I see from the previous post that you have St Augustine. That is always important to mention when you ask a turf question. Also important is where you live. St Augustine thrives from Miami to Sacramento, so your soil and climate are important. So where do you live? And if you live in a metro area, like LA or San Diego, please mention the specific community.

Your picture shows how close this yellow spot is to a concrete driveway or sidewalk. There are three possibilities that come to my mind.

1. Your sprinklers are not tuned up enough to water right to the edge of the grass.

2. Concrete collects heat during the day and releases it at night resulting in a lot more soil moisture evaporation adjacent to the paving. In other words, it needs to be watered more deeply and possibly more frequently right in that area along the concrete.

3. Chinch bugs love the heat from concrete. If you have a chinch bug infestation, that is exactly where it is going to start. You can test for chinch bugs by holding a piece of plain paper in one hand and wiping your other hand across the grass, palm down, so the grass blades flick back up as your hand passes over. The flicking motion will flick the chinch bugs, if any, onto the paper.

I live in West Fort Worth, Texas in Tarrant County.  That area there I do 10 to 15 minutes 3 times a week. I will check the sprinkler in that area and make sure it's a short throw vs over throwing.

I live in West Fort Worth, Texas in Tarrant County.  That area there I do 10 to 15 minutes 3 times a week. I will check the sprinkler in that area and make sure it's a short throw vs over throwing.

Thanks for the location.

Generally deep and infrequent is the mantra for watering. Deep means 1 inch all at one time. Infrequent means once per week with temps in the 90s to 100. If you have had temps higher than 100 and you are not water restricted, then deep water once every 5 days should work better for you all around. Unless you have a very high volume sprinkler system, you are not getting an inch in 10 to 15 minutes. When you get rain, then reset your calendar and pick up watering when the grass looks like it needs it.