zone 6b planting calendar

// --> Sign up to receive our free garden seed catalog and see whats new for your home garden. Annual minimum temperature for zone 6 is -5ºF. In both cases, it’s important to remember that these are guidelines and winter or summer can come earlier or last longer than is typical. Scroll to Map & Zone Description See the … These dates will vary a week or two so it’s important to watch the weather before planting. Detroit, Michigan is located in USDA Hardiness Zone 6.