Why do you ask, 'Why can't women cut their hair?' Aren't women free to do whatever they want with their hair. Don't millions of women get their hair cut every day? Shouldn't your question be, 'Why would a woman committed to God choose to allow her hair to grow freely?' Now that is a reasonable question and one worthy of consideration. The biblical answer is found in 1 Corinthians 11:13-16, which says, 'Judge among yourselves. Is it proper for a woman to pray to God with her head uncovered? Does not even nature itself teach you that if a man has long hair, it is a dishonor to him? But if a woman has long hair, it is a glory to her; for her hair is given to her for a covering.'
This passage tells us that God has given a woman her “long hair” to serve as a covering for when she prays, which ought to be frequently. The term “long hair” is a translation of the Greek word comeo, which actually means “freely growing hair.” So for a woman’s hair to be long in a biblical sense, it does not have to be a particular length; it only has to be freely growing (which is to say, uncut). Since this is described as a glory to a woman, many godly women have chosen to allow their hair to grow freely as a way of glorifying God.