The History of Time Zones in Texas and Houston

Before 1883, every city in America kept its own local time based on the position of the sun. Houston's noon was different from Dallas's noon by about 14 minutes. Train stations maintained dozens of clocks, each showing the time for a different city along the route.

This created dangerous confusion. Trains collided because conductors in different cities couldn't agree on the time. Passengers missed connections. The telegraph made the problem worse by enabling instant communication across distances that had previously required days of travel.

On November 18, 1883 — known as "The Day of Two Noons" — American railroads adopted four standard time zones. This wasn't a government decision; it was a private industry standard created by the General Time Convention (later the American Railway Association).

Texas was split between two zones: most of the state, including Houston, Dallas, San Antonio, and Austin, fell into Central Time. The western tip around El Paso was placed in Mountain Time, reflecting its closer alignment with cities like Denver and Albuquerque.

Houston, as a major railroad hub, adopted the new system immediately. The city's clocks were set back 18 minutes to align with the 90th meridian — the reference line for Central Time.

For 35 years, time zones were a voluntary convention. The Standard Time Act of 1918 finally made them federal law, also establishing daylight saving time as a wartime fuel-conservation measure. The law confirmed Texas's existing Central/Mountain split.

However, DST was deeply unpopular — especially among farmers who worked by sunlight, not clocks. Congress repealed mandatory DST in 1919, letting states choose. Texas went back and forth on DST for decades, with individual cities sometimes observing it while their neighbors didn't.

The patchwork DST situation became untenable. The Uniform Time Act of 1966 established that any state observing DST must do so uniformly across the state (with some exceptions for states split between time zones). Texas adopted statewide DST, and Houston has observed it consistently since then.

The current DST schedule — second Sunday in March to first Sunday in November — was set by the Energy Policy Act of 2005, extending DST by about four weeks compared to the previous schedule.

El Paso is one of the most fascinating time zone stories in America. Despite being in Texas, it observes Mountain Time (MT) because it's geographically and economically aligned with southern New Mexico and Ciudad Juárez, Mexico.

El Paso is closer to Los Angeles (800 miles) than to Houston (750 miles), and its business ties run west, not east. If El Paso used Central Time, it would be an hour ahead of its neighbor across the border — a daily headache for the hundreds of thousands of people who cross between the two cities.

In the modern IANA time zone database (used by every computer and smartphone), Houston's time zone is identified as America/Chicago. This might seem odd — Houston isn't Chicago — but the IANA system uses the largest city in each zone as the identifier.

Houston observes:

• CST (Central Standard Time): UTC−6:00, from early November to mid-March
• CDT (Central Daylight Time): UTC−5:00, from mid-March to early November

This means Houston spends roughly 8 months of the year on CDT and only 4 months on CST — daylight saving time is actually the "normal" state for most of the year.

Several bills have been introduced in the Texas Legislature to either lock the state permanently on CDT (staying on "summer time" year-round) or to adopt permanent CST. The Sunshine Protection Act passed the US Senate in 2022 but stalled in the House.

If permanent DST were adopted, Houston would be UTC−5 year-round — the same as Eastern Standard Time. Winter sunrises wouldn't occur until after 8:15 AM in late December, which concerns parents of school-age children. The debate continues.