Off-highway vehicles (OHVs) are required by law to display a valid OHV decal to operate on public and state trust lands in Arizona. This includes “street legal” vehicles that meet these two requirements.
Map apps may direct you to Parashant if you search for directions to "Grand Canyon" due the canyon's name in both the national park and monument names. The national park has paved roads and services. Parashant has no services and rugged/remote conditions.
Grand Canyon-Parashant National Monument
The monument is open every day of the year, however many areas may be inaccessible when roads are impassable. Within the boundaries of Grand Canyon-Parashant there are no facilities or visitor contact stations. Do not rely on your cellphone - there is no cell service on the monument. Roads can be impassable during the monsoon season, July through September, and after winter storms.