Craft a Brew - Beer Brewing Kits & Supplies on Instagram: "What’s the difference between an ale and a lager? It all comes down to the yeast. Lager yeast prefers cold fermentation temperatures. It is considered “bottom fermenting” yeast because it tends to remain at the bottom of your fermenter. Ale yeast prefers warmer fermentation temperatures & is considered “top fermenting” yeast. Lagers include Czech pilsners, Helles lagers, rice lagers, Oktoberfests, Marzens and the like. While ales include