I have an in-ground herb garden with mint, sage, tyme, oregano, and rosemary. The sage, oregano and rosemary still have leaves; do I cut them back or leave them be for the winter? If it's the former, how far do I cut them back? Thank you.
You'd do better to leave them for now. Some of the growth may burn back in the winter, and it's usually better to underprune than overprune if it results in too much loss by spring. Portions with winter burn can be pruned off in the spring.
You may want to mulch around the rosemary, which is the most tender of your selection. However, do not mulch ON the stem because that may encourage rot.