National Milk Day

National Milk Day, observed January 11th, commemorates the date in 1878 when milk was first delivered to consumers in glass bottles in the United States, replacing the earlier practice of ladling milk from open pails or churns directly into a customer's own container, a method that carried significant risk of contamination. The switch to sealed glass bottles marked a major public health improvement, and standardized bottled milk delivery became a fixture of American households for the next century, with milkmen making regular doorstep deliveries until the practice declined with the rise of supermarkets and home refrigeration in the mid-20th century. Milk itself has been part of the human diet for roughly 10,000 years, since the domestication of dairy animals like cows, goats, and sheep, and remains a major source of calcium, protein, and vitamin D in many diets worldwide. National Milk Day celebrates both the beverage and the history of its safe distribution, with observances including drinking a glass of milk, baking with milk-based ingredients, learning about dairy farming, or trying alternative milks as part of a broader look at how dairy has evolved.