Montana law sets the county's overnight backstop: a vehicle may not be left on a public highway right-of-way longer than 48 hours, or on county, city, or state property longer than 5 days. Beyond that it can be treated as abandoned.
Yellowstone County does not run a nightly overnight-parking-ban program on rural roads. Instead the state's abandoned-vehicle statute sets the outer limit. Under MCA 61-8-356, "a vehicle may not be parked or left standing upon the right-of-way of a public highway for a period longer than 48 hours" or on a city street or state, county, or city property longer than 5 days. Leaving a vehicle past those limits creates a presumption that the last-registered owner is responsible for the abandonment and liable for removal and storage costs. For overnight parking on private property, only the Community Decay Ordinance (visible junk/inoperable vehicles) and any applicable zoning district apply—there is no rural overnight ban on your own driveway.
After the 48-hour/5-day limits, the vehicle may be removed as abandoned; the last-registered owner is presumed responsible and liable for towing and storage.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Yellowstone County, MT
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