I don't think it's a robin's egg, as their eggs are remarkably blue. I have no idea, it's very hard to identify eggs without seeing the parents. It took me hours and hours to identify a hermit thrush's eggs.
I'd recommend searching for birds that have white eggs (with brown speckles) in your area. That's how I narrowed it down, then compared each species one by one. :)
Lat: 35.85, Long: -83.52
Spotted on Jul 7, 2012
Submitted on Jul 9, 2012