Time:
* Summer: The book unfolds over a few weeks during the summer, spanning from the end of June to early August.
* 2009: The book was published in 2009 and the events within the story are meant to be occurring in the same year.
Place:
* New York City: The majority of the book takes place in and around New York City, particularly in Manhattan.
* Camp Half-Blood: There are key scenes that take place at the demigod training camp in Long Island.
* Mount Olympus: The climax of the book occurs on Mount Olympus, the home of the Greek gods.
While the story primarily focuses on New York City, it also touches upon other locations like:
* Camp Jupiter: The Roman demigod camp in San Francisco.
* The Underworld: The land of the dead is briefly visited by Percy in the book.