For a state that looks like it should sit comfortably in one time zone, Indiana has had one of the most tangled time zone histories in the country — and it's a more recent story than most people assume. Indiana didn't fully adopt Daylight Saving Time statewide until 2006.
Split in two, geographically
Indiana today is divided between two time zones. Most of the state — including Indianapolis, Fort Wayne, Bloomington, and South Bend — uses Eastern Time. A band of counties in the northwest (near Chicago) and southwest (near Evansville) uses Central Time instead, largely because those areas' economic and social ties run toward Chicago and the Central time zone rather than toward the rest of Indiana.
The decades before 2006
Before 2006, Indiana's relationship with Daylight Saving Time was, for lack of a better word, inconsistent. Rather than the whole state observing DST together, only a handful of counties — around 10 of them, mostly near state borders where matching a neighboring state's clock mattered for daily business — observed the seasonal time change. The rest of the state stayed on standard time year-round, similar to how Arizona and Hawaii do today.
This created a genuinely confusing situation for anyone doing business across county lines within Indiana itself: depending on the time of year, two counties that were normally on the same clock could be an hour apart from each other, purely because one observed DST and the neighboring one didn't.
What changed in 2006
In 2006, Indiana adopted statewide Daylight Saving Time observance for the first time, ending the county-by-county patchwork. This didn't change which counties used Eastern versus Central time — that geographic split remains today — but it did mean that, within each of those two zones, every county now moves its clocks together, on the same schedule as the rest of the country.
What this means today
- Indiana is genuinely split between Eastern and Central time, based on county — not a state-wide single zone.
- Unlike the pre-2006 era, every part of Indiana now observes Daylight Saving Time on the standard national schedule — there's no longer a mix of DST and non-DST counties within the state.
- If you're dealing with a contact or business in Indiana, checking which specific city or county they're in still matters — Indianapolis and, say, Gary are in different time zones from each other despite both being in Indiana.
The split shows up in small, everyday ways for people who live near the boundary — a TV broadcast scheduled for "8pm" might mean something different depending on which side of the state you're on, and commuters who cross the line for work can find themselves gaining or losing an hour just driving to the office. It's also a common source of confusion for out-of-state businesses: a company might assume "Indiana" maps cleanly to one time zone, the way it would for a state like Ohio or Illinois, and get caught out scheduling a call with a Gary or Evansville office.
Because Indiana's split isn't obvious from the state's shape on a map, it's one of the more common sources of scheduling mix-ups in the Midwest. The time zone converter resolves this automatically by city rather than by state, so you don't have to remember which side of the line a particular Indiana city falls on.
Frequently asked questions
Is Indiana on Eastern or Central Time?
Both, depending on the county. Most of the state — including Indianapolis, Fort Wayne, Bloomington and South Bend — uses Eastern Time. A band of counties in the northwest near Chicago and the southwest near Evansville uses Central Time, because those areas' economic ties run toward Chicago.
When did Indiana start observing Daylight Saving Time statewide?
2006. Before that, only a minority of counties — mostly near state borders, where matching a neighbouring state's clock mattered for daily business — observed the seasonal change, while the rest of Indiana stayed on standard time all year. Statewide observance began with the 2006 law.
Do all Indiana counties change their clocks now?
Yes. Unlike the pre-2006 era, every part of Indiana now observes Daylight Saving Time on the standard national schedule, so there is no longer a mix of DST and non-DST counties within the state. Within each of the two time zones, every county moves together.
Are Indianapolis and Gary in the same time zone?
No — they are in different time zones despite both being in Indiana. That is why checking the specific city or county still matters when scheduling with an Indiana contact. Out-of-state businesses often assume “Indiana” maps to one zone and get caught out booking a call with a Gary or Evansville office.