Overview
A "leap year starting on Friday" is a year in the Gregorian calendar that has 366 days and whose January 1 occurs on a Friday. In this configuration the extra day, February 29, falls on a Monday. The arrangement determines the weekday of every date that year and produces a characteristic pattern of weekday-date combinations that is useful for planners, historians, and software that generates calendars.
Key characteristics
Because of the way weekdays shift through a leap year, a leap year that starts on Friday has a distinctive set of features:
- It contains exactly one occurrence of Friday the 13th, which falls in May.
- February 29 is on a Monday, moving subsequent dates in the year one weekday forward compared with a non-leap year beginning on the same weekday.
- Some fixed-date holidays fall on predictable weekdays—Christmas on a Sunday and Independence Day (July 4) on a Monday in this arrangement.
Holiday and civic-date placements
In countries that observe U.S.-style federal holidays and similar movable observances, a leap year that starts on Friday places several holidays on their earliest or particular weekdays. Typical placements include:
- Martin Luther King Jr. Day: third Monday in January — January 18
- Valentine's Day: Sunday
- Presidents' Day: earliest possible date — February 15
- St. Patrick's Day: Thursday
- Mother's Day: earliest possible date — May 8
- Memorial Day: last Monday in May — May 30
- Father's Day: June 19
- Labor Day: September 5
- Columbus Day: October 10
- Halloween: Monday
- Veterans Day: Friday
- Thanksgiving: November 24
- Christmas: Sunday
Examples and repetition
Examples of leap years that begin on a Friday include 1904, 1932, 1960, 1988, and 2016. Future occurrences follow the rules of the Gregorian calendar: while some patterns appear to repeat every 28 years in isolation, the Gregorian system repeats in a 400-year cycle, so the sequence of which exact years share this property follows that longer cycle. Other examples in the 21st century are 2044 and 2072 as members of the same family of year-types.
Relations and notable facts
This leap-year pattern is one of three leap-year starting weekdays that result in only one Friday the 13th; the other two are the leap year starting on Tuesday and the leap year starting on Saturday (Tuesday-start, Saturday-start). The single Friday the 13th in these leap-year types always occurs in May. A similar trait—one Friday the 13th in May—appears in a common year that starts on Saturday (Common year starting on Saturday).
Why it matters
Understanding the layout of a leap year that begins on Friday helps with long-term planning, scheduling recurring events, and interpreting historical dates. Calendar algorithms, archival work, and computational date libraries use these fixed patterns to map dates to weekdays reliably. For readers seeking more detail, introductory material on what constitutes a leap year and how weekday cycles operate can provide the arithmetic background behind these patterns; similarly, a general reference on Friday explains cultural associations sometimes linked to Friday the 13th.
Further reading and external references are available via linked year examples and descriptions above.