Determining average vacancy rates in a certain area

[Nicole Robbins]

Hi fellow vacation rental investors (I'm new, but soon I'll also fall into this category). 

I'm analyzing the numbers on a mountain lake property in Virginia and am getting stuck on one of the most important estimates to get right - the average vacancy rates. 

Does anyone know of a website or tool that can help answer this question? One that can provide average vacation rental vacancy rates for a specific destination?