Squirrel hunting in the Sierras

[kon]

My wife and I recently moved to Tahoe and I drove out to a few different spots along highway 88/89 to find squirrels. I heard some Douglas squirrel calling, but after a few hours I didn't see or hear a single gray squirrel. Is there a trick to locating them in the pine forests around 7k elevation?

 

[ZMT588]

I used to hunt them around the Sly Park area. Mormon Emigrant Trail, Between 88 and 50. Always had decent luck out there. Kind of just have to hike and listen.