Colorado has become known as the "Napa Valley of Beer" due to the large number of craft breweries that have opened there since the 1980s. Early Colorado breweries like Coors helped popularize beer across America in the mid-20th century. The craft brewing movement started with homebrewers experimenting in their basements and grew significantly in the late 1980s and 1990s as breweries like Boulder Beer and New Belgium opened. Colorado cities like Denver and Boulder now have many local breweries and beer has become deeply ingrained in the state's culture.