It's suitable for middle school grades, around grades 5-8. The themes and language are accessible for kids at that level.
The graphic novel 'A Wrinkle in Time' is often recommended for grades 6-7. It presents challenging concepts in a visually engaging way that students at this stage can handle and enjoy, fostering a love for literature and adventure.
I think it works well for upper elementary and lower middle school grades. The story has enough depth to engage older kids but isn't too complex for younger ones in that range. It can spark their imagination and critical thinking.