Hi Kristie!
Most people divide daylilies in the spring or in early fall when it's cool. Wait until after they finish blooming. If it's cool enough for you in August, and it likely will be in Colorado, divide then and replant. Daylilies need at least six weeks before a hard frost to settle in and grow new roots. Although the Stellas need to be divided at least every two years for maximum bloom, the larger daylilies don't need to be divided as often. I have some with 18 or 20 fans that are still blooming fine, so I leave them alone. I'll post some links later with directions for how to divide.

By the way, how close are you to where the wild fires destroyed so many homes in Colorado Springs?

Debra

Here's an article with photos showing how to divide daylilies. I find pictures to be helpful in explaining.

Here is a link that might be useful: This Old House