The Quick Answer
Most of Mexico, including Mexico City, Guadalajara and Monterrey, is on Central Standard Time (UTC−6) all year. Mexico abolished daylight saving time in October 2022, so its clock no longer moves; the gap with the United States still changes twice a year because the US side does.
While the US is on daylight time (March to November), Mexico City is 1 hour ahead of Los Angeles, level with Denver, 1 hour behind Chicago and 2 hours behind New York. On US standard time (November to March) it is 2 hours ahead of Los Angeles, 1 hour ahead of Denver, level with Chicago and 1 hour behind New York. The practical result: from anywhere in the continental US, almost the whole working day overlaps, and the only question is lunch.
Best Calling Windows by US Time Zone
Mexican working hours run roughly 9:00 to 18:00, with the main meal between about 14:00 and 16:00; a call at 14:30 Mexico City time reaches a lunch table, not a desk. Evenings are social and late. These windows avoid lunch and land before 21:00 on the Mexican side.
| You are in | US daylight time (Mar–Nov) | US standard time (Nov–Mar) |
|---|---|---|
| New York (Eastern) | 11:00–15:30 or 18:00–22:00 your time → 9:00–13:30 or 16:00–20:00 in Mexico City | 10:00–14:30 or 17:00–21:00 your time → 9:00–13:30 or 16:00–20:00 |
| Chicago (Central) | 10:00–14:30 or 17:00–21:00 → 9:00–13:30 or 16:00–20:00 | 9:00–13:30 or 16:00–20:00 → same hour |
| Denver (Mountain) | 9:00–13:30 or 16:00–20:00 → same hour | 8:00–12:30 or 15:00–19:00 → 9:00–13:30 or 16:00–20:00 |
| Los Angeles (Pacific) | 8:00–12:30 or 15:00–19:00 → 9:00–13:30 or 16:00–20:00 | 7:00–11:30 or 14:00–18:00 → 9:00–13:30 or 16:00–20:00 |
The Exceptions: Border Cities, Cancún and Sonora
Three parts of Mexico do not follow the national rule, and they are exactly the places Americans call most.
- Border municipalities (Tijuana, Mexicali, Ciudad Juárez, Nuevo Laredo, Reynosa, Matamoros and others along the US line) kept daylight saving time to stay in step with their US twin cities. Tijuana follows Los Angeles exactly; Ciudad Juárez follows El Paso. If you are calling across the border, assume the same time as the US city opposite.
- Quintana Roo (Cancún, Playa del Carmen, Tulum) is on UTC−5 all year, one hour ahead of Mexico City. In the US summer it matches New York; in the US winter it is one hour ahead of New York.
- Sonora (Hermosillo) is on UTC−7 all year, like Arizona, which it borders. It is one hour behind Mexico City.
- Baja California Sur (Los Cabos, La Paz) is on UTC−7 all year; Chihuahua outside the border zone is on UTC−6.
The Time Zone Planner knows these zones individually; pick the actual city rather than “Mexico”.
Clock-Change Dates to Watch
Because only the US side moves, the gap jumps twice a year on the US dates: the second Sunday in March and the first Sunday in November. In 2026 those are March 8 and November 1; in 2027, March 14 and November 7. A weekly call fixed in US time will land an hour earlier or later in Mexico after each change; fix it in Mexico City time instead if the person you call is the one with the tighter schedule.
Holidays and Busy Periods
Avoid business calls during Semana Santa (Holy Week, the week before Easter, with the following week also quiet), and expect slow replies from December 12 (Our Lady of Guadalupe) through January 6 (Three Kings’ Day), a stretch Mexicans call the Guadalupe–Reyes marathon. Statutory holidays include Constitution Day (first Monday in February), Benito Juárez’s birthday (third Monday in March), May 1, Independence Day on September 16, Revolution Day (third Monday in November) and Christmas. Día de Muertos on November 1 and 2 is not a statutory holiday but is widely observed; a personal call on those days is welcome, a sales call is not. More in the Mexico culture guide.
A Worked Example
You are in Los Angeles and want a relaxed evening call with family in Guadalajara on a Sunday in December. US standard time applies, so Guadalajara is 2 hours ahead. Their 19:30, after the main meal and before the late evening, is your 17:30. In July the same call would be at your 18:30, because the gap shrinks to 1 hour. If the family were in Cancún instead, add another hour: their 19:30 is your 16:30 in December.
Common Mistakes
- Assuming Mexico changed its clocks with the US. Since 2022 it has not. A standing call set in US time drifts by an hour twice a year on the Mexican side.
- Calling at 14:30 Mexico time. That is the start of the main meal almost everywhere in the country; expect the call to be short or unanswered. Before 13:30 or after 16:00 is the rule.
- Treating Cancún as Mexico City time. Quintana Roo is an hour ahead; hotel and tour confirmations use local time.
- Using Tijuana time for the rest of Baja. Tijuana follows California including daylight saving; Los Cabos, at the other end of the peninsula, does not.
- Booking a Monday-morning business call on a long weekend. Several Mexican holidays are observed on Mondays by law, so check the Mexico guide before the first Monday of February, the third Monday of March and the third Monday of November.
Tips for the Call Itself
- Mexican mobile numbers are dialled from the US as +52 followed by the ten-digit number; the old “1” after +52 for mobiles is no longer needed.
- WhatsApp is the default channel for most personal and many business contacts; a text to arrange the call before dialling is normal and expected.
- Greetings matter: a short “¿Cómo está la familia?” before business is courtesy, not small talk. The Language Helper has the basics.