I contract this decision out to my irrigation controller. I told it my grass type, the type of soil, and the slope of each irrigation zone. It contacts the weather service, checks for prediction of rain, the temperature, it determines the evaporation rates. It connects with a larger computer in the cloud. It decides if it will water and it tells me what it decided, or I can shut the notice off. Life is too short to trust folklore on irrigation times. Invariably my grass looks best on the block.
Edit to add: it adjusts for seasonal changes.
Rachio on Amazon.
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