What time zone is Illinois in?

Illinois is primarily in the Central Daylight Time zone (CDT), currently UTC−05:00.

Does Illinois observe daylight saving time?

Yes. In 2026, clocks go forward around March 8 and back around November 1.

Chicago is the most populous city in Illinois.

§ 01United States · CDT

Illinois runs on Central Daylight Time (CDT), currently UTC−05:00. Its largest city is Chicago.

§ 02Time zone & daylight saving

Time zone: Central Daylight Time (CDT)
UTC offset: UTC−05:00
Largest city: Chicago
Daylight saving (2026): Yes. In 2026, clocks go forward around March 8 and back around November 1.

§ 03Time difference

New York−1 h

Chicagosame

Denver+1 h

Los Angeles+2 h

London−6 h

Tokyo−14 h

Hours are Illinois’s current offset relative to each city, daylight saving included.

§ 04Cities in Illinois

United States

§ 05Frequently asked

What time zone is Illinois in?: Illinois is primarily in the Central Daylight Time zone (CDT), currently UTC−05:00.
Does Illinois observe daylight saving time?: Yes. In 2026, clocks go forward around March 8 and back around November 1.
What is the largest city in Illinois?: Chicago is the most populous city in Illinois.