Horrible Harry Books in Order
Horrible Harry is an 18-book series by Suzy Kline for ages 5–8, at a grades 2–4 reading level, with gentle to moderate content (HootRated intensity 1–3 out of 5).
- Books
- 18
- By publication date
- Content intensity
- Gentle to moderate
- HootRated 1–3 out of 5 · avg 1.4
Horrible Harry Reading Order
Series numbers aren't available for most Horrible Harry books, so they're listed by publication date (oldest first).
| # | Title | Reading Level | Ages | Content |
|---|---|---|---|---|
| 1 | Horrible Harry and the ant invasion 1989 | Level 3-4 | 5-8 | Gentle |
| 2 | Horrible Harry in room 2B 1990 | Level 3-4 | 5-8 | Gentle |
| 3 | Horrible Harry and the Christmas surprise 1991 | Level 2-3 | 5-8 | Gentle |
| 4 | Horrible Harry and the dungeon 1996 | Level 3-4 | 5-8 | Gentle |
| 5 | Horrible Harry at Halloween 2000 | Level 3-4 | 5-8 | Gentle |
| 6 | Horrible Harry goes to sea! 2001 | Level 3-4 | 5-8 | Gentle |
| 7 | Horrible Harry and the dragon war 2002 | Level 3-4 | 5-8 | Mild |
| 8 | Horrible Harry and the Mud Gremlins 2003 | Level 3-4 | 5-8 | Mild |
| 9 | Horrible Harry and the locked closet 2004 | Level 3-4 | 5-8 | Gentle |
| 10 | Horrible Harry and The Goog 2005 | Level 3 | 5-8 | Gentle |
| 11 | Horrible Harry goes cuckoo 2010 | Level 3-4 | 5-8 | Gentle |
| 12 | Horrible Harry and the June box 2011 | Level 3-4 | 5-8 | Gentle |
| 13 | Horrible Harry and the secret treasure 2011 | Level 3-4 | 5-8 | Gentle |
| 14 | Horrible Harry and the scarlet scissors 2012 | Level 3-4 | 5-8 | Mild |
| 15 | Horrible Harry and the stolen cookie 2013 | Level 3-4 | 5-8 | Mild |
| 16 | Horrible Harry and the hallway bully 2014 | Level 3-4 | 5-8 | Mild |
| 17 | Horrible Harry and the birthday girl 2016 | Level 3-4 | 5-8 | Gentle |
| 18 | Horrible Harry and the battle of the bugs 2017 | Level 3-4 | 5-8 | Moderate |
Content Intensity Across the Series
VariesContent intensity ranges from Gentle to Moderate across the series.
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. Horrible Harry (18 books by Suzy Kline) lands at a grades 2–4 reading level, with average content intensity 1.4/5. Intensity varies from book to book, so check individual ratings in the list above.
The reading-order table above lists every book with per-volume reading level, age and intensity ratings 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.
All Horrible Harry Books
Horrible Harry and the ant invasion
Suzy Kline
Horrible Harry and the ant invasion
Suzy Kline
Horrible Harry in room 2B
Suzy Kline
Horrible Harry in room 2B
Suzy Kline
Horrible Harry and the Christmas surprise
Suzy Kline
Horrible Harry and the Christmas surprise
Suzy Kline
Horrible Harry and the dungeon
Suzy Kline
Horrible Harry and the dungeon
Suzy Kline
Horrible Harry at Halloween
Suzy Kline
Horrible Harry at Halloween
Suzy Kline
Horrible Harry goes to sea!
Suzy Kline
Horrible Harry goes to sea!
Suzy Kline
Horrible Harry and the dragon war
Suzy Kline
Horrible Harry and the dragon war
Suzy Kline
Horrible Harry and the Mud Gremlins
Suzy Kline
Horrible Harry and the Mud Gremlins
Suzy Kline
Horrible Harry and the locked closet
Suzy Kline
Horrible Harry and the locked closet
Suzy Kline
Horrible Harry and The Goog
Suzy Kline
Horrible Harry and The Goog
Suzy Kline
Horrible Harry goes cuckoo
Suzy Kline
Horrible Harry goes cuckoo
Suzy Kline
Horrible Harry and the June box
Suzy Kline
Horrible Harry and the June box
Suzy Kline
Horrible Harry and the secret treasure
Suzy Kline
Horrible Harry and the secret treasure
Suzy Kline
Horrible Harry and the scarlet scissors
Suzy Kline
Horrible Harry and the scarlet scissors
Suzy Kline
Horrible Harry and the stolen cookie
Suzy Kline
Horrible Harry and the stolen cookie
Suzy Kline
Horrible Harry and the hallway bully
Suzy Kline
Horrible Harry and the hallway bully
Suzy Kline
Horrible Harry and the birthday girl
Suzy Kline
Horrible Harry and the birthday girl
Suzy Kline
Horrible Harry and the battle of the bugs
Suzy Kline
Horrible Harry and the battle of the bugs
Suzy Kline
Series Like Horrible Harry: What to Read Next
Similar reading level, content intensity and themes.
- Humphrey's Tiny Tales by Betty G. Birney 8 books · Grades 3–4 · gentle content
- Boxcar Children by Gertrude Chandler Warner 151 books · Grades 2–5 · gentle to mild content
- Carolrhoda Picture Books by Laurie B. Friedman 7 books · Grades 1–5 · gentle content
- Andy Shane by Jennifer Jacobson 6 books · Grades 3–4 · gentle content
- Milo & Jazz Mysteries by Lewis B. Montgomery 9 books · Grades 3–4 · gentle to mild content
- Little Celebrations by CELEBRATION PRESS 65 books · Grades 1–5 · gentle to mild content
Questions about the Horrible Harry series
- What reading level is the Horrible Harry series?
- Horrible Harry books are at a grades 2–4 reading level (average grade level 3.4), and HootRated recommends the series for ages 5–8. There are 18 books in the series.
- What order should I read the Horrible Harry books?
- Series numbers aren't available for most Horrible Harry books, so HootRated lists them by publication date: Horrible Harry and the ant invasion (1989); Horrible Harry in room 2B (1990); Horrible Harry and the Christmas surprise (1991); Horrible Harry and the dungeon (1996); Horrible Harry at Halloween (2000); and 13 more.
- What age is the Horrible Harry series appropriate for?
- HootRated recommends Horrible Harry for ages 5–8. Content is gentle to moderate (HootRated intensity 1–3 out of 5). Intensity varies from book to book, so check individual ratings in the list above.