35 to 40 feet
50 feet for slow pitch softball, 46 feet for fast pitch.
For boys under 15 the pitcher's mound is 46 feet from home plate. For girls, it's forty feet for fast pitch and fifty feet for slow pitch.
That depends on the age group college and high school use a 43' distance in fast pitch.
The length from homeplate to the pitcher's mound in 10U fast-pitch is 35-40 feet. It depends on your league.