My ID is set to expire while on vacation. Does it need to be valid in order to return home? Leaving to Colorado from California for 3 weeks.

Yes. They won't let you past security with an expired ID.

You could drive back. :)

Yes definitely

Yes, you definitely need your ID renewed

You need to get it renewed before you leave. It will most likely cause a problem..

Yes, you would need a valid form of identification upon entering back

Yes