The commodity day, and the date your position stops being optional

A commodity future trades almost around the clock, on CME's Globex from Sunday evening to Friday afternoon US time, with grains keeping their own shorter sessions shaped by a century of farming rhythm. But the day is not uniform, and the calendar is not decorative. Both carry structure a trader has to know.

Settlement is a procedure, not the last trade

Each day the exchange publishes an official settlement price per contract, computed from trading in a defined closing window rather than read off the final print. That number - not the last trade - marks every open position to market, moves margin between accounts overnight, and feeds the world's benchmarks and fund valuations. Liquidity clusters into the settlement window for exactly that reason: it is the few minutes when the day's number is being decided. The quiet hours between sessions, meanwhile, are where a market-moving headline meets an empty book - the gap risk you already know from FX and indices, sharpened by commodity volatility.

The dates with teeth

An index future dies gently: cash settles, money moves, done. A physically delivered commodity contract ends in barrels, bushels or bars, and the calendar around that ending is the part of commodities with real consequences.

• Last trading day: the final session for the expiring contract. After it, the position is a delivery matter.
• First notice day: from here, sellers can nominate buyers to receive delivery. Anyone long who cannot accept a thousand barrels is gone before this date - not on it.
• The roll: positions meaning to stay exposed move to the next month in the days before these deadlines, in a migration you can watch in the volume figures.

Professionals treat these dates as hard rails, and brokers enforce them for retail accounts by force-closing positions held too close to delivery. April 2020's minus $37.63 was this calendar doing its work: expiry arrived, storage was full, and the holders still in the expiring contract discovered what the promise was worth when nobody could take the barrels. The date turned a paper position into a physical problem.

The habit to build

Before trading any commodity contract, know three dates: when it stops trading, when notice begins, and when the volume actually migrates. Your wrapper may hide the mechanics; module 3 covers what its roll costs you. The calendar underneath is the same either way - and it does not negotiate.