We recommend our premium Northern Red Oak Acorns squirrel food this late in the season. Acorns have a 3-4 month shelf life after the September harvest. Most acorns start to mold and turn black inside by December. If you are ordering acorns for your squirrels - please order our premium squirrel food. The difference between premium squirrel acorns and regular Northern Red Oak Acorns is that we cut test batches of acorns and only put in whole nuts with white/tan nut meats into your order. While we can't guaranteed that every acorn will be whole in your order of premium squirrel acorns without cracking each acorn - most of the acorns will have whole nut meats that are not moldy or black.