Is Houston CST or CDT? Time Zone Explained

Houston's Time Zone: CST and CDT

Houston, Texas is located in the Central Time Zone. The city alternates between two designations throughout the year:

• CST (Central Standard Time): UTC−6:00, observed from the first Sunday of November to the second Sunday of March
• CDT (Central Daylight Time): UTC−5:00, observed from the second Sunday of March to the first Sunday of November

Right now, Houston is on CDT, which means the UTC offset is UTC−5:00.

Is All of Texas in the Central Time Zone?

Almost all of Texas is in the Central Time Zone, including Houston, Dallas, Austin, San Antonio, and Fort Worth. The one exception is El Paso and far western Texas (Hudspeth County), which observe Mountain Time (MST/MDT), one hour behind Central Time.

Cities That Share Houston's Time Zone

Houston is in the same time zone as many major US cities:

• Chicago, Illinois — America's third-largest city
• Dallas, Texas — Houston's in-state neighbor (time comparison)
• San Antonio, Texas — also Central Time
• Nashville, Tennessee — Music City is in sync with Houston
• New Orleans, Louisiana — same time as Houston year-round
• Milwaukee, Wisconsin — Central Time Zone

Houston Time vs Other US Time Zones

• Eastern Time (EST/EDT): 1 hour ahead — CST to EST converter
• Pacific Time (PST/PDT): 2 hours behind — CST to PST converter
• Mountain Time (MST/MDT): 1 hour behind
• Alaska Time (AKST): 3 hours behind
• Hawaii Time (HST): 4–5 hours behind — Houston vs Honolulu

Why "America/Chicago" and Not "America/Houston"?

The IANA time zone database (used by computers worldwide) uses America/Chicago as the identifier for the US Central Time Zone. Chicago was chosen as the representative city because IANA convention picks the largest city in each zone at the time of database creation. Houston, Dallas, and all other Central Time Zone cities share this identifier.

How Houston's Time Zone Affects Daily Life

Houston's Central Time Zone placement has practical effects on daily life. TV schedules in Houston follow the "8/7 Central" convention — prime-time shows listed at 8 PM EST air at 7 PM locally. NFL games with 1 PM EST kickoffs start at noon in Houston, and Monday Night Football at 8:15 PM EST is 7:15 PM CST.

The stock market opens at 8:30 AM Houston time (9:30 AM EST) and closes at 3:00 PM (4:00 PM EST), giving Houston-based traders and investors a slightly earlier start to their trading day. Cryptocurrency markets and forex trading, which run 24/7, use UTC as the reference — Houston is UTC−6 (CST) or UTC−5 (CDT).

For travelers, Houston's two airports (IAH and HOU) list all departure and arrival times in Central Time. A direct flight to London departing at 4 PM CST arrives the next morning in GMT — roughly 10 hours later but appearing as a 16-hour jump on the clock due to the time zone difference.

Houston Time Zone History

The Central Time Zone was established by US railroads in 1883 as part of the four standard time zones. Before standardization, each city kept its own local solar time — Houston noon was slightly different from Dallas noon. The railroads needed consistent schedules, so they divided the country into four zones based roughly on 15-degree longitude increments from Greenwich, England.

Congress made these time zones official with the Standard Time Act of 1918, which also introduced daylight saving time. Houston has been in the Central Time Zone ever since, anchored by its longitude of approximately 95.4°W — well within the Central zone's range of roughly 82.5°W to 97.5°W.

Useful Tools

Check what time it is in Houston right now, use our time zone converter, or see daylight saving time details. For side-by-side comparisons, try Houston vs world cities.