You can't really put a height on that because Sorrel is a colour of horse (a bright red chestnut) and not a breed.
Sorrel is a certain shade of chestnut. It has nothing to do with how tall the horse will be. Sorrel color is an accepted color for many breeds, from mini's and ponies to the largest draft horses.
A sorrel horse is a horse with red based colouring.
General Thomas Jonathan "Stonewall" Jackson's horse was named Little Sorrel.
Sorrel Golding is 5' 5 1/2".
sorrel
Assuming this refers to King William III of England, who died from injuries sustained from falling from a horse, the horse was named Sorrel.
King William's horse was called "Sorrel".
sorrel is redish/brown and grullo is gray with black leg and wither stripes
General Stonewall Jacksons favourite horse
chestnut
Little Sorrel.
The American Quarter Horse comes in 5 colors: Black, Sorrel, Chesnut, Bay, and rarely White. But the most common color is Sorrel.