For starters, how fast your hair can grow depends primarily on genetics, and the average rate of growth is roughly 1/2 inch per month. While there are ways to maximize growth to its optimal levels, there is no solution that grows your mane longer overnight. In fact, men should beware of any product or “expert” claiming to grow inches of hair in a month. Here are some of the best ways to grow your hair out naturally, including good nutrition, regular exercise, proper sleep, quality hare care, and more.