Coneflowers bloom in mid-to late summer, typically from July into October in most of the United States. Coneflowers have been bred from North American native plants, and can be planted in nearly all of the U.S., with the exception of the far-northern Midwest and the deep South. Gardeners in very cold climates may see a shorter blooming season, while Southern gardeners may see their coneflowers begin to bloom in early June and extend late into fall. Most coneflower species are hardy in zones 3 through 9, making them an ideal plant for naturalizing no matter where you're gardening.