This is an incomplete list of earthquakes in the U.S state of Montana. Only earthquakes with a magnitude of 6.0 or greater are listed. Aftershocks are not included, unless they were of great significance or contributed to a death toll.
| Date | Location | Mag. | MMI | Deaths | Injuries | Damage / notes | Ref | |
|---|---|---|---|---|---|---|---|---|
| 1959-08-18 | Hebgen Lake | 7.2 Mw | IX | 28+ | $11 million | |||
| 1935-10-31 | Helena | 6.0 Mw | VIII | 2 | Aftershock. | |||
| 1935-10-18 | Helena | 6.2 Ms | VIII | 2 | [1] | |||
| 1925-06-27 | Townsend | 6.9 Mw | IX | 2 | $150,000 | [2] | ||
| 1897-11-04 | Dillon | 6.4 Mw | [3] | |||||
| Note: The inclusion criteria for adding events are based on WikiProject Earthquakes' notability guideline that was developed for stand-alone articles. The principles described also apply to lists. In summary, only damaging, injurious, or deadly events and those of scientific interest should be recorded. | ||||||||
The 1959 Hebgen Lake earthquake occurred in the western United States on August 17 at 11:37 pm (MST) in southwestern Montana.
The 2020 Central Idaho earthquake occurred in the western United States on March 31, 2020, at 5:52 PM MDT, near Ruffneck Peak in the Sawtooth Mountains of central Idaho, 72 miles (116 km) northeast of Boise and 19 miles (31 km) northwest of Stanley. It had a magnitude of 6.5 and was felt with a maximum intensity of VIII.