I know a few.. But one does have to be up for a road trip... All nice ranges though.. At least they were when I was last there.

Hot Sulpher Springs- About 8 miles west of the town, on 40. Range out to 200 yrds. *was* maintained by DOW. Closed in winter..

Springfield Rifle range- If this one was closer, I'd be at it every weekend
15 miles south of Springfield.. Range to at least 1000 yrds, use to be an "antelope" at 800 yrds. Covered bench.

Las Animas Rifle range- About mid way between Las Animas and Adobe Resevoir. Bare bones, out to about 110 yrds.

Mike Higbee SWA. between Lamar and Granada on U.S. 50. Concrete benches out to 100 yrds.

Not saying any of them are "close". But, if You find yourself needing "to get away from it all" for awhile..