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Wally

BrownCafe Innovator & King of Puns
San diego soil is full of rocks. But I don't think i have anything within the first 5inches of soil. I'm thinking of renting a aerator but for a little over 1000 sqft doesn't seem worth it.
Poke a screwdriver around the bare spots. If you hit rocks, that's the problem.
 

Wally

BrownCafe Innovator & King of Puns
The bare spots are mostly by the concrete. I'm guessing that has something to do with it.
I would bet there is stone underneath. I had the same problem near a sidewalk. I dug up rock and concrete chunks from the area and filled it with around 8 inches of rich topsoil. The concrete heats the nearby soil but now it doesn't burn up.
 
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