How many Friday the 13ths does 2026 have?

Question

1 January 2026 is a Thursday, and 2026 is not a leap year. How many Friday the 13ths are there in 2026, and in which months? Work it out from the month lengths, and say what the maximum possible number in any year is.

Accepted Answer

Three: 13 February, 13 March and 13 November. January. The 1st is a Thursday, so the 13th (12 days later, 12 = 7 + 5) is Thursday plus 5 = Tuesday. Stepping through the months. The 13th of each month is a fixed number of days after the previous month's 13th: the length of the previous month. Reduce those lengths modulo 7: January 31 (3), February 28 (0), March 31 (3), April 30 (2), May 31 (3), June 30 (2), July 31 (3), August 31 (3), September 30 (2), October 31 (3), November 30 (2). - 13 January: Tuesday. - 13 February: Tuesday + 3 = Friday. - 13 March: Friday + 0 = Friday. - 13 April: Frida…

How many Friday the 13ths does 2026 have?

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