The House Year · state by state
Illinois
102 counties in the data · Zones 5a–7a · ~83–150 freezing days a year
What Illinois does to a house
A state is a big place — these are the ranges, not averages. The county pages pin the numbers down.
- Climate
- Zones 5a–7a. Freezing days run from ~83 to ~150 a year depending on the county.
- First freeze
- Usually lands anywhere from October 9 to October 31 depending on the county.
- The air
- Runs from temperate to humid, county by county.
- The load
- Split duty: 64 counties lean heating, 0 lean cooling — the county page calls yours.
- Termites
- Light pressure as a state band.
- Radon
- EPA Zone 1 — the highest band — statewide. A one-time test settles it either way.
- Labor
- Labor sits near one level statewide — every price band on this site adjusts to the county anyway.
County pages in Illinois
- Cook CountyZone 6a · ~108 freeze days
- DuPage CountyZone 5b · ~134 freeze days
- Kane CountyZone 5b · ~139 freeze days
- Lake CountyZone 6a · ~128 freeze days
- Madison CountyZone 7a · ~93 freeze days
- McHenry CountyZone 5b · ~144 freeze days
- St. Clair CountyZone 7a · ~97 freeze days
- Will CountyZone 6a · ~126 freeze days
- Winnebago CountyZone 5b · ~148 freeze days
All 102 Illinois counties are in the data.The rest of the country →
A state is a big place.
This page is the wide shot. Your county narrows it, and the app builds the year for your exact house — your dates, your prices, your reminders.
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