Costco's Beloved Coffee Brand Missed The Mark With This One - Chowhound

pimpampix/Shutterstock We may receive a commission on purchases made from links. Buying in bulk at Costco saves you some cash and the time you'd have spent shopping later. But when it comes to coffee, like the ground Kirkland Signature Colombian Supremo, those massive cans are a liability. Once you open them, you're on a clock. Ground coffee typically retains its peak flavor for about a week or two after opening.…