Let's Preserve Drying Herbs Penn State Extension
Mar 24, 2019 Oven Drying and Sun Drying. Oven drying is generally not recommended because even the lowest temperature destroys much of the flavor, oils, and color of the herbs. To oven dry, set the oven at the lowest temperature (not above 180 F) for 3 to 4 hours with the oven door open. The oven light in some ovens may provide enough heat to dry herbs.