Land in CRP (a USDA program) nationwide is all private land and permission is required to hunt it unless it happens to be enrolled in a state's walk-in hunting program. Whether a landowner elects to allow public hunting on CRP land by enrolling it in a state's walk-in hunting program is entirely up to them. I use "walk-in" to mean any state program that enrolls private land for public hunting. In Nebraska, in the past all public walk-in hunting land was in CRP because that is all NE would enroll (but not all NE CRP land was enrolled in the program; some landowners did not want the public hunting their land). Just recently NE started enrolling some crop land in the SW in its walk-in program although the great majority of it is still CRP. In Kansas, some walk-in is in CRP. KS will, however, enroll any land in the walk-in program, whether CRP, cropland, wooded, or pasture, so long as it has sufficient game on it. All states that have walk-in land publish maps before the season showing their locations. Google Earth might reveal whether walk-in plots are CRP. Summarizing, CRP land is only open to public hunting if the landowner has elected to enroll it in a state's walk-in hunting program.