The nearest expiration date for NY Ethanol (Platts) Futures (May 2015) is Jun 2, 2015.
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 (May 2015) before Jun 2, 2015.