We have stayed at the West Yellowstone KOA and rode our quads out to some of the trails in the area and had a good time and took a van tour through the Yellowstone, it was worth the cost.
We have also stayed at Redrock on Henry Lake and road our quads and RZR from the park on roads and on some off-road trails.
We also rode around most of the lake and went in our RZR to an exhibition rodeo at a youth horse camp up the road, the food was good too.
Redrock would get a return trip not sure of the Yellowstone KOA as we found out later the ride to the ATV trails was not quite legal.
That said, my wifes great uncle owns the Flagstaff KOA.
The West Yellowstone KOA I believe is the first one, has the shortest season and makes the most money. Location location location.
Em addict no 12 step program needed!!
2016 Fleetwood Excursion 35B
2015 Jeep Rubicon Hard Rock--Toad