The United States is split up into zones by the USDA. These zones range from 1a - 13b and use temperature and geographical location to measure the hardiness and quality of soil across the country. Here in Minnesota, we are in zone 4/5 (zone 13 is the hottest and zone 1 is the coldest). When it comes to growing dahlias across these agricultural zones, the growing process is the same. However, living in a colder zone means that we will have to re-plant our dahlias each year. In warmer zones, like 8-11 dahlias can be classified as perennials and will re-grow each year. Click to learn more about gardening zones here: u003ca href=u0022https://heartysol.net/knowing-your-hardiness-zone-in-the-midwest/u0022u003eKnowing your Hardiness Zone in the Midwestu003c/au003e