Montana Earthquakes – Current Map & Latest Seismic Data

Largest Quake Detected in Montana
M2.05 20 km NNE of Helena Valley Northeast, Montana
16 hours ago · Depth 4 km

Recent Montana Earthquakes (Past 24 Hours)

• M1.52
  30 km ESE of West Yellowstone, Montana

  Jul 17, 2026 15:56 UTC · Depth 7.8 km
• M2.05
  20 km NNE of Helena Valley Northeast, Montana

  Jul 17, 2026 05:59 UTC · Depth 4 km

Source: USGS

Montana has one of the strongest earthquake histories in the inland western United States. It is not as constantly active as California or Alaska, but the state has produced large, damaging earthquakes near Hebgen Lake, Helena, Townsend, Dillon, and the Yellowstone border region.

This page tracks the latest available Montana earthquake activity using USGS-based earthquake data. The map, recent earthquake list, statistics, and significant quake information update when the page loads or refreshes. For nearby activity, you can also compare Montana with the Yellowstone earthquakes, Idaho earthquakes, Wyoming earthquakes, and United States earthquakes pages.

Montana Earthquake Map

This map shows the latest available Montana earthquake activity using USGS M1.5+ data. It updates when the page loads or refreshes.

The interactive map shows M1.5+ earthquakes in Montana and nearby relevant zones. Each marker represents an earthquake location. Click one to see its magnitude, location, time, and depth. Use the time filter buttons to view earthquakes from the last hour, 24 hours, 7 days, or 30 days.

Montana earthquakes (map loads with JavaScript)

Why Montana Is Earthquake Country

Montana’s earthquake story is tied to its mountains, valleys, faults, and position within the northern Intermountain Seismic Belt. This broad earthquake-prone region extends through parts of Utah, Idaho, Wyoming, Montana, and nearby areas. In Montana, it helps explain why the western and southwestern parts of the state are more earthquake-active than the eastern plains.

The western half of Montana is broken by mountain ranges, basins, and older fault systems. Around places such as Helena, Butte, Dillon, Ennis, Bozeman, Missoula, Flathead Lake, and West Yellowstone, earthquakes can happen when stress builds on these faults and the ground suddenly slips.

That does not mean all of Montana has the same earthquake risk. The Yellowstone edge, Hebgen Lake area, Helena region, southwest Montana valleys, and western mountain corridors are the main areas to watch. Eastern Montana is generally quieter, although people there can still feel larger earthquakes from western Montana, Wyoming, Idaho, or farther away.

Hebgen Lake, Quake Lake, and Montana’s Defining Earthquake

If one event explains why Montana earthquake risk matters, it is the 1959 Hebgen Lake earthquake. The earthquake struck near the Montana-Yellowstone border, northwest of West Yellowstone, and triggered a huge landslide in Madison Canyon. That landslide blocked the Madison River and created Quake Lake.

The earthquake is often listed around M7.2 to M7.3, depending on the source and magnitude scale. What matters for this page is the impact: it was Montana’s strongest and deadliest recorded earthquake, with more than 28 deaths reported, serious damage around Hebgen Lake and Madison Canyon, and major changes to the landscape. Sources: USGS event page: 1959 Hebgen Lake earthquake

Hebgen Lake also shows why Montana earthquake hazards are not only about shaking. In steep mountain country, a large earthquake can trigger landslides, rockfalls, road damage, lake waves, river blockages, and long-term changes to valleys and waterways.

Helena and Montana’s Urban Earthquake Risk

Hebgen Lake was Montana’s largest earthquake disaster, but Helena is the clearest example of earthquake risk in a city. In 1935, a damaging earthquake sequence struck the Helena area. The October 18 mainshock and later strong aftershock damaged buildings, destroyed chimneys, and caused deaths from falling brickwork.

This matters because Helena’s 1935 earthquakes were not remote mountain events. They affected homes, schools, hospitals, downtown buildings, and older masonry structures. Even today, that history is important for understanding earthquake risk in Helena, Butte, Bozeman, Missoula, Great Falls, and other Montana communities with older buildings or soft valley soils.

That is the practical side of Montana earthquakes. A large earthquake in a remote area may reshape the landscape, but a smaller earthquake near a city can still cause serious local damage if buildings, utilities, bridges, or older brick structures are vulnerable.

Montana’s Main Earthquake Zones

Montana earthquake activity is not random. Most of the state’s important earthquake areas sit in the western and southwestern regions, where faults, mountains, valleys, and the Yellowstone edge come together.

