anyone knows what tree is this?

[kamejinjess]

Location: California, Fairfield

 

[Jonny]

Pecan? What's inside the shell of the nuts?

 

[cerviarborist]

Looks like Quercus. Possibly Quercus douglasii

 

[ATH]

I agree with Quercus. Is it alive? I'm not experienced with the western oaks, but the brown leaves that remain and those acorns look like Q. wislizeni or Q. agrifolia - both of which should be evergreen...right?

 

[ThatsNotMaple]

I like cerviar's assessment. Blue Oak fits best here.