Kirkland is a proprietary brand of Costco, a membership-only wholesaler and retailer with stores in most areas of the United States. This Kirkland Signature coffee was roasted by Starbucks. It is not a medium roast, by the way, but a dark roast. Visit www.costco.com for more information. Yes, when it comes to the two-and-a-half-pound bags of coffee varieties like Kirkland\'s Signature House Blend Medium Roast, Espresso Blend Dark Roast, and Decaf House Blend Medium Roast, they come labeled with a \"Custom roasted by Starbucks\" stamp. Green Mountain Coffee Roasters Inc. (GMCR), a Waterbury, Vt. -based supplier of specialty coffee and coffee makers, said it partnered with Costco Wholesale, Issaquah, Wash., to be the exclusive manufacturer of Costco Kirkland Signature brand K-Cup packs for the Keurig single-cup brewing system.