Times to avoid Gatlinburg/ Pigeon Forge area:

Autumn
Christmas
Valentines Day
Summer
When there's a chance of snow
When they're having a car show
When it's hot
When the bears are out
When it's comfortable
When the trout are biting
When it's cold
When the rhododendrum are blooming
When there's no snow
When there is snow
When it's night time
When it's day time
When you're hungry
When you're full
Whenever you're thinking of heading up there

I hope this helps.