Monday Holidays in Latin America: Colombia, Argentina and Mexico

Assumption Day is 15 August. In Colombia in 2027, offices close on Monday 16 August instead. Columbus Day, 12 October, falls on a Tuesday, but the Colombian day off is Monday 18 October, almost a week later. If your calendar shows the traditional dates, it will be wrong for most of Colombia's holidays. The same principle, applied with different rules, shapes holidays in Argentina and Mexico.

Colombia: the Ley Emiliani

Colombia's Law 51 of 1983, known as the Ley Emiliani after the senator who promoted it, moves a set of holidays to the following Monday whenever they do not already fall on a Monday. The aim was to create long weekends and support domestic tourism.

The holidays it moves include:

• Epiphany (6 January)
• Saint Joseph's Day (19 March)
• Saints Peter and Paul (29 June)
• Assumption (15 August)
• Día de la Raza (12 October)
• All Saints' Day (1 November)
• Independence of Cartagena (11 November)

The Easter-linked holidays of Ascension, Corpus Christi and Sacred Heart are also observed on Mondays. Holidays that do not move include New Year's Day, Maundy Thursday, Good Friday, Labour Day (1 May), Independence Day (20 July), the Battle of Boyacá (7 August), the Immaculate Conception (8 December) and Christmas Day. If one of those falls on a weekend, it is not moved.

Worked example: Colombia in 2027

Western Easter is on 28 March 2027. Applying the Ley Emiliani rules gives the following.

That gives ten Monday holidays. Add the eight fixed holidays and Colombia has 18 public holidays in 2027. Of the fixed ones, New Year's Day is a Friday, Maundy Thursday and Good Friday fall on 25 and 26 March, Independence Day is a Tuesday and the Immaculate Conception a Wednesday. Labour Day, the Battle of Boyacá and Christmas all fall on Saturdays.

So 15 of the 18 holidays remove a weekday, and the year contains at least eleven three-day weekends (ten Mondays plus New Year's Day) and a four-day Easter weekend. The page lays them out, and the Colombia public holidays page shows the full calendar.

A practical consequence is that the Monday after a holiday weekend is rarely a good day for a deadline in Colombia. Count forward with the add business days tool rather than assuming the traditional date.

Argentina: holidays in categories

Argentina's system, set out in Law 27,399 of 2017, sorts holidays into categories:

• Fixed holidays (inamovibles), which stay on their date, such as 25 May and 9 July.
• Movable holidays (trasladables), which can shift to a Monday. Under the general rule, a movable holiday falling on a Tuesday or Wednesday moves to the previous Monday, and one falling on a Thursday or Friday moves to the following Monday.
• Bridge holidays for tourism (feriados con fines turísticos), which the national government can designate each year, up to a set maximum, to create long weekends.
• Non-working days (días no laborables), where employers decide whether staff work.

The movable group includes 17 June (Güemes), 17 August (San Martín), 12 October (Day of Respect for Cultural Diversity) and 20 November (National Sovereignty). Under the general rule, 17 August 2027, a Tuesday, would move back to Monday 16 August, and 12 October 2027, also a Tuesday, would move to Monday 11 October. Güemes has its own variant of the rule, and the government has in some years changed the arrangements by decree, so check the official calendar for each year on the Argentina public holidays page before relying on these.

The bridge days are announced in advance but not fixed by formula. They are the part of Argentina's calendar most likely to catch out planners from other countries.

Mexico: fixed Mondays

Mexico takes a simpler approach. Since a 2006 reform of the Federal Labour Law, three holidays are observed on set Mondays:

• Constitution Day: the first Monday in February
• Benito Juárez's birthday: the third Monday in March
• Revolution Day: the third Monday in November

This works like the US approach of fixing holidays to a given Monday of the month. The Mexico public holidays page has the current dates.

Why the moves matter for cross-border work

Monday holiday rules are good for long weekends and tourism, but they shift the working week in ways that matter to anyone outside the country. A team in Bogotá that is off on ten Mondays a year loses a disproportionate share of start-of-week meetings, sprint planning sessions and weekly reporting slots. If your organisation runs a recurring Monday stand-up or a Monday payroll cut-off, those will regularly collide with Colombian holidays.

Moved holidays also confuse anyone reading a calendar from abroad. A colleague who knows that 12 October is a holiday in much of the Americas may plan around Tuesday 12 October 2027, only to find the Colombian office working that day and closed on Monday 18 October instead. In Argentina, under the general rule, the same holiday would move back to Monday 11 October, so the two countries can be closed a week apart for the same occasion. When one recurring meeting has to suit several countries, a midweek slot is far less likely to hit a holiday.

Planning checklist for Latin American calendars

1. Never copy traditional holiday dates into a schedule; use the observed day for each country and year.
2. In Colombia, expect around ten Monday holidays a year and avoid Monday deadlines.
3. In Argentina, check each year's official calendar for movable holidays and tourism bridge days.
4. In Mexico, record the three Monday holidays by rule rather than by date.
5. Recount cross-border deadlines whenever a team in one of these countries is involved, since a Monday off in Bogotá is a working Monday in most other places.