Save the date cards are generally sent out 6-7 months before the wedding date (up to 9 months in advance for destination weddings requiring more travel). Since you may not have the theme and design of your event picked out yet, don’t worry about being “matchy-matchy,” as you can give guests their first preview of what’s to come with the official invitation suite.
These clear save the dates from basicinvite with white font are an elegant pick, leaving plenty of room for any future design direction you may take.