Around here in my area of upper Pa. and upstate N.Y. They hunt a lot in the spring time. When a farmer plows a field, wait until the first gentle rain, then walk the field early in the morning with your back to to the sun. The arrowheads and such will usually stand out more than just the plain stones. I know people who have found hundreds of them this way. One person also found a gold coin.
Good luck hunting,