Since St. Patrick's Day is not considered to be a federal holiday, USPS regular services are available. Here are the USPS 2017 Postal Holidays:
Monday, January 2 New Year’s Day (observed)
Monday, January 16 Martin Luther King Jr. birthday
Monday, February 20 Washington’s Birthday
Monday, May 29 Memorial Day
Tuesday, July 4 Independence Day
Monday, September 4 Labor Day
Monday, October 9 Columbus Day
Friday, November 10 Veterans Day (observed)
Thursday, November 23 Thanksgiving Day
Monday, December 25 Christmas Day
Know your options for mailing and choose the services that are best for you with USPS' A Customer's Guide to Mailing.
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You've put a lot of thought and care into what you are sending. Follow top tips for sending mail featured at An Post.