I'll talk about putting your garden to bed for the winter. You should have all of your new daylilies planted by now. The time in the Pacific Northwest to do this is usually before October 1st at the latest. We will still have a few warm days so that they can set down their roots and get settled in for the winter. I usually place some alpha pellets and mix it with the soil in the hole to give them an added boost. If I'm planting a bare root plant they have been in some type of liquid fertilizer. I usually use Miracle Grow Quick Start. Most bare root plants that I get in the mail will be cut back so that the energy goes into the root and not trying to keep the top green. Now is the best time to get all your labels ready to go and place with the new daylily at planting. If the plant has been in a container, loosen the roots before planting. If the plant wilts after planting then cut back.
This is a great time to cut back your daylilies. I like to do this now so that I can clean out all of the dead stuff from the summer, look at the labels and fix them if necessary. It is much easier to do this now. The daylilies will grow back very fast. This also enables you to clean out the weeds easily. You can also determine if you want to divide a large clump and share it with a friend of donate it to a club sale. Daylilies sometimes go dormant so you may not see them until spring, one other good reason to have labels at planting. Read my advise on labeling your plants. You won't be sorry if you use overkill on this. Many daylilies look similar and are hard to identify. Club sales usually require that you know the name of the cultivar before donating.
I usually cut back again in February or so, also just to clean up wilted, slimy growth and weeds. Garden chores are much nicer to do when the sun is shinning.