National forests & BLM are almost always open for hunting. If for some reason it's not, it would be stated at site (high fire danger, flooding for instance).
One thing to remember.....Despite being on NF or BLM, you must be a 150 yds from any dwelling, outbuilding, or barn....There's a lot of private land with structures literally next to our (taxpayers) property.
Maps are good to get a general idea of where you want to start.....OnxMap fine tunes it.