Princess House changes its clearance sales according to the seasons. For example, as of November 2015, its clearance is made to last from October 10 to November 6. To check for any specials going on at Princess House, use the Special Offers link found at the bottom of the PrincessHouse.com home page.
Most stores have specials throughout the year. However, the specials are decided by a store's marketing teams, so it is hard to gauge when products will be available for sale. The same concept works with in-store coupons, which are available through mailing lists. To keep up to date with Princess House and its specials, sign up for its monthly newsletter.