Below are listed Public Holidays for the January 2009-December 2010 period.

2009
1 Jan New Year's Day. 
10-13 Apr Easter.
11 Apr Juan Santamaría's Day.
1 May Labour Day.
25 Jul Guanacaste Annexation.
2 Aug Virgin of Los Angeles, Feast of Patroness of Costa Rica*.
15 Aug Mothers' Day and Assumption.
15 Sep Independence Day.
12 Oct Dia de la Raza (Columbus Day)*.
25 Dec Christmas Day.

2010
1 Jan New Year's Day. 
2-5 Apr Easter.
10 Apr Juan Santamaría's Day.
1 May Labour Day.
25 Jul Guanacaste Annexation.
2 Aug Virgin of Los Angeles, Feast of Patroness of Costa Rica*.
15 Aug Mothers' Day and Assumption.
15 Sep Independence Day.
11 Oct Dia de la Raza (Columbus Day)*.
25 Dec Christmas Day.

* Not legally binding.

Most businesses close for the whole of Holy Week and between Christmas and New Year.