Pinterest have created a wonderful Possibilities Planner for businesses, which is essentially a free calendar to help you implement your marketing strategies. "This is your go-to guide for audience insights, keyword recommendations and timing tips — download a copy to dream up a year of possibilities."
The planner is designed to "help you understand what moments matter to Pinners and how your brand can be a part of their journey as they discover, save and do." Use the calendar to see when Pinners start saving Pins for each moment, which you may discover can be surprisingly early! Download Pinterest's Possibilities Planner PDF here.