Topographic feature in Montana
The Sweet Grass Hills (Blackfoot: kátoyissiksi, Cheyenne: vé'ho'ôhtsévóse, Kalispel-Pend d'Oreille: ččaɫalqn, "three peaks"[1]) are a small group of low mountains rising more than 3,000 feet (910 m) above the surrounding plains southwest of Whitlash, Montana, in Liberty and Toole County, Montana.[2][3] The tallest point in the hills is West Butte at 6,983 feet (2,128 m).[4] Quite prominent in the local area, they are clearly visible from US Highway 2 to the south, I-15, and can sometimes be seen as far North as the Crowsnest Highway (Highway 3) near Medicine Hat in Alberta as well as from the West, near Glacier National Park and Browning, Montana. Visibility may vary depending on local air temperatures or heat domes that may increase or decrease the apparent height of the features. Other named peaks in the small group are Gold Butte (6,512 ft [1,985 m]), East Butte (with two peaks, the taller of which is Mount Brown at 6,958 ft [2,121 m]), and Mount Lebanon (5,807 ft [1,770 m]).
The Sweet Grass Hills are an example of the island ranges that dot the central third portion of the state of Montana. These island ranges, completely surrounded by the 'sea' of plains and not geographically (or often geologically) part of the Rocky Mountains to the west, are "biological hotspots", containing more species than the prairie below.
Climate
Goldbutte 7 N is a weather station 5.5 miles (8.9km) northeast of West Butte (Montana).
| Climate data for Goldbutte, Montana, 1991–2020 normals, extremes 1907–present
|
| Month
|
Jan
|
Feb
|
Mar
|
Apr
|
May
|
Jun
|
Jul
|
Aug
|
Sep
|
Oct
|
Nov
|
Dec
|
Year
|
| Record high °F (°C)
|
66
(19)
|
73
(23)
|
78
(26)
|
90
(32)
|
93
(34)
|
104
(40)
|
105
(41)
|
105
(41)
|
97
(36)
|
88
(31)
|
74
(23)
|
67
(19)
|
105
(41)
|
| Mean maximum °F (°C)
|
55.0
(12.8)
|
55.6
(13.1)
|
64.1
(17.8)
|
75.3
(24.1)
|
82.3
(27.9)
|
85.7
(29.8)
|
93.6
(34.2)
|
93.6
(34.2)
|
87.8
(31.0)
|
76.8
(24.9)
|
62.5
(16.9)
|
54.7
(12.6)
|
95.8
(35.4)
|
| Mean daily maximum °F (°C)
|
33.2
(0.7)
|
34.9
(1.6)
|
43.9
(6.6)
|
55.2
(12.9)
|
64.3
(17.9)
|
70.8
(21.6)
|
80.4
(26.9)
|
80.1
(26.7)
|
69.9
(21.1)
|
55.2
(12.9)
|
42.1
(5.6)
|
33.7
(0.9)
|
55.3
(13.0)
|
| Daily mean °F (°C)
|
21.4
(−5.9)
|
23.1
(−4.9)
|
31.2
(−0.4)
|
41.1
(5.1)
|
50.1
(10.1)
|
56.9
(13.8)
|
63.9
(17.7)
|
63.0
(17.2)
|
54.4
(12.4)
|
42.1
(5.6)
|
30.4
(−0.9)
|
22.4
(−5.3)
|
41.7
(5.4)
|
| Mean daily minimum °F (°C)
|
9.5
(−12.5)
|
11.2
(−11.6)
|
18.5
(−7.5)
|
27.0
(−2.8)
|
35.8
(2.1)
|
43.1
(6.2)
|
47.4
(8.6)
|
45.8
(7.7)
|
38.9
(3.8)
|
29.1
(−1.6)
|
18.7
(−7.4)
|
11.0
(−11.7)
|
28.0
(−2.2)
|
| Mean minimum °F (°C)
|
−23.2
(−30.7)
|
−14.3
(−25.7)
|
−7.6
(−22.0)
|
9.5
(−12.5)
|
19.9
(−6.7)
|
31.7
(−0.2)
|
35.4
(1.9)
|
33.5
(0.8)
|
23.6
(−4.7)
|
7.6
(−13.6)
|
−8.0
(−22.2)
|
−19.1
(−28.4)
|
−30.5
(−34.7)
|
| Record low °F (°C)
|
−42
(−41)
|
−41
(−41)
|
−37
(−38)
|
−15
(−26)
|
8
(−13)
|
22
(−6)
|
24
(−4)
|
25
(−4)
|
9
(−13)
|
−19
(−28)
|
−32
(−36)
|
−46
(−43)
|
−46
(−43)
|
| Average precipitation inches (mm)
|
0.45
(11)
|
0.47
(12)
|
0.63
(16)
|
1.31
(33)
|
1.89
(48)
|
3.53
(90)
|
1.25
(32)
|
1.54
(39)
|
1.41
(36)
|
1.19
(30)
|
0.64
(16)
|
0.50
(13)
|
14.81
(376)
|
| Average snowfall inches (cm)
|
12.4
(31)
|
12.9
(33)
|
15.1
(38)
|
10.8
(27)
|
3.7
(9.4)
|
0.3
(0.76)
|
0.0
(0.0)
|
0.4
(1.0)
|
1.4
(3.6)
|
5.2
(13)
|
10.6
(27)
|
13.1
(33)
|
85.9
(216.76)
|
| Average precipitation days (≥ 0.01 in)
|
6.7
|
6.0
|
6.8
|
8.2
|
9.4
|
11.9
|
6.8
|
6.7
|
6.7
|
6.9
|
6.7
|
6.2
|
89.0
|
| Average snowy days (≥ 0.1 in)
|
5.7
|
5.3
|
5.6
|
3.2
|
0.8
|
0.1
|
0.0
|
0.1
|
0.4
|
2.2
|
4.4
|
5.5
|
33.3
|
| Source 1: NOAA[6]
|
| Source 2: XMACIS2[7]
|
Cultural significance
The Sweet Grass Hills are a sacred site of the Blackfoot aboriginal people who live on both sides of the 49th parallel north which forms the Canada–United States border.[8][9][10] The Hills were the site of a battle between Native people and wolfers in 1872.[11] The Sweet Grass Hills Treaty of 1887 was signed between the Blackfeet and the United States, ceding 17,500,000 acres (71,000 km2) of land to the US Government, and dividing the remaining 6,000,000 acres (24,000 km2) into three separate reservations – The Blackfeet, Fort Belknap and Fort Peck. This is often referred to as the Sweet Grass Hills Treaty/Agreement and was ratified by congress in 1888.[12] In 1993, the Hills were listed as one of America's Most Endangered Places. Mineral claims were staked here by Manhattan Minerals in 1995.[13]
West face Sweet Grass Hills from Sunburst, Montana on October 27, 2016
