Every resource and guide and post and book it seems has a different “recommended time” to mail out invitations.  I was told the 3 month mark…then the 2 month…then the 6 week mark.  We compromised and did something like the 7 week mark.  I would recommend doing it before then.  That sounds like plenty of time…but if you have any changed addresses, by the time they get returned and you mail new ones out, you’re at the 3 week mark.  Which is what has happened to us.  (Hopefully we’re done getting invitations returned…but we did just get one a couple days ago, so you never know.)  Just to ensure that they all arrive in plenty of time, I would recommend mailing invitations at least at the 2 month mark.  🙂

-Bonnie