Sweet Grass, Montana

Sweet Grass is a census-designated place and unincorporated community in Toole County, Montana, United States, on the Canada–US border. It is the northern terminus of Interstate 15, an important route connecting western Canada, the western United States, and Mexico. The population was 65 according to the 2020 census.^[3]

Sweetgrass, Montana
Census-Designated Place
Topographical map of the Sweet Grass area
Coordinates: 48°59′34″N 111°58′01″W
Country	United States
State	Montana
County	Toole
Area [1]
• Total	0.48 sq mi (1.25 km2)
• Land	0.48 sq mi (1.25 km2)
• Water	0.00 sq mi (0.00 km2)
Elevation [2]	3,547 ft (1,081 m)
Population  (2020)
• Total	65
• Density	134.58/sq mi (51.94/km2)
FIPS code	30-73075
GNIS feature ID	2583856[2]

In 2004, a joint border facility opened at the Sweetgrass port of entry and Coutts, Alberta, housing both Canadian and American federal authorities.^[4]

Fire service is provided through the volunteer fire department in Coutts.^[5]

It is 34mi to Shelby,108mi to Havre and 174 to Missoula.

Climate

Sweet Grass has a semi-arid climate (Köppen BSk) that closely borders a humid continental climate (Köppen Dwb).

Climate data for Sweet Grass, Montana
Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Record high °F (°C)	64 (18)	70 (21)	72 (22)	84 (29)	91 (33)	96 (36)	105 (41)	105 (41)	95 (35)	88 (31)	74 (23)	67 (19)	105 (41)
Mean daily maximum °F (°C)	31 (−1)	35 (2)	43 (6)	54 (12)	65 (18)	73 (23)	82 (28)	81 (27)	70 (21)	57 (14)	40 (4)	31 (−1)	55 (13)
Mean daily minimum °F (°C)	8 (−13)	12 (−11)	20 (−7)	30 (−1)	39 (4)	47 (8)	52 (11)	50 (10)	42 (6)	31 (−1)	19 (−7)	10 (−12)	30 (−1)
Record low °F (°C)	−39 (−39)	−35 (−37)	−29 (−34)	−7 (−22)	16 (−9)	30 (−1)	35 (2)	30 (−1)	12 (−11)	−12 (−24)	−26 (−32)	−44 (−42)	−44 (−42)
Average precipitation inches (mm)	0.30 (7.6)	0.23 (5.8)	0.58 (15)	1.00 (25)	2.61 (66)	3.13 (80)	1.96 (50)	1.94 (49)	1.45 (37)	0.62 (16)	0.45 (11)	0.30 (7.6)	14.57 (370)
Average snowfall inches (cm)	9.5 (24)	8.3 (21)	8.9 (23)	6.6 (17)	2.3 (5.8)	0.4 (1.0)	0.1 (0.25)	0.1 (0.25)	2.6 (6.6)	4.2 (11)	7.4 (19)	9.1 (23)	59.5 (151.9)
Source: [6]

Demographics

Historical population

Census	Pop.	Note	%±
2020	65		—
U.S. Decennial Census[7]