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How To Dry Fresh Herbs Using a Dehydrator. 1  Preheat your dehydrator with the thermostat set between 95 and 115 degrees Fahrenheit. 2  If your herbs are damp, be sure to gently blot them dry with a towel to remove as much moisture as you can. 3  Place the herbs on the dehydrator trays in a single layer.
Some of the best herbs to dry are those that have strong flavor such as sage, thyme, oregano and rosemary. Sage, oregano and thyme can all be grown from seed and will survive winters as far north as zone 5. Well drained soil is essential though as root rot is common in both these, and other woody herbs.