What reading level is the Heroes of Olympus series?

The Heroes of Olympus series by Rick Riordan is at a Grade 4.7 reading level (average Grade 4.7). Intended for Middle Grades (Ages 9–12). There are 5 books in the series.

What order should I read the Heroes of Olympus books?

The Heroes of Olympus series has 5 books in order: 1. The Lost Hero, 2. The Son of Neptune, 3. The Mark of Athena, 4. The House of Hades, 5. The Blood of Olympus.

What age is the Heroes of Olympus series appropriate for?

The Heroes of Olympus series is recommended for Middle Grades (Ages 9–12). The average content intensity is 3/5.

Heroes of Olympus Books in Order

5 books by Rick Riordan. Reading level: Grade 4.7. Middle Grades (Ages 9–12).

Series books grow with readers — but that's also the trap. Most series start at one reading level and one content intensity and drift upward over the course of the run. Heroes of Olympus (5 books by Rick Riordan) lands at reading level Grade 4.7, with average content intensity 3/5. Intensity stays consistent across the series — a kid who can handle the first book can generally handle the rest.

The reading-order table below lists every book with per-volume reading level and intensity badges so you can spot any escalation before it catches your reader off guard. For a deeper dive into how we score text difficulty vs. emotional weight separately — and why series readers especially benefit from that split — see our methodology page.

Books

Grade 4.7

Reading Level

3/5

Avg. Intensity

Middle Grades

Content Intensity Across the Series

Consistent

Content stays at a steady intensity level throughout the series.

First book Latest book

Heroes of Olympus Reading Order

#	Title	Reading Level	Content
Book 1	The Lost Hero Rick Riordan	Level 4-5	Moderate
Book 2	The Son of Neptune Rick Riordan	Level 4-5	Moderate
Book 3	The Mark of Athena Rick Riordan	Level 4-5	Moderate
Book 4	The House of Hades Rick Riordan	Level 4-5	Moderate
Book 5	The Blood of Olympus Rick Riordan	Level 4-5	Moderate

Level 4-5

Questions about the Heroes of Olympus series

What reading level is the Heroes of Olympus series?: The Heroes of Olympus series by Rick Riordan is at a Grade 4.7 reading level (average Grade 4.7). Intended for Middle Grades (Ages 9–12). There are 5 books in the series.
What order should I read the Heroes of Olympus books?: The reading-order table above lists all 5 books with per-volume reading level and intensity ratings. Start with book 1 and read in publication order unless the table indicates a different recommended order for newer readers.
What age is the Heroes of Olympus series appropriate for?: The Heroes of Olympus series is recommended for Middle Grades (Ages 9–12). The average content intensity is 3/5. Check the intensity trajectory above to see whether content gets heavier across the series — if it does, sensitive readers may want to stop earlier in the run.