My rosemary plant is brown.
If My Rosemary Plant Is Brown Will It Come Back?
Certified GKH Gardening Expert
This depends. Most are not hardy to heavy frost. Start cutting the tips down until you see green or living tissue. If there is still green tissue, then it will likely come back. If not, then you can still see if it will come back. If it has not within a month or so, then it is dead.
This article will help you on the care of rosemary: https://www.gardeningknowhow.com/edible/herbs/rosemary/growing-rosemary-plants-rosemary-plant-care.htm