Free camping options on Maui are limited, as most campgrounds require a fee or permit. However, there is one option for free camping on the island: Polipoli Spring State Recreation Area. This campground is located at a high elevation in the Kula Forest Reserve and offers a unique experience. Keep in mind that the campground is at an elevation of 6,200 feet, and weather can be unpredictable. Also, facilities are limited, so come prepared for a more primitive camping experience.
For more camping options on Maui, you can explore Hipcamp.