
From 11-OCT-19 22:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in PALO ALTO, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in POWESHIEK, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in MARION, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in KOSSUTH, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in WINNEBAGO, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in AUDUBON, IOWA
From 11-OCT-19 22:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in EMMET, IOWA
From 12-OCT-19 01:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Frost/Freeze in MONROE, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in WAPELLO, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in APPANOOSE, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in MAHASKA, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in UNION, IOWA
From 11-OCT-19 22:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in RINGGOLD, IOWA
From 11-OCT-19 22:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in TAYLOR, IOWA
From 11-OCT-19 22:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Frost/Freeze in MARSHALL, IOWA
From 12-OCT-19 03:00:00 to 12-OCT-19 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS