Do your preseason scouting. When you find a good area get in before first light just like deer season. have a comfortable spot picked out and sit down. Make sure you have camo gloves on and camo covering face. Even wearing an orange vest and hat the camo covering face and hands work. The human face stands out like glow in the dark paint to any animal.
Wait until multiple squirells are in range pick one out and kill it. The rest will start to chatter but will be still visable. Pick out another and kill it. Then you'll have silence and squirells wil be hid. Careful glassing will reveal one more of the bushytails but you won't see much more than the eye and ear so take your time and look carefully. When you find it take you 3rd and go pick up all three.
Walk 150 -200 yards out of the area sit and wait again. Might take 45 minutes - an hour but if yo did your scouting squirells in that are will come out ,repeat process.
I've found this works in any area with good squirell populations with the exception on very windy or a steady rain.