Brokers usually follow rules and will close out your position days or hours before first notice (long position) or last trading (short position). Last trading day is too late for CL to roll. As it is a commodity with physical supply and demand (unlike financials or gold), the old contract is heavily influenced by the cash market. Positions have to be delivered to the middle of nowhere (Cushing, Oklahoma), and delivery constraints can increase volatility of the old contract. Need to roll at least 3 days prior to last trading.
As a rule of thumb you would roll around the 18th/19th, during the last years it always fell within the period from 15th to 21st of a month. So nex roll date for CL 08-10 will be around June, 18.
I've said before, the third Thursday is usually very near the exact time when volume overtakes from one contract to another, and you switch.
For me, it doesn't have to be an exact science. I don't switch contracts in the middle of the day the moment volume takes over. If I am a day off, the world is not going to end. So, I use the third Thursday rule more or less and just make it consistent.
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Last trading day for the July contract is Tuesday, June 22. So probably volume will shift on Thursday, June 17. Agree with Mike, this is no science. For commodity futures there are no specific rollover dates. Volume cross-over depends on the cash market.