- Tracking pythons, the quest to catch an invasive predator and save an ecosystem, Kate Messner
- Long road to freedom, Kate Messner ; illustrated by Kelley McMorris
- Christopher Columbus and the Taino people, Kate Messner and José Barreiro ; illustrated by Falynn Koch
- Tracking tortoises, the mission to save a Galápagos giant, Kate Messner
- The scariest kitten in the world, by Terrifying Kitten (with help from Kate Messner) ; illustrated by MacKenzie Haley
- Breakout, by Kate Messner
- The American Revolution, Kate Messner ; illustrated by Justin Greenwood
- Chirp, by Kate Messner
- Rescue on the Oregon trail, Kate Messner ; illustrated by Kelley McMorris
- Manhunt, Kate Messner
- Fergus and Zeke at the science fair, Kate Messner ; illustrated by Heather Ross
- The next president, the unexpected beginnings and unwritten future of America's presidents, Kate Messner ; [illustrations] Adam Rex
- Tree of wonder, the many marvelous lives of a rainforest tree, by Kate Messner ; illustrated by Simona Mulazzani
- Fergus and Zeke and the 100th day of school, Kate Messner ; illustrated by Heather Ross
- Marty McGuire, by Kate Messner ; illustrated by Brian Floca
- Over and under the canyon, by Kate Messner ; with art by Christopher Silas Neal
- Messner, Kate, Ranger in time, 12
- Fergus and Zeke, Kate Messner ; illustrated by Heather Ross
- Fergus and Zeke and the field day challenge, Kate Messner ; illustrated by Heather Ross
- Messner, Kate, Fergus and Zeke, 1
- Race to the South Pole, Kate Messner ; illustrated by Kelley McMorris
- Rolling Thunder, by Kate Messner ; illustrated by Greg Ruth
- The Titanic, Kate Messner ; illustrated by Matt Aytch Taylor
- The Mayflower, Kate Messner ; illustrated by Dylan Meconis
- Dr. Fauci, how a boy from Brooklyn became America's doctor, Kate Messner ; illustrated by Alexandra Bye
- Capture the flag, Kate Messner
- Eye of the storm, Kate Messner
- Messner, Kate, Over and under
- The exact location of home, Kate Messner
- Journey through ash and smoke, Kate Messner ; illustrated by Kelley McMorris
- Up in the garden and down in the dirt, by Kate Messner ; with art by Christopher Silas Neal
- Messner, Kate, Ranger in time
- Night of soldiers and spies, Kate Messner ; illustrated by Kelley McMorris
- Women's right to vote, Kate Messner ; illustrated by Dylan Meconis
- Disaster on the Titanic, Kate Messner ; illustrated by Kelley McMorris
- Over and under the snow, by Kate Messner ; with art by Christopher Silas Neal
- Over and under the rainforest, by Kate Messner ; with art by Christopher Silas Neal
- Pearl Harbor, Kate Messner ; illustrated by Dylan Meconis ; with special thanks to Maggie Tokuda-Hall, who served as an early reader and consultant for this book
- Hurricane Katrina rescue, Kate Messner ; illustrated by Kelley McMorris
- Sea monster's first day, by Kate Messner ; illustrated by Andy Rash
- Fergus and Zeke for president, Kate Messner ; illustrated by Heather Ross
- Messner, Kate, History smashers
- Insect superpowers, 18 real bugs that smash, zap, hypnotize, sting, and devour!, by Kate Messner ; illustrated by Jillian Nickell
- Plagues and pandemics, Kate Messner ; illustrated by Falynn Koch ; with a special thanks to Ella Messner, who served as a researcher and contributor for this book
- The brilliant deep, rebuilding the world's coral reefs : the story of Ken Nedimyer and the Coral Restoration Foundation, Kate Messner ; [illustrated by] Matthew Forsythe
- Messner, Kate, Fergus and Zeke
- The Underground Railroad, Kate Messner and Gwendolyn Hooks ; illustrated by Damon Smyth
- Messner, Kate, Ranger in time, 10
- Escape from the great earthquake, Kate Messner ; illustrated by Kelley McMorris
- Hide and seek, Kate Messner