You can update your coffee bar seasonally by offering themed beverages, snacks, and décor to match the time of year. In the fall, provide pumpkin spice lattes, chai tea, and spiced cookies, with warm-toned décor like pumpkins and leaves. For winter, introduce peppermint mocha, hot chocolate with toppings, and gingerbread, complemented by snowflake or holiday-themed decorations. Spring could feature floral teas, matcha lattes, light pastries, and fresh flowers, while summer brings cold brew, iced teas, fruit-infused snacks, and tropical-themed décor. Rotating syrups, creamers, cups, and signage for each season keeps the coffee bar fresh and engaging year-round.