These are some things to take into consideration when making reservations in Kyoto:
There are 3 major holiday seasons:
During these holiday seasons, ryokan accommodation prices increase and rooms have been booked well in advance.
Another busy season is School Trip Season, which occurs in Spring and Autumn in popular tourist destinations such as Kyoto and Nara. Thousands and thousands of school children arrive from all over Japan to go sightseeing and learn first-hand about their cultural heritage. During this period many of the ryokans are fully booked, and it is often very difficult to find accommodation.
Here is a list of national public holidays in Japan: