| Official Name: | Yaak, Montana |
| Pushpin Map: | Montana#USA |
| Pushpin Label: | Yaak |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Montana |
| Subdivision Type2: | County |
| Subdivision Name2: | Lincoln |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 72.83 |
| Area Land Km2: | 72.12 |
| Area Water Km2: | 0.71 |
| Area Total Sq Mi: | 28.12 |
| Area Land Sq Mi: | 27.85 |
| Area Water Sq Mi: | 0.28 |
| Population As Of: | 2020 |
| Population Total: | 338 |
| Population Density Km2: | 4.69 |
| Population Density Sq Mi: | 12.14 |
| Timezone: | Mountain (MST) |
| Utc Offset: | -7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | -6 |
| Elevation Ft: | 2986 |
| Coordinates: | 48.8331°N -115.7089°W |
| Area Code: | 406 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 778715 |
| Blank1 Name: | FIPS code |
| Blank1 Info: | 30-82130 |
Yaak is an unincorporated community and census-designated place in Lincoln County, Montana, United States. It is located along the Yaak River, within the Kootenai National Forest. As of the 2020 census, its population was 338.
Yaak has frequently been noted on lists of unusual place names.[2]
Yaak derives its name from the Yaak River.[3] According to local lore, A’ak is a Kootenai name meaning “Arrow.” The Kootenai River forms the shape of a drawn bow; its tributary the Yaak River is its arrow. Homesteaders arrived shortly after the passage of the Forest Homestead Act of 1906.
This climatic region is typified by large seasonal temperature differences, with warm to hot (and often humid) summers and cold (sometimes severely cold) winters. According to the Köppen Climate Classification system, Yaak has a humid continental climate, abbreviated "Dfb" on climate maps.[4]