The contract description page is available through TWS and will provide the last trading date. You can find contract details for US future contracts on the CME Group and ICE/NYBOT websites and the IBKR's Futures Physical Delivery webpage will provide the close out dates.
Where can I find the Last Trade Date for my future contract?
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Where can I find futures contract specifications in TWS?
How can I find and understand margin requirements for futures contracts?
What is the ticker for Micro E-mini S&P 500 futures and options on futures?
What is the ticker for E-mini Russell 2000 futures and options on Futures?