The active months in the primary CMX Silver futures are:
All other are considered 'off' months and are primarily used by hedgers and commercial traders. And even a lot of hedgers and commercials shy away from using the off months and stick with the primaries because of the liquidity issue. They often use the primaries with secondary interest rate hedges just to save a couple of bucks because of the size they need to work with.
Matthew C. Shelley
As always: Trading in futures and options is very high risk investing. You can lose all or more of the money you invest. Only risk capital should be used.