This thread is a duplicate thead, as you will find all necessary information here:

Changing rollover dates for CL Hi guys could anyone tell me when is the best part of the month to change the contract date for CL. example CL05-CL06. Because obviously the data is quite different between rollovers. thanks

Changing rollover dates for CL revtrader: "Last Date" is the last working day prior to volume crossover. I used the settlement prices to calculate the offsets, but if you calculate them from the close, they will be similar. 88379

Today is "official" rollover. However, volume pre-open still favors July, but that could change in the first few minutes. I am watching volume in July and August on a 1 minute chart today, and will follow the leader.

Closing this thread, please use the thread in post 11.

Mike