• Hebgen Lake and West Yellowstone: This is Montana’s best-known earthquake area because of the 1959 Hebgen Lake earthquake and the creation of Quake Lake. Earthquakes near West Yellowstone can also overlap with the Yellowstone earthquakes page because the region sits near the Montana-Wyoming-Idaho border.
• Helena Valley: Helena has one of Montana’s most important urban earthquake histories. The 1935 earthquake sequence damaged many buildings and showed why older masonry, soft valley soils, and city infrastructure matter in earthquake planning.
• Southwest Montana, Dillon, Ennis, and Madison Valley: Southwest Montana includes several active fault and valley systems. Earthquakes here may be connected to the same wider tectonic setting that affects Yellowstone, Idaho, and western Wyoming.
• Butte, Boulder, and the western mountain corridor: The Butte and Boulder region sits within Montana’s western mountain-and-valley terrain. Earthquakes here may be smaller most of the time, but the area is important because of older buildings, mining history, highways, and infrastructure corridors.
• Bozeman, Gallatin Valley, and Livingston: The Gallatin Valley is close enough to Yellowstone, Hebgen Lake, and southwest Montana faults that larger regional earthquakes can be felt here. Bozeman also matters because of population growth and older structures in parts of the city.
• Missoula, Flathead Lake, and northwest Montana: Northwest Montana is generally less famous for earthquakes than Hebgen Lake or Helena, but it can still experience local earthquakes or feel shaking from nearby Idaho, Montana, British Columbia, or Alberta events.
• Rocky Mountain Front and Great Falls region: Central Montana is usually quieter than southwest Montana, but earthquakes can still happen. A moderate earthquake near Great Falls in January 2026 was a recent reminder that felt earthquakes are not limited to the Yellowstone and Helena areas.

How Montana Fits Into the Intermountain Seismic Belt

Montana sits near the northern end of the Intermountain Seismic Belt, which is why its earthquake pattern is closely tied to nearby Idaho, Wyoming, Utah, and Yellowstone. This is not a single fault line. It is a broad zone of faults and earthquake activity running through the inland western U.S.

In Montana, this helps explain why earthquakes cluster more often in the west and southwest. The same broad seismic belt that affects Yellowstone, eastern Idaho, and western Wyoming also reaches into Montana around Hebgen Lake, Helena, Dillon, Bozeman, and nearby valleys.

That regional connection is important for your map. A Montana earthquake near West Yellowstone may also look relevant to Yellowstone. A quake near the Idaho line may matter for both Montana and Idaho. A Wyoming or Yellowstone event may be felt in Montana even when the epicentre is technically outside the state.

Why Western and Southwestern Montana See More Earthquakes

Western and southwestern Montana experience high seismic activity because the crust there is more broken and faulted. Mountain ranges, deep valleys, old fault zones, and the Yellowstone region all sit close together. That creates more places where stress can build and release as earthquakes.

By contrast, eastern Montana is generally quieter. That does not mean it is impossible to feel shaking there, but the strongest and most frequent earthquake activity is usually farther west. This is why Montana earthquake pages should focus more heavily on Helena, Hebgen Lake, Bozeman, Dillon, Butte, Missoula, Flathead Lake, and the Yellowstone border rather than treating the whole state evenly.

The Geological Drivers in the West

• Active Crustal Extension: The crust in western Montana is actively pulling apart, creating an unstable network of fault lines.
• Topographical Stress: High mountain ranges, deep alluvial valleys, and ancient fault zones sit in close proximity, creating multiple zones where tectonic stress builds up and releases.
• Yellowstone Hotspot Proximity: The thermal energy and magmatic pressure from the nearby Yellowstone hotspot warp the surrounding crust, triggering frequent swarms of earthquakes near the state border.

The Contrast with Eastern Montana

• Stable Craton: Eastern Montana is part of the interior North American craton, a stable deep-rock region where significant tectonic faults do not actively move.
• Felt Shaking vs. Epicentres: While massive western earthquakes can send shockwaves that are felt in eastern plains, actual epicentres rarely occur there.

Montana Earthquake Hazards: Mountains, Roads, Rivers, and Older Buildings

Montana’s earthquake hazards depend heavily on location. A strong earthquake near a mountain valley can trigger landslides and road damage. A smaller earthquake near a city can still damage older buildings, chimneys, water lines, or bridges. Around lakes and rivers, shaking can also affect slopes, shorelines, and dams.

• Ground shaking: Strong shaking can damage homes, schools, hospitals, roads, bridges, older brick buildings, utility lines, and public buildings.
• Landslides and rockfalls: Montana’s mountain roads, canyon walls, steep slopes, and recreation areas can be vulnerable during stronger shaking. The Hebgen Lake earthquake showed how serious landslide hazards can be in southwest Montana.
• Surface rupture: Larger fault earthquakes can break the ground surface, damaging roads, fences, pipelines, trails, and anything built across the fault.
• Lake and river effects: Strong shaking can affect lake shores, riverbanks, dams, and reservoirs. Hebgen Lake and Quake Lake are the clearest examples of how earthquakes can change Montana waterways.
• Older masonry buildings: Helena’s 1935 earthquake sequence showed the danger of falling brickwork, chimneys, and unreinforced masonry. Older downtowns and historic buildings deserve extra attention in earthquake planning.
• Rural access problems: In rural Montana, one damaged bridge, canyon road, or mountain pass can create long detours. This matters for emergency response, ranches, visitors, and small communities.
• Aftershocks: Larger Montana earthquakes can be followed by aftershocks. These may continue for days, weeks, or longer and can still be felt near the epicentral area.

