Frost dates · Iowa
When is the first frost in Waterloo?
Waterloo right now
35°FClear skies
- Today41°F / 28°FClear skies
- Tomorrow47°F / 26°FClear skies
- Monday50°F / 30°FClear skies
Blue sky. Suspiciously nice.
Live from OpenWeatherMap. Alerts from the National Weather Service.
In a typical year, Waterloo’s first frost comes around October 10 and its last around April 27.
One year in ten the first frost comes as early as September 26, and nine years in ten it has arrived by October 21. One year in ten the last frost is over as early as April 11, and nine years in ten it is over by May 10. Waterloo averages about 151 nights a year at 32°F or colder, with about 165 frost-free days in between in a typical year. It’s frost season here, and the last frost usually comes around April 27. That makes it the 21st 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.
Waterloo freezes on about 150 nights a year, which is a lot of commitment from one Iowa city.
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 26 | October 10 | October 21 |
| Last frost | April 11 | April 27 | May 10 |
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
- Madison, Wisconsin: first frost around October 10
- Binghamton, New York: first frost around October 11
- Denver, Colorado: first frost around October 9
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00094910.