Book Awards
Jacket art © 2004 by David Elliot
Book I of The Great Tree of Avalon
- 2006 New York Times Series bestseller
- 2005 Nautilus Visionary Book Award — Grand Prize Winner ("for distinguished contribution to envisioning a better world")
- 2008 Bertelsmann Book Club Selection (Germany)
- 2005 Colorado Book Award — Nominee
- 2004 American Library Association — Best Book for Young Adults Nominee
- 2004 New York Times bestseller
Book II of The Great Tree of Avalon
- 2006 New York Times Series bestseller
- 2006 American Library Association — Best Book for Young Adults Nominee
- 2005 BookSense Pick
Book III of The Great Tree of Avalon
- 2007 Nautilus Visionary Book Award — Grand Prize Winner ("for distinguished contribution to envisioning a better world")
- 2006 New York Times Series bestseller
- 2007 Colorado Book Award — Finalist
Book I of The Lost Years of Merlin epic: The Lost Years of Merlin
- 2006 Named in "500 Great Books for Teens" by Anita Silvey
- 2003 American Library Association — Popular Paperbacks for Young Adults
- 2000 Virginia Young Readers List
- 2000 Georgia Children's Book Award — Nominee
- 2000 Massachusetts Children's Book Award — Nominee
- 1999 Texas Lone Star Book
- 1999 South Carolina Book Award — Master List
- 1998 South Carolina Young Adult Book Award — Nominee
- 1998 ABA Children's Books Mean Business List
- 1997 Colorado Book Award — Nominee
- 1997 American Library Association — Best Books for Young Adults
- 1997 The New York Public Library — Best Books for the Teen Age
- 1997 Children's Book Council — “Not Just For Children Anymore” Award
Book II of The Lost Years of Merlin epic: The Seven Songs of Merlin
- 2002 BookReview.com — Book of the Month
- 1999 International Reading Association — Young Adults' Choice List
- 1998 Curriculum Administrator Magazine — Top 100
- 1998 Children's Book Council — “Not Just For Children Anymore” Award
- 1998 ABA Children's Books Mean Business List
- 1998 Colorado Book Award — Nominee
- 1998 ALA Booklist — Top 10 Science Fiction/Fantasy Novels
- 1998 American Library Association — Best Books for Young Adults Nominee
Book III of The Lost Years of Merlin epic: The Fires of Merlin
- 2000 Colorado Children's Book Award — Nominee
- 1999 Voice of Youth Advocates — Best Books of the Year
- 1999 ALA Booklist — Top 10 Science Fiction/Fantasy Novels
- 1999 Administrator Magazine — Top 100 Curriculum
- 1999 Reading Circle of the Missouri State Teachers Association Award
- 1999 Westchester County Library System (New York) — Outstanding Books of the Year
- 1999 American Library Association — Best Books for Young Adults Nominee
Book IV of The Lost Years of Merlin epic: The Mirror of Merlin
- 2000 Colorado Book Award — Nominee
Book V of The Lost Years of Merlin epic: The Wings of Merlin
- 2002 Bank Street College of Education — Best Children's Books of the
- 2001 Nautilus Visionary Book Award — Grand Prize Winner ("for distinguished contribution to envisioning a better world")
- 2001 ALA Booklist — Top 10 Science Fiction/Fantasy Novels
- 2000 BookSense Bestseller
- 2000 Colorado Book Award — Nominee
Heartlight
- 1991 Buzzworm, The Environmental Journal — Top Choices of the Year
The Ancient One
- 2007 Wenatchee, Washington — Community Discussion Book of the Year
- 2002 Steamboat Springs, Colorado — Community Discussion Book of the Year
- 1995 Pacific Northwest Library Association — Young Reader's Choice
- 1994 International Reading Association — Young Adult Choice List
- 1994 Colorado Blue Spruce Award — Nominee
- 1994 Georgia Children's Book Award — Nominee
- 1994 PEN Center USA West Literary Award — Nominee
- 1993 American Library Association — Best Books for Young Adults
- 1993 The New York Public Library — Best Books for the Teen Age
- 1992 Parents Magazine — Best Books of 1992
- 1992 Voice of Youth Advocates — Best Books of the Year
- 1992 Colorado Book Award — Nominee
The Merlin Effect
- 2000 Best of the Texas Lone Star Reading Lists
- 1998 Utah Book Award
- 1997 Texas Lone Star Book
- 1996 Kansas State Reading Circle Award
- 1996 Colorado Blue Spruce Award — Nominee
- 1995 Colorado Book Award
Tree Girl
- 2004 Massachusetts Children's Book Award — Nominee
- 2002 Junior Library Guild Selection
- 2002 BookReview.com — Book of the Month
- 2002 Bank Street College of Education — Best Children's Books of the Year
The Hero's Trail
- 2008 Baltimore, Maryland — Calvert Hall College HS Community Discussion Book
- 2008 Burlington, Washington — High School Community Discussion Book
- 2008 Springfield, Pennsylvania — Community Discussion Book of the Year
- 2007 Utah Student Library Advisor Community Reading Selection
- 2007 Davis, Utah — Community Discussion Book of the Year
- 2005 International Reading Association — Teacher's Choice
- 2004 Nautilus Visionary Book Award — Grand Prize Winner ("for distinguished contribution to envisioning a better world")
- 2003 Book-of-the-Month Club Selection
- 2002 Colorado Book Award — Nominee
The Day the Stones Walked
- 2008 Storytelling World Award — Best Books for Young Readers
- 2008 Nautilus Visionary Book Award — Gold Medal Winner in Illustrated Children's Books category ("for distinguished contribution to envisioning a better world")
- 2008 Colorado Book Award — Finalist
- 2007 Virginia Readers' Choice Award — Nominee
High as a Hawk
- 2005 Arkansas Diamond Award — Nominee
- 2005 Nautilus Visionary Book Award — Finalist ("for distinguished contribution to envisioning a better world")
- 2005 Colorado Book Award — Nominee
- 2004 Junior Library Guild Selection
Where is Grandpa?
- 2003 Book-of-the-Month Selection for El Paso, Texas Language to
- 2001 Maryland Children's Book Award — Nominee
- 2000 Colorado Book Award — Nominee
- 2000 Texas Bluebonnet Award — Nominee
- 2000 New Jersey Educational Media Association — Best Books of the Year
- 2000 Book-of-the-Month for University of Wisconsin's Center for
To Walk In Wilderness
- 1994 Colorado Book Award — Nominee
Rocky Mountain National Park: A 100 Year Perspective
- 1996 Colorado Book Award
Audio Books
Book I of The Great Tree of Avalon
- 2005 School Library Journal — Audio Book of the Week
