Plant Growth Zones
The Maui County Planting Plan and the Department of Water Supply have compiled a system of five zones of plant growth for Maui County.

Zone Number
Zone Description
Zone 1 Wet areas on the windward side of the island. More than 40 inches of rain per year. Higher than 3,000 feet.
Zone 2 Cool, dry areas in higher elevations (above 1,000 feet). 20 to 40 inches of rain per year.
Zone 3 Low, drier areas, warm to hot. Less than 20 inches of rain per year. Sea level to 1,000 feet.
Zone 4 Lower elevations which are wetter due to proximity of mountains. 1,000 to 3,000 feet.
Zone 5 Salt spray zones in coastal areas on the windward side.