In NY state if land is not posted you can hunt the land. But in all my years of hunting (over 50 years) I was trainned to go and ask first. Over the years I never have had a problem till this year.
I am living in a new location and found that the land across from were I built has a old trailer on it but was told the owner has not been up for over 5 years, and lived in another state. I did the research and got his address from the tax map and sent him a letter asking for his ok to bow hunt the land and also if I shot a deer on my land and it went into his land could I trail it to recover the deer.
Well after waiting over a month, I had a guy who said the owner had called him and would not give permission, nor even being on his land to recover a deer etc.
What gets me, is last year I saw several hunters all in camo in the gun season driving his land, now I just bet they did not have his ok. some times you try to do the right thing and get a kick in the head.