Check out this great video on coffee freshness from California-based coffee expert Chris Baca. He breaks down several key factors that affect freshness, and how to harness them:
1. The importance of degassing coffee in the first week after it is roasted to assure peak flavor and consistency. (If you use it right out of the roaster, good luck dialing it in for a good espresso.)
2. The importance of proper storage to mitigate oxidation, which makes coffee stale and starts as soon as it comes out of the roaster.
And more insight that will keep you in fresh coffee (but not too fresh)!