How long a commute is it from Somers to Greenwich, CT? Is public transport an option?

I agree with Ajanette re public transit. Since there is no direct train service, first you have to get to Metro North in a neighboring town. Then you'd have to take the train to White Plains, transfer to the local, get off at Fordham and transfer again to the New Haven line. To be honest, it's good to know of the option during the winter when the roads are bad, but on a daily basis it would be challenging.