| 1/1/1988, Fri | New Year's Day |
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| 1/11/1988, Mon | Epiphany Obs: Actual Observance Day |
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| 3/21/1988, Mon | St. Joseph's Day Obs: Actual Observance Day |
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| 3/27/1988, Sun | Palm Sunday |
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| 3/31/1988, Thu | Maundy Thursday |
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| 4/1/1988, Fri | Good Friday |
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| 4/2/1988, Sat | Holy Saturday |
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| 4/3/1988, Sun | Easter |
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| 5/1/1988, Sun | Labor Day |
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| 5/16/1988, Mon | Ascension Obs: Actual Observance Day |
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| 6/6/1988, Mon | Corpus Christi Obs: Actual Observance Day |
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| 6/13/1988, Mon | Sacred Heart Obs |
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| 7/4/1988, Mon | St. Peter-St. Paul Day Obs: Actual Observance Day |
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| 7/20/1988, Wed | Independence Day |
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| 8/7/1988, Sun | Battle of Boyaca |
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| 8/15/1988, Mon | Assumption Obs |
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| 10/17/1988, Mon | Hispanity Day Obs: Actual Observance Day |
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| 11/7/1988, Mon | All Saints' Day Obs: Actual Observance Day |
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| 12/8/1988, Thu | Immaculate Conception |
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| 12/24/1988, Sat | Christmas Eve |
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| 12/25/1988, Sun | Christmas Day |
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| 12/31/1988, Sat | New Year's Eve |
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