Of course, it depends who you’re speaking to.
I doubt that every host, everywhere, would agree with that at all. I have two apartments that are full all year round, despite the fact that we’re in an area that traditionally has a tourist season and a slower season. It depends how much effort you’re prepared to go to in order to get those bookings.
Regarding the time question, it depends on your area. (I’m afraid I don’t know Atlanta well at all). Here, I’d be very worried if I wasn’t mostly booked up for the summer months (June, July, August, September) already but I get bookings a long time in advance mostly, so to me March seems to be \too late to be thinking about summer pricing.
I don’t price according to season particularly but to events. My prices go up considerably during certain local events because of the demand. I also don’t pay attention to what other hosts are charging - the only price I ever look at is the nightly price of the nearest hotel (almost always higher than our price.)
By the way, here a 2/2 at $750 per night, if it was well located, and had good amenities, would be a reasonable price here. There’s no way that you can compare listings unless you’ve stayed there.
Remember though that sometimes hosts put prices right up at times that they don’t want to host. Their thinking is “I don’t want to have guests here over Christmas but if they’re prepared to pay $750 per night, I’ll put up with it”. So looking at other prices in the area is unlikely to work.