2024 Summer Calendar United States Opening Day. As the entirety of the united states lies in the northern hemisphere, the first day of summer comes on either 20 or 21 june. 2024 calendar with holidays and celebrations of the united states.
The school calendar dates in the united states are determined by the respective school districts within each state. 2024 calendar with holidays and celebrations of the united states. This page contains a national calendar of all 2024 federal and state holidays for the united states.