Frost dates · Iowa
When is the first frost in Sioux City?
Sioux City right now
33°FA few clouds
- Today41°F / 30°FClouds
- Tomorrow51°F / 27°FClear skies
- Monday54°F / 32°FClear skies
Gray sky, gray mood.
Live from OpenWeatherMap. Alerts from the National Weather Service.
In a typical year, Sioux City’s first frost comes around October 5 and its last around April 29.
One year in ten the first frost comes as early as September 22, and nine years in ten it has arrived by October 18. One year in ten the last frost is over as early as April 16, and nine years in ten it is over by May 14. Sioux City averages about 154 nights a year at 32°F or colder, with about 159 frost-free days in between in a typical year. It’s frost season here, and the last frost usually comes around April 29. That makes it the 15th earliest first frost of the 117 cities we track where it freezes most years.
Last updated
A freeze is in the forecast for the next 48 hours.
Sioux City’s first frost shows up in early October, before the corn has even finished saying goodbye.
Live 48-hour check from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Frost dates, early, typical and late years
| Early year (1 in 10) | Typical | Late year (1 in 10) | |
|---|---|---|---|
| First frost | September 22 | October 5 | October 18 |
| Last frost | April 16 | April 29 | May 14 |
A frost date here is a night when the official thermometer reads 32°F or colder. Frost on the ground can show up on clear, calm nights a few degrees milder.
Cities with about the same first frost
- Sioux Falls, South Dakota: first frost around October 6
- Yakima, Washington: first frost around October 4
- Billings, Montana: first frost around October 7
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00014943.