I recently discovered this wonderful vast grasslands in northeast Colorado. It is full of wildlife and so peaceful. You can drive on many of the dirt roads. There is even a birding route to help you find the many species that call the grasslands home. Most of the roads are well maintained dirt, so be prepared to travel on them. You’ll need to go slow to spot the wildlife anyways. 
There is also a campground – Crow Valley if you head north on CO77. It is small and when I was there during the week very unpopulated with people. Currently, some of the spots are flooded, but many are still usable and available. The wildlife there will be amazing because it sits on the creek. Be ready for birds galore! You’ll probably also see pronghorn and if you’re lucky, a swift fox or badger who also call the grasslands home. 
To get there go east on CO 14 from i25 in Fort Collins through Ault. You’ll hit the first section about 18-20 miles out. The grasslands are located north of CO 14. There is a second area where the Pawnee Buttes are located if you keep going east through Briggsdale, CO. Good luck and have fun!
