Westerns
A Circle Unbroken by Sollace Hotze
Battle Cry by Jan Neubert Schultz
Black Storm Comin’ by Diane Lee Wilson
Boston Jane by Jennifer Holm
Bull Rider by Suzanne Morgan Williams
By the Great Horn Spoon! by Sid Fleischman
Caddie Woodlawn by Carol Ryrie Brink
Charlotte's Rose by A.E. Cannon
Cowboy Ghost by Robert Newton Peck
Crosswire by Dotti Enderle
Crows and Cards by Jospeh Helgerson
Daisy Kutter by Kazu Kibuishi (graphic novel)
Eight Seconds by Jean Ferris
Ghost Medicine by Andrew Smith
Gib and the Gray Ghost by Zilpha Keatley Snyder
Gib Rides Home by Zilpha Keatley Snyder
Hattie Big Sky by Kirby Larson
He Will Go Fearless by Laurie Lawlor
Heart of a Shepherd by Rosanne Parry
Horsethief by Robert Newton Peck
How to Get Rich in the California Gold Rush: An Adventurer's Guide to the Fabulous Riches Discovered in 1848 by Tod Olson
Jim Ugly by Sid Fleischman
Letters from the corrugated castle: a novel of gold rush California by Joan Blos
Lone by Stuart Moore (graphic novel)
Love Comes Softly by Janette Oke
Mr. Tucket by Gary Paulsen
My darlin' Clementine by Kristiana Gregory
New Found Land: Lewis and Clark's voyage of discovery by Allan Wolf
Old Yeller by Fred Gipson
Our Only May Amelia by Jennifer Holm
Peace Like a River by Leif Enger
Rapunzel's Revenge and Calamity Jack by Shannon Hale
Rodzina by Karen Cushman
Runs with Horses by Brain Burks
Sacajawea: the story of Bird Woman and the Lewis and Clark Expedition by Joseph Bruchac
Sarah Plain and Tall series by Patricia MacLachlan
Save the Queen of Sheba by Louise Moeri
Sing Down the Moon by Scott O'Dell
Small White Scar by K.A. Nuzum
Soldier Boy by Brian Burks
Streams to the river, river to the sea: a novel of Sacagawea by Scott O'Dell
Sunshine Rider: The First Vegetarian Western by Ric Lynden Hardman
Texas Standoff: A Novel of the Texas Rangers by Elmer Kelton
The Ballad of Lucy Whipple by Karen Cushman
The Borning Room by Paul Flesichman
The Captain's Dog: My journey with the Lewis and Clark Tribe by Roland Smith
The Crimson Cap by Ellen Howard
The Devil's Paintbox by Victoria McKernan
The Maude March books by Audrey Couloumbis

The Great Railroad Race: the Diary of Libby West, Utah Territory 1868 (Dear America Series) by Kristiana Gregory
The Indian in the Cupboard by Lynne Reid Banks
The Legend of Bass Reeves by Gary Paulsen
The Righteous Revenge of Artemis Bonner by Walter Dean Myers
The Virginian by Owen Wister
The Misadventures of Maude March by Audrey Couloumbis
The Drummer Boy of Vicksburg by G. Clifton Wisler

The Water Seeker by Kimberly Willis Holt
The Winter People by Joseph Bruchac
Lassie Come-Home by Eric Knight
Riding Freedom by Pam Munoz Ryan
The Great Turkey Walk by Kathleen Karr
Smoky the Cow Horse by Will James

True Grit by Charles Portis
A Tale of the Western Plains by G. A. Henty
Scrib by David Ives
Maude March on the Run! by Audrey Couloumbis
Riders of the Purple Sage by Zane Grey
Old Yeller
by Fred Gipson
Tucket's Ride
by Gary Paulsen
Tucket's Gold
by Gary Paulsen
Mr. Tucket by Gary Paulsen
Call Me Mr. Francis Tucket by Gary Paulsen
Calamity Jack by Shannon Hale (graphic novel)
How to Get Rich on the Oregon Trail: My Adventures Among Cow, Crooks & Heroes on the Road to Fame & Fortune by Tod Olson

West to a Land of Plenty: The Diary of Teresa Angelino Viscardi, New York to Idaho Territory, 1883 (Dear America) by Jim Murphy
Wolves, Boys and Other Things That Might Kill Me by Kristen Chandler
Worth by A. LaFaye
Written in Blood by John Wilson

Here are some booklists online that may be helpful to you as well:
Weber County Library: Teens Historical Fiction
http://www.weberpl.lib.ut.us/content/booklists/sort/t/72

Popular Paperbacks for Young Adults 2001 Western
http://www.ala.org/ala/mgrps/divs/yalsa/booklistsawards/popularpaperback/2001popularpaperbacks.cfm#western

The Western Writers of America give out an annual award called The Spurs. They have a category for best juvenile fiction and nonfiction. You may want to take a look at some of the winners:
http://www.westernwriters.org/spur_award_history.htm#2010