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Indiana’s Time Zones and Daylight Saving Time

The state of Indiana, in the United States, has an interesting history regarding its time zones and daylight saving time (DST).

Counties in Indiana

Time zones within Indiana. Enlarge for key.

The Indiana counties marked in orange observe Central Time (CST/CDT), while the counties marked in blue observe Eastern Time (EST/EDT).

Indiana, which is known for its time zone debates, is currently split into two time zones. Each of Indiana’s 92 counties remained consistent in conforming to the state’s DST regulations each year since 2006. Moreover, most of Indiana’s 92 counties have remained in the Eastern Time (EST/EDT) from 2006 onwards.

Law Ends Daylight Saving Confusion

All counties in Indiana currently observe daylight saving time. However, this state has a controversial history regarding daylight saving time. Most of Indiana did not observe daylight saving time prior to 2006. Some counties, such as Floyd, Clark, and Harrison, observed daylight saving time while other counties did not.

To avoid further confusion, a bill was passed in 2005 to ensure that the entire state would observe daylight saving time from April 2006 onwards, regardless of which time zone the counties followed. However, this law did not stop residents and officials from debating as to whether the state should follow Central Time (CST/CDT) or Eastern Time (EST/EDT).

Indiana is currently split into two time zones. The official dividing line between the Eastern and Central time zones has progressively moved west from the Indiana-Ohio border to the Indiana-Illinois border.

The Daylight Saving Debate

Many parts of rural Indiana, predominantly farmers, oppose daylight saving time because their days are controlled by the sun instead of the clock. Some farmers believe that their productivity is at stake because they are missing one extra hour of sunlight in the morning.

Research from the University of California showed that having the entire state to switch to daylight saving time would cost Indiana households about $8.6 million in electricity bills each year. The study also estimated social costs of increased pollution emissions that ranged from $1.6 to $5.3 million per year. Moreover, the reduced cost of lighting in afternoons during daylight-saving time was offset by higher air-conditioning costs on hot afternoons and increased heating costs on cool mornings.

From the moment daylight saving time was observed by every county in 2006, most of Indiana’s 92 counties have remained in the Eastern Time (EST/EDT).

Time Zone Differences

Ever since the Standard Time Act positioned Indiana in the Central time zone in 1918, there has always been dispute or disagreement about what was considered the “official time” within the state. The Interstate Commerce Commission divided Indiana between the Eastern and Central time zones in 1961, but the new time zone line was not consistently observed. The state’s counties varied in observing different time zones in the 1960s and 1970s. A few counties switched to different time zones from the late 1970s onwards.

On January 18, 2006, the United States Department of Transportation announced a final rule that would change the clock for eight of 17 Indiana counties seeking to move to the Central Standard Time. These counties, which included the Starke, Pulaski, Daviess, Dubois, Knox, Martin, Perry and Pike counties, moved to the Central Standard Time on April 2, 2006, when the nation switched to daylight saving time.

Five of these counties, including Daviess, Dubois, Knox, Martin, and Pike, returned to the Eastern Standard Time in November 2007. By then, 80 of Indiana's 92 counties follow the Eastern Standard Time and only 12 counties observed the Central Standard Time. However, a bill was approved by the Indiana House committee in January 2008 for a referendum to allow residents of any county located near the Eastern-Central boundary vote the time they wanted to observe. It is likely that debates, disagreements and discussions over time zones and daylight saving time in Indiana will continue in the future.

Topics: Time Zone, Daylight Saving Time

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