What reading level is the Casa del árbol; Magic Tree House: Merlin Missions series?

The Casa del árbol; Magic Tree House: Merlin Missions series by Mary Pope Osborne is at a Grades 3.1–3.6 reading level (average Grade 3.3). Intended for Lower Grades (Ages 5–8). There are 5 books in the series.

What order should I read the Casa del árbol; Magic Tree House: Merlin Missions books?

The Casa del árbol; Magic Tree House: Merlin Missions series has 5 books in order: 1. Carnaval a media luz, 2. El invierno del hechicero del hielo, 3. El verano de la serpiente marina, 4. La estación de las tormentas de arena, 5. La noche de los nuevos magos.

Casa del árbol; Magic Tree House: Merlin Missions Books in Order

5 books by Mary Pope Osborne. Reading level: Grades 3.1–3.6. Lower Grades (Ages 5–8).

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. Casa del árbol; Magic Tree House: Merlin Missions (5 books by Mary Pope Osborne) lands at reading level Grades 3.1–3.6, with average content intensity 1.6/5. 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

Grades 3.1–3.6

Reading Level

1.6/5

Avg. Intensity

Lower Grades

Content Intensity Across the Series

Consistent

Content stays at a steady intensity level throughout the series.

First book Latest book

Casa del árbol; Magic Tree House: Merlin Missions Reading Order

#	Title	Reading Level	Content
1	Carnaval a media luz Mary Pope Osborne	Level 3-4	Mild
2	El invierno del hechicero del hielo Unknown	Level 3-4	Mild
3	El verano de la serpiente marina Mary Pope Osborne	Level 3-4	Gentle
4	La estación de las tormentas de arena Mary Pope Osborne	Level 3-4	Mild
5	La noche de los nuevos magos Mary Pope Osborne	Level 3-4	Gentle

Level 3-4

Questions about the Casa del árbol; Magic Tree House: Merlin Missions series

What reading level is the Casa del árbol; Magic Tree House: Merlin Missions series?: The Casa del árbol; Magic Tree House: Merlin Missions series by Mary Pope Osborne is at a Grades 3.1–3.6 reading level (average Grade 3.3). Intended for Lower Grades (Ages 5–8). There are 5 books in the series.
What order should I read the Casa del árbol; Magic Tree House: Merlin Missions 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 Casa del árbol; Magic Tree House: Merlin Missions series appropriate for?: The Casa del árbol; Magic Tree House: Merlin Missions series is recommended for Lower Grades (Ages 5–8). The average content intensity is 1.6/5. 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.