What reading level is The 91-story treehouse?

The 91-story treehouse by Andy Griffiths is at a Level 3-4 reading level. Recommended for Middle Grades readers (Ages 9-12).

What age is The 91-story treehouse appropriate for?

The 91-story treehouse is recommended for Ages 9-12. HootRating: 8C (Clear).

What genre is The 91-story treehouse?

The 91-story treehouse is fiction. Part of the Treehouse Books series.

Does The 91-story treehouse have any content warnings?

The 91-story treehouse has a HootRating of 8C (Clear). No specific content flags noted. On HootRated, every book is rated across four dimensions — emotional, physical, social, and thematic — to help parents make informed choices.

How many pages is The 91-story treehouse?

The 91-story treehouse by Andy Griffiths is 376 pages (approximately 14,458 words).

Reviewed by HootRated editorial · Last updated May 18, 2026

The 91-story treehouse

Andy Griffiths

The 91-story treehouse

Age Rating, Reading Level & Content Guide

Babysitting blunders!

by Andy Griffiths

Treehouse Books

Reading Level 3-4 8C Ages 9-12 Balanced Read Page-Turner

The text is written at a 3rd grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is gentle with no concerning themes.

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About This Book

Join Andy and Terry as they explore their incredible 91-story treehouse filled with wild inventions like a gigantic submarine sandwich shop, an air-traffic control tower, and a human pinball machine. Each level unlocks a new burst of hilarious adventures and imaginative fun that will keep you laughing and wondering what’s next! Perfect for readers who love humor and creativity in every corner.

Themes

HumorImaginationAdventure FriendshipCreativity

Quick Assessment

This is a Level 3-4 book with gentle content intensity. No notable content concerns flagged. Written for readers ages 9-12.

Why we rated The 91-story treehouse 8C

The 91-story treehouse is written at a Level 3-4 reading level across 376 pages (approximately 14,458 words). Strong independent readers around grade 4.2 can typically handle this book on their own; with parent or teacher support, The 91-story treehouse works for readers up to grade 5.2.

Read aloud, The 91-story treehouse runs about 1.6 hours — long enough to span several bedtime sessions.

We rate The 91-story treehouse as 8C ("Clear") because the content sits in the "Gentle" range — no conflict beyond everyday childhood experiences. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly gentle; no single dimension stands out as a concern.

No specific content flags were raised by community reviewers, which is consistent with the gentle intensity score.

Thematically, The 91-story treehouse explores humor, imagination, adventure, friendship, and creativity — these threads give the book room to mean different things to different readers.

Good fit for

✓ Children in the Ages 9-12 range — the maturity and attention span match the story's pacing.
✓ Reluctant readers who need fast-paced, hook-heavy stories to stay engaged.
✓ Kids drawn to stories about humor, imagination, adventure.
✓ Readers who fall hard for one book and want a long series to live in — there are 12 more books in the Treehouse Books series.