The answer to 'why is my grass turning brown' is that there are several common causes, including drought, disease, pests, or improper lawn care. Brown spots or patches in your grass can be a sign of stress or damage that needs to be addressed.
Some of the most common causes of brown grass include lack of water, insect infestations, disease, too much or too little fertilizer, and compacted soil. Identifying the specific issue is key to finding the right solution. If the problem is isolated to a small area, it may be something you can fix yourself. But widespread or recurring brown spots often require the expertise of a professional landscaper.