FAT is the base of the 144th Squadron, on active duty performing air intercept along the Pacific Coast. For base security since 9/11 a major street (McKinley) along the southern side of the airport has been closed. That caused the closure of the main spotting spot at FAT.
I have noticed some spotting going on near the north end of the FAT runways at the intersection of Dakota and Chestnut. People park south of Dakota on the west side of Chestnut. But I do not know if the police ask people to move along or not.
By the way, you will find a large Portuguese community in the area surrounding Fresno, consisting of recent immigrants up to the 3rd or 4th generation born in the US. Mainly Azorean but also some mainland. Because of that there are a number of Portuguese celebrations in the area throughout the year.
"Travel is fatal to prejudice, bigotry, and narrow-mindedness." - Mark Twain