Healthy hair usually grows between 0.25–0.5 in (0.64–1.27 cm) per month. This means that the key to having fast growing hair is to have healthy hair! Care for your hair by washing it with lukewarm water, conditioning, brushing, and trimming it regularly, and avoiding heated styling tools. Eat plenty of vitamins and minerals and drink lots of water to help your hair stay strong, and to have the best chance at growing out quickly.