Alert archive / Illinois / Frost Advisories / 2026
Frost Advisories in Illinois, May 2026
5 frost advisories in May 2026. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of frost advisories reaches back to 2005.
Frost Advisories by county
Each county as a circle sized by its count in May 2026. Tap one for its archive.
- Frost Advisories
- 5
- Busiest day
- May 1, 20262 frost advisories
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 2:16 AM CDT | Frost Advisory | DVN | Bureau, Carroll, Henry, Jo Daviess, Mercer, Putnam and 3 more | 30 hr |
| May 1, 3:32 AM CDT | Frost Advisory | LOT | Boone, Cook, DeKalb, DuPage, Grundy, Iroquois and 10 more | 28 hr |
| May 6, 1:17 PM CDT | Frost Advisory | DVN | Bureau, Carroll, Henry, Jo Daviess, Putnam, Rock Island and 2 more | 19 hr |
| May 6, 1:23 PM CDT | Frost Advisory | LOT | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 8 more | 19 hr |
| May 10, 11:57 AM CDT | Frost Advisory | DVN | Jo Daviess, Stephenson | 19 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Jo Daviess County3
- Stephenson County3
- Bureau County2
- Carroll County2
- Henry County2
- Putnam County2
- Rock Island County2
- Whiteside County2
- Boone County2
- Cook County2
- DeKalb County2
- DuPage County2
- Grundy County2
- Kane County2
- Kendall County2
- Lake County2
- LaSalle County2
- Lee County2
- McHenry County2
- Ogle County2
- Will County2
- Winnebago County2
- Mercer County1
- Iroquois County1
- Kankakee County1
Nearby
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.