Peet’s explains their coffee better than I can:
At Peet’s we take freshness seriously. It is only by roasting and shipping the same day that we can be sure that you enjoy the distinctive deep-roasted flavor of Peet’s. We call it “Roaster-to-Cup” freshness, and you can taste the difference. When you choose Home Delivery, we ship right to your home – it is the freshest of the fresh. It’s the apple right off the tree, the bread right out of the oven…you get the picture.