Montana Earthquake History: The State’s Biggest Seismic Events

Montana’s earthquake history includes several major events. Some happened in remote mountain country, while others affected towns and cities more directly.

• 1897 Dillon earthquake: A strong earthquake occurred near Dillon in southwest Montana. It remains one of the notable early historical earthquakes in the state and shows that southwest Montana had significant earthquake activity before modern instruments were widely used.
• 1925 Townsend / Clarkston Valley earthquake, M6.9: This large earthquake struck near Townsend and was felt across a wide region. It damaged buildings near the epicentre and remains one of Montana’s largest historical earthquakes.
• 1935 Helena earthquake sequence: The Helena earthquakes damaged many buildings and caused deaths from falling masonry. This sequence is especially important because it showed how earthquake risk affects Montana cities, not just remote mountain valleys.
• 1959 Hebgen Lake earthquake: This was Montana’s strongest and deadliest recorded earthquake. It triggered the Madison Canyon landslide, formed Quake Lake, damaged roads and structures, and remains the defining earthquake event for southwest Montana and the Yellowstone border region.
• Yellowstone-region swarms and smaller events: Southwest Montana often shares seismic activity with the Yellowstone region. Many events are small, but they help scientists track ongoing fault and crustal movement near West Yellowstone, Hebgen Lake, Island Park, and the surrounding region.

Earthquakes in Montana Today: Recent Seismic Activity

Most recent Montana earthquakes are small, but they still matter because they show which parts of the state are active. Small events near West Yellowstone, Helena, Dillon, Bozeman, Butte, or northwest Montana can help build a picture of regional stress and fault activity over time.

A recent felt example was the January 2026 M4.2 earthquake near Great Falls. It was not a major damaging earthquake, but it was widely noticed because it happened near a larger population area and reminded people that felt earthquakes can occur outside the state’s most famous seismic zones.

For this page, the map is the best way to check what is happening now. If the markers cluster near West Yellowstone, that activity may connect more closely with the Yellowstone region. If they appear near Helena, Dillon, Bozeman, Butte, or northwest Montana, they may reflect more local Montana fault activity.

Earthquake Safety in Montana

Earthquake safety in Montana depends on where you are. A visitor near Hebgen Lake, a driver in a canyon, a student in Helena, and a camper near Yellowstone may face different hazards. Still, the basic safety steps are the same: protect yourself during shaking, watch for aftershocks, and take slopes, roads, and older buildings seriously.

Montana Earthquake Safety Checklist

• Know “Drop, Cover, and Hold On” for earthquake shaking. Source: Great ShakeOut earthquake safety guidance
• Secure tall furniture, shelves, mirrors, TVs, water heaters, appliances, and heavy objects that could fall.
• Keep emergency water, food, medication, flashlights, batteries, a first-aid kit, warm clothing, and copies of important documents.
• If you are indoors, stay indoors, drop, cover, and hold on. Do not run outside while glass, signs, bricks, or power lines may be falling.
• If you are outside, move away from buildings, cliffs, canyon walls, slopes, rockfall areas, trees, bridges, power lines, and anything that could fall.
• If you are driving, pull over when safe, avoid bridges and steep slopes if possible, and stay inside the vehicle until shaking stops.
• If you are hiking, camping, fishing, skiing, or boating, watch for rockfalls, landslides, falling trees, damaged trails, shoreline changes, and aftershocks.
• In rural Montana, keep extra fuel, water, blankets, food, and emergency supplies in your vehicle because damaged roads or long detours can happen after a strong earthquake.
• After shaking stops, check for injuries, gas smells, damaged utilities, fires, unstable buildings, cracked roads, broken glass, and aftershocks.
• Follow official local emergency instructions after a noticeable earthquake, especially if there are reports of road damage, landslides, rockfalls, building damage, utility problems, or aftershocks.

How Montana Earthquakes Are Monitored

Montana earthquakes are monitored by national and regional seismic networks. These systems help locate earthquakes, estimate magnitudes, collect felt reports, and improve understanding of Montana’s active faults and earthquake hazards.

• USGS Earthquake Hazards Program: Provides national earthquake data, reviewed event pages, ShakeMaps, Did You Feel It? reports, and earthquake science resources.
• University of Utah Seismograph Stations: Helps monitor earthquakes across the Intermountain West, including the Yellowstone region and nearby Montana, Idaho, Wyoming, and Utah earthquake activity.
• Yellowstone Volcano Observatory: Monitors earthquake, volcanic, hydrothermal, and ground-deformation activity in the Yellowstone Plateau region, which overlaps with southwest Montana near West Yellowstone and Hebgen Lake.
• Great ShakeOut: Provides public earthquake safety guidance, including the Drop, Cover, and Hold On message used in earthquake preparedness education.

🗺️ Related Earthquake Maps

View broader region: United States Earthquakes

View nearby states and regions: Yellowstone | Idaho | Wyoming | Canada

View western U.S. maps: Utah | Nevada | Oregon | Washington

You can also view the latest available worldwide earthquake list.