I trapped a total of 23 squirrels last year, and quit trapping by late July. I wasn't seeing any squirrels. Don't know why.
I started trapping again mid-May, but because my next door neighbor wants every squirrel I trap and takes them to his rural, wooded property, I generally only set the trap out the day before he goes. That greatly limits what I catch. He only goes once a week. I only have caught 5 so far, and have one sitting in the trap right now, scheduled for its relocation trip in the morning. I caught a nice, big coon last night (I have a large trap that apparently will only catch large, heavy animals). I just turned the coon loose. I buy roasted peanuts in the shell and mix the peanut halves in with peanut butter. Every animal seems to like that recipe.