We started end of October and finished following October. We live in Vancouver where it rains a lot and year we built it also snowed a lot for here. If people didn’t build through rain and bad weather here there would be no houses. I actually think building through awful weather showed us site conditions that weren’t as obvious in blissful summer and helped us shift our water management plans.

I’m still in early stages, but my builder addressed this when we first met. He said best time for us to start building considering both work flow from his other projects and site conditions due to weather was going to be March (I live in NC). I’d discuss this with your builder.

@Sarah - sadly in todays market everyone's decisions are not based solely on what is "best".... it is influenced more by when is the contractor available to pour foundation and when is the material available and when is better time in builders schedule... we were hoping to start early fall as well but..... :(

I see N/E Georgia can get as low as 3˚ F. in the winter. And a whopping 3mm of snow in Atlanta!

I've started in December in Toronto and regularly had to shovel a foot of snow off the exposed floors till the roof was on. (And we're in the sunbelt of Ontario!)

Spring has always been the worst start time here as so many builders want to avoid cold weather expenses--tenting the house and heating with propane for the brick/stone masons, heated concrete pours covered in straw and plastic blankets.

Different considerations in your climate. Ask your builder!