Opening weekend mid November about in the 40's i think, it was three years ago. The landscape like I said was steep or should I say STEEP. Typical forest for southern Illinois, oak trees mostly and a lot of ferns, pretty clear shooting lanes though.
It really is a beautiful park, should you ever get the chance to go there in the spring there's waterfalls and unbelievable overlooks. Be careful though especially with little ones, no guardrails. They have primitive and powered camp sites and a lake with some nice bass and they stock it with rainbows too. Really great place to go hiking.