Private Land
The most common location to find arrowheads is on private property that once housed one or more tribal groups. As long as you have permission to be on the property, anything you find can be collected with the owner's permission. Look along riverbeds and near any stone circles. Riverbeds were a common hunting ground due to the constant passing of animals through the area. Stone circles often represent a meeting area where the various warriors would gather to create their tools and practice their arts of archery, skinning, tanning and other important purposes. It is almost always forbidden to take arrowheads or any tools from burial mounts or other religious-centered areas. Even when you have permission to collect in these regions, confer with the owner before you enter.
Collecting for Donation
It is possible to get permits in many states or even federal permissions to collect for various museums or universities. Speak with the archaeological department of these organizations about collecting for the sake of donation. Such permits will allow you access to many areas that private collectors would be fined or imprisoned for entering. Bear in mind that when gathering artifacts for another group you are their representative and your actions will reflect on your sponsor. Be civil and quickly obey any authority figures who take care of these precious resources and historical lands. You do not want cost an organization access.
Off-Limits Areas
Public parks and national monuments that are protected by federal government entities are off-limits to private arrowhead collectors. While fossil and gem collection is available in most state parks, arrowheads are often considered historical artifacts and must be turned over to officials before exiting the location. When in doubt, contact your local state officials, as federal and state laws may be different. The Bureau of Land Management or local forestry services can answer questions as to which areas are restricted and for what purposes.