Pennsylvania One Call System is open 24 hours a day, 365 days a year. This includes all state holidays. The following are the state holidays that will not be included in the calculation of the three business days notice.
| Pennsylvania State Holidays | 2023 |
| New Years Day | January 2* |
| Martin Luther King, Jr. Day | January 16 |
| President's Day | February 20 |
| Memorial Day | May 29 |
| Juneteenth National Independence Day | June 19 |
| Independence Day | July 4 |
| Labor Day | September 4 |
| Columbus Day/Indigenous Peoples Day | October 9 |
| Veteran's Day | November 10* |
| Thanksgiving Day | November 23 |
| Day after Thanksgiving | November 24 |
| Christmas Day | December 25 |
| *Observed Date | |