What is the setting of The Red Pony by John Steinbeck?

The setting of this novel is at the ranch and in agricultural valleys of California during the early part of the twentieth century. It is a time of transition, when old ways are quickly vanishing. This is reflected in the characters Gitano, whose Spanish heritage has been wiped out by the white settlers, and Grandfather, whose mission in life has been exhausted because there is no more frontier to be discovered.