Be sure to purchase your daylilies from a reputable garden center that can assure you the variety you are considering will survive the winter. Bachman's carefully selects daylilies that are not only hardy here in the Twin City area, but are hardy all the way through USDA Hardiness Zone 3. That covers almost all of northern Minnesota. In addition to all the different species of daylilies, there are literally thousands of varieties from which to choose. You can make your choice based on plant size, color, flower shape, and season of bloom.
Some varieties are also fragrant.
Watch for the award winners. Tags or signs should provide you with lots of information. In our area, that is June. Late blooming, from late August into the fall. Most dwarfs only grow about 12 inches tall, forming a neat, compact mound.