How high does the first hill on a roller coaster have to be?

The height of the first hill on a roller coaster is not a fixed value and can vary depending on the design and specifications of the coaster. Various factors, such as the desired thrill level, speed, and track layout, influence the height of the first hill. Additionally, different types of roller coasters, including wooden, steel, and inverted coasters, may have different height requirements for their first hills.