The Heroes of Olympus books in order
The Heroes of Olympus by Rick Riordan has 5 books, published 2010–2014. Reading all of them takes about 51 hours (2,772 pages). 4 can be borrowed free from Open Library.
Reading order
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Book 1 · 2010
The Lost Hero
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Book 2 · 2011
The Son of Neptune
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Book 3 · 2012
The Mark of Athena
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Book 4 · 2013
The House of Hades
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Book 5 · 2014
The Blood of Olympus
Questions people ask
How many The Heroes of Olympus books are there?
There are 5 books in the series, published 2010–2014.
Which The Heroes of Olympus book should I read first?
Start with The Lost Hero (2010), book 1. The list above is the reading order.
How long does it take to read the whole series?
About 51 hours at an average pace of 250 words a minute, or 2,772 pages in total. The longest book is The House of Hades at 597 pages.
Can I read The Heroes of Olympus for free?
4 books can be borrowed free from Open Library with a free account. The book pages have the links.