| # | County | Drought Severity Index |
|---|---|---|
| 1 | Twin Falls County | 455.7 |
| 2 | Owyhee County | 430.8 |
| 3 | Cassia County | 417.1 |
| 4 | Gooding County | 400.0 |
| 5 | Jerome County | 400.0 |
| 6 | Lincoln County | 400.0 |
| 7 | Minidoka County | 400.0 |
| 8 | Power County | 400.0 |
| 9 | Oneida County | 391.6 |
| 10 | Bannock County | 356.1 |
| 11 | Bingham County | 348.2 |
| 12 | Kootenai County | 318.7 |
| 13 | Benewah County | 300.0 |
| 14 | Latah County | 300.0 |
| 15 | Nez Perce County | 300.0 |
| 16 | Caribou County | 299.9 |
| 17 | Jefferson County | 294.7 |
| 18 | Franklin County | 287.2 |
| 19 | Lewis County | 274.3 |
| 20 | Bear Lake County | 273.0 |
| 21 | Madison County | 272.3 |
| 22 | Camas County | 269.1 |
| 23 | Elmore County | 266.8 |
| 24 | Bonneville County | 264.7 |
| 25 | Bonner County | 260.8 |
Source: U.S. Drought Monitor (13 October 2026). All counties with data are ranked. Estimates carry margins of error.
Citing this page: GIS Map, “Counties in the Worst Drought in Idaho”, https://gismap.land/rankings/idaho/worst-drought-counties. Figures from U.S. Drought Monitor (13 October 2026).
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