ISO provider in Vail, CO first week of March 2020

So, sorry to be Dr. Downer, but Vail (and all of the Colorado mountain towns) is tough.  

Your best local bet would be to look at some of the "Sugar" sites, but even then, you're going to struggle unless you're lucky.  

If you have deep pockets, it's not unreasonable or impossible to have Denver talent make the trek up (it's about 100 miles each way), but you'll pay for the privilege, only a handful will do it, and you're fucked (not in a good way) if the weather goes to shit.

There are, apparently, some agencies up there, but I can't speak to their quality or even confirm they exist.