Ready to kick off the holiday shopping season? Costco’s Black Friday 2025 Sale is officially set to be a month-long event, giving members an extended window to score massive savings. Instead of a single hectic day, the warehouse giant will roll out deals across multiple weeks, featuring big discounts on everything from major electronics and appliances to toys, apparel, and home goods. This guide reveals the exact start dates for the online and in-warehouse portions of the sale, detailing how you can maximize your savings and be the first to grab the year’s best deals. Get ready to shop smarter, not harder, this holiday season.