It's the beginning of September and the departure of some of our migratory birds is sadly well underway. I haven't seen male Rose-breasted Grosbeaks since the middle of August, and the females and young grosbeaks went missing around the end of August.
Also departed are our Chipping Sparrows. I had boisterous little families of "chippies" visiting my yard until about late August as well.
The last adult male Ruby-throated Hummingbird I saw was on August 13. Migrating females and first year birds, though infrequent, are still in the yard (at least as far of September 7). We're into the range of dates now when the last one will pass through, but I will keep a hummingbird feeder up and filled with fresh nectar until early October or so. This is when a our Mini Hummingbird Feeder really becomes valuable, so I'll only be filling with 3-4 oz. of nectar at a time.
It's admittedly harder to track a "last seen" date than an arrival date, but try to jot down when you see your last of these birds for the season. It'll become a running count, where you change the date if another bird shows up. It's fun to track "last seen" dates and refer to them from year to year. I'd love to hear your "last seen" dates for any of the birds in your yard.