There are a fairly large number of them in CA for more than one reason. Limited public land with the right environment for some species like pheasant is a big one. The regular cycle of drought conditions in the southwest is another.
But there are good ones and some not so good ones. Some really bad ones too.
I've hunted about 4 of them from Socal up to about the middle of the state. By far the best flying birds were at Ace-Hi in central CA near Helm. The terrain isn't much, but the birds are more consistantly good flying and will get up more like wild birds than the other 3 places I've been to. The owner tries to minimize the human exposure to the birds and they are raised in large flight pens. It seems to work to keep the birds wary enough to flush when humans or dogs get close.
A place we hunted at in Tehachapi a few years ago was terrible. You could walk up to all the birds and almost pick them up. My dog caught a good number of them without much effort.
I hunted a CA DFG "Family Hunt" near Blythe a couple times. Ol man Robinson at Robinson farms would host it on his alphalfa farm, maybe still does. The birds came from Ace-Hi the couple years I went, if I recall correctly. Here's a pic from one of those hunts back 5-6 yrs ago. The first one was fun since it took us a couple hours to get our birds, then the next one only took less than half an hour for 3 of us and was the last time I went down to that one.

In the end, when my friends, who aren't really dedicated hunters, want to have a good time, they want to go to Ace-Hi. I'm happy to run my dogs for them and sometime actually shoot too. It's a good time and my dogs will get on as many birds in one day as they might see in half the season otherwise. I can run my two dogs for half a dozen friends which adds up to a lot of birds at 10-12 birds per hunter. They're not the same as wild, but pretty close most of the time.
I highly recommend Ace-Hi if you just have to hunt a pen raised bird or need a workout for your dog. We drive from south of L.A. to central CA and back in one day to do this, because we know the birds are good.












