The nearest expiration date for NY Ethanol (Platts) Futures (Jun 2013) is Jun 28, 2013.
The best time to sell a futures contract is when you've already made money on the investment, but still have plenty of time left before the expiration date. Thus, a good option would be to sell NY Ethanol (Platts) Futures (Jun 2013) before Jun 28, 2013.