What reading level is the Trials of Apollo series?

The Trials of Apollo 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 Trials of Apollo books?

The Trials of Apollo series has 5 books in order: 1. The Hidden Oracle, 2. The Dark Prophecy, 3. The Burning Maze, 4. The Tyrant's Tomb, 5. The Tower of Nero.

What age is the Trials of Apollo series appropriate for?

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

Trials of Apollo 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. Trials of Apollo (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

Trials of Apollo Reading Order

#	Title	Reading Level	Content
Book 1	The Hidden Oracle Rick Riordan	Level 4-5	Moderate
Book 2	The Dark Prophecy Rick Riordan	Level 4-5	Moderate
Book 3	The Burning Maze Rick Riordan	Level 4-5	Moderate
Book 4	The Tyrant's Tomb Rick Riordan	Level 4-5	Moderate
Book 5	The Tower of Nero Rick Riordan	Level 4-5	Moderate

Level 4-5

Questions about the Trials of Apollo series

What reading level is the Trials of Apollo series?: The Trials of Apollo 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 Trials of Apollo 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 Trials of Apollo series appropriate for?: The Trials of Apollo 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.