From Futures Wiki

According to Chicago Board of Trade history, the earliest "forward" contract for corn was recorded in 1851. This essential grain has come a long way since then in both everyday applications and futures trading. Since the first Amerindians cultivated it, corn has been an essential food product for humans and livestock alike. Modern technology has seen corn elevated to an industrial and fuel product, changing the supply and demand dynamic and causing more than one debate as prices soared to record highs.

Contract Size: 5,000 Bushels

Price Quote & Tick Size: Cents per bushel; minimum fluctuation is ? cent per bushel ($12.50 per contract)

Contract Months: March, May, July, September, December.

Trading Specs: CME Globex: 6:00 pm - 7:15 am and 9:30 am - 1:15 pm central time, Sunday - Friday Central Time CBOT Open Outcry: 9:30 am - 1:15 pm Monday - Friday Central Time

Daily Price Limit: $0.30 per bushel expandable to $0.45 and then to $0.70 when the market closes at limit bid or limit offer. There shall be no price limits on the current month contract on or after the second business day preceding the first day of the delivery month.