Roy is a census-designated place (CDP) in Fergus County, Montana, United States.

[2] The community is located along U.S. Route 191 in northeastern Fergus County, 35 miles (56 km) northeast of Lewistown.

[5] Roy has a semi-arid climate (Köppen BSk) with cold winters except when moderated by chinook influences that will typically push maximum temperatures over 50 °F or 10 °C on seventeen days during winter and twelve days each in November and March.

Precipitation is fairly scarce, mostly coming from thunderstorms during late spring and summer, whilst snowfall averages 43 inches or 1.09 metres (the median is 30.9 inches or 0.78 metres) but significant falls occur on only a minority of winter days.

This Fergus County, Montana state location article is a stub.