Usda Planting Zone Map 2025. Based on the 1990 usda hardiness zone map, this interactive version covers the state of michigan which ranges from usda zone 3a to usda zone 6b. Plant zone map courtesy of usda

The plant hardiness zone map was updated for the 2025 gardening season with the addition of thousands more local weather stations. More simply put, the zones represent the lowest temperature each year, on average, for a geographic area.