When people look at a map of the Lone Star State, they often assume a uniform clock ticks across its vast expanse. Yet, the reality of what time is it in Texas is split across two distinct zones. While massive hubs like Houston, Dallas, and Austin operate on Central Time, the far western edge of the state marches to a different beat entirely. Understanding this geographical quirk prevents missed flights, botched phone calls, and scheduling errors when doing business across state lines.
Most of Texas—roughly 95 percent of its landmass and the vast majority of its population—observes Central Time (CT). This includes major metropolitan areas like San Antonio, Fort Worth, El Paso's neighbors to the east, and the state capital. However, the far western corner operates on Mountain Time (MT). This split means that traveling from San Antonio to El Paso requires turning your watch back an hour, even though you never leave the state.
The Geography of Texas Time Zones
The division of time across Texas is dictated by federal boundaries and historical trade alignments rather than arbitrary lines. The state is officially split between the Central and Mountain time zones, creating a localized border within the state itself.
According to data from the National Institute of Standards and Technology, standard time zones in the United States are legally defined by federal law and managed by the Department of Transportation. In Texas, this federal oversight results in a clean split affecting only a tiny fraction of the state's total counties.
Counties on Mountain Time
Only two full counties and a small fraction of a third county observe Mountain Time in Texas:
- El Paso County: Home to the city of El Paso, this westernmost urban center aligns with Mountain Time due to its economic and geographic ties to New Mexico and Ciudad Juárez.
- Hudspeth County: Situated directly east of El Paso County, this sparsely populated region shares the Mountain Time designation.
- Culberson County: Only the northwestern portion of Culberson County, near the Guadalupe Mountains National Park, officially observes Mountain Time, while the rest of the county observes Central Time.
Why Texas Is Split Into Two Time Zones
The historical roots of the Texas time split stretch back to the era of railroad expansion. Before standard time zones were established in the late 19th century, cities set their clocks based on local solar noon. As railroads connected distant towns, maintaining hundreds of different local times became untenable.
When the federal government first drew official time zone boundaries, western Texas naturally gravitated toward the Mountain zone because of its distance from commercial centers like Chicago and St. Louis. Over the decades, several attempts were made to unify the entire state under Central Time. In the early 1920s, parts of West Texas temporarily shifted to Central Time, but local resistance, commercial alignment with New Mexico, and community lobbying quickly pushed those western counties back to Mountain Time.
The Uniform Time Act of 1966 cemented these boundaries, locking in the current layout where El Paso and its immediate neighbors remain an hour behind the rest of the state.
Daylight Saving Time Observations
Both regions of Texas observe Daylight Saving Time (DST), meaning the one-hour offset between Central and Mountain time remains constant year-round.
- Central Standard Time (CST) shifts to Central Daylight Time (CDT) in the spring.
- Mountain Standard Time (MST) shifts to Mountain Daylight Time (MDT) on the exact same days.
Because both zones spring forward and fall back simultaneously, travelers don't have to worry about a shrinking or expanding time gap when moving between Houston and El Paso. The difference is always strictly sixty minutes. For official tracking of federal time changes, consult the U.S. Naval Observatory.
Practical Complications for Travelers and Businesses
Living near a time zone border creates unique everyday challenges. For example, residents of El Paso frequently work, shop, or commute across state lines into New Mexico (which is entirely on Mountain Time) or across the international border into Ciudad Juárez, Mexico.
Ciudad Juárez observes Central Time during standard periods, which historically created a fascinating quirk: during parts of the year, El Paso was an hour behind its immediate international twin city. While policy changes in Mexico have altered how border cities handle Daylight Saving Time in recent years, cross-border commuters still have to double-check meeting times carefully.
Common mistakes include:
- Assuming statewide event schedules apply universally across all Texas counties.
- Booking flights or bus departures out of El Paso International Airport using Central Time instead of local Mountain Time.
- Scheduling remote client calls from Austin to El Paso without accounting for the one-hour lag.
Frequently Asked Questions
Does El Paso share a time zone with Dallas?
No. Dallas is in the Central Time Zone, while El Paso is in the Mountain Time Zone. El Paso is one hour behind Dallas.
How many counties in Texas do not use Central Time?
Only two counties (El Paso and Hudspeth) are entirely on Mountain Time, alongside a small sliver of Culberson County. All other 251 Texas counties observe Central Time.
Do Texas time zones observe Daylight Saving Time?
Yes, every county in Texas observes Daylight Saving Time, shifting forward in March and back in November in unison.
What is the time difference between Houston and El Paso?
Houston is on Central Time and El Paso is on Mountain Time, making Houston exactly one hour ahead of El Paso year-round.
