The best time (in terms of price) for any remodel is usually between Thanksgiving and the New Year because this is generally a slow time for contractors. However, if you do a lot of entertaining on either end of this period, it is not the best time. Winter or the heat of summer can be a good time for a kitchen remodel because the majority of the work will occur indoors. The main consideration is to plan the job for a time when your family can live without the kitchen while it is being remodeled.
What is the best time of year to remodel my kitchen