We gave up serious trapping of squirrels about 3 months ago because there is so much natural food about, there are tons of beech mast, acorns, hazel nuts and berries everywhere, probably start again in January.
Also you must take into acount what they have already stashed.When the food source has gone they are pretty easy to cage trap, i put all my traps on platforms up in the trees ,stops predators wrecking the cages trying to get the squirrels out, whole maize and peanuts are a good bait,
hope this helps.
Brian