What are the ideal fermentation temperatures for ales and lagers?

Ale yeasts generally enjoy fermentation temperatures between 65-75 °F. Some ale strains produce better results toward the cooler end of this spectrum and a few prefer to ferment even cooler than 65 degrees. Conversely, some ale yeast strains produce better results when fermented toward the warmer end of the spectrum. Consult the "details" tab on the product page for your yeast strain or printed material from the yeast purveyor regarding the optimum fermentation temperature for a particular ale yeast strain.

Lager yeasts generally enjoy fermentation temperatures between 45-55 °F. Some lager strains produce better results toward the cooler end of this spectrum and several prefer to ferment even cooler than 45 degrees. Likewise, some lager yeast strains produce better results when fermented toward the warmer end of the spectrum. Consult the "details" tab on the product page for your yeast strain or printed material from the yeast purveyor regarding the optimum fermentation temperature for a particular lager yeast strain.