Mini Nasdaq - Switch to March

Amateur Question:

When should I stop trading the December contract and switch to the March contract?
(Daytrading only)

I see it expires on Friday the 21st, but I'm new to futures and not sure if I should switch over before that time. Thanks.
 
Most will switch to March at tomorrows RTH open. If I didn't already know and had no way to find out I'd either compare volumes or bring up a DOM on both and see which had the deepest market.
 
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