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1) Is your greencard a (a) 2 year conditional card, or, (b) a 10 year residence card?
2) When did you leave the US last - the month and year, please?
This is not an answer, but an information request. I need this information to answer your question. Please reply, so I can answer your question. Thank you in advance.
First of all, be aware that someone on a greencard cannot stay out of USA for too long - see HERE.
Having said that, still, if seeking to enter the United States after temporary travel abroad, you will need to present a valid, unexpired greencard. So you want to come back BEFORE the card expires. And you may face trouble until/unless you have a valid greencard (and not just a pending renewal).
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