Landslides risk in Colorado

The first time you notice a crack in your foundation that wasn't there last spring, you might think it's just settling. In Colorado's foothills and mountain towns, that crack can be the start of something bigger. Landslides here don't always look like a wall of mud. Sometimes they're slow, creeping movements that rack doors, snap pipes, and tilt floors over months. Other times they move fast after a heavy rain or a snowmelt surge.

Who this hits hardest

If your house sits on a steep slope, at the bottom of a canyon, or below a burn scar, you're in the crosshairs. In Colorado, that means parts of Clear Creek, Gilpin, Boulder, Jefferson, El Paso, and Fremont counties along the Front Range foothills. It also means mountain towns in Summit, Eagle, and Garfield counties — think the I-70 corridor near Glenwood Canyon. Down in the San Juan Mountains, San Juan, Ouray, San Miguel, and La Plata counties have their own long history of slides and debris flows.

You don't need a famous slide to be at risk. A small slope failure behind a subdivision can push a house off its foundation. The state's overall landslide rating is a 3 out of 5, but that number hides a lot. Your specific risk depends on the dirt under your house, how much water it's holding, and what's uphill.

Renters get hit too — especially in older mountain towns where affordable housing sits on marginal ground. But homeowners carry the financial punch.

After the event — claims and repairs

Here's the hard part: your standard homeowners policy almost certainly excludes earth movement. Landslides, mudslides, and sinkholes are typically not covered. Flood insurance through NFIP can cover mudflow — a river of mud — but not a true landslide where the ground itself shifts. That distinction matters. If a wall of mud comes down a creek, you might have a flood claim. If your hillside just lets go, you probably don't.

Some carriers offer a difference in conditions (DIC) policy or a landslide endorsement, but they're rare in Colorado. So the first thing after a slide is to call your insurance agent and ask exactly what your policy says about 'earth movement.' Get it in writing. If you're denied, contact the Colorado Division of Homeland Security and Emergency Management (DHSEM) to see if your county has been included in a federal disaster declaration. That can open up FEMA assistance, but it's not a substitute for insurance.

Repairs are slow and expensive. You'll need a geotechnical engineer to figure out why the slope failed. Fixing it might mean drainage improvements, retaining walls, or even moving the house. Don't hire the first contractor who knocks on your door. In Colorado, after a big slide, out-of-state crews show up fast. Check licenses with the state.

Before the season starts

Landslides in Colorado often happen during spring snowmelt and the summer monsoon. So the best time to act is late winter and early spring. Walk your property. Look for new cracks in the foundation, tilted retaining walls, doors that stick, or water pooling where it didn't before. If you're on a slope, clear your gutters and extend downspouts well away from the house. Water is the enemy.

If I had one weekend and a slope behind my house, I'd spend it clearing drainage and taking dated photos of every crack. Those photos become your baseline. If something moves later, you'll know it.

Also, sign up for your county's emergency alerts. Many Colorado counties use CodeRED or similar systems. Know your evacuation route. If you live below a burn scar, pay attention to rain forecasts — even a short, intense storm can trigger a debris flow.

Questions we get

Does my Colorado homeowners insurance cover a landslide?

Usually no. Standard policies exclude earth movement, which includes landslides, mudslides, and sinkholes. Flood insurance may cover mudflow, but that's a specific type of flood event, not a landslide. You'd need a separate endorsement or DIC policy, and those are hard to find in Colorado.

How do I know if my house is in a landslide-prone area?

Start with the USGS Landslide Hazards Program and your county's planning department. Many Colorado counties have landslide susceptibility maps. Look at the slope above and below your house. If you see terraced ground, leaning trees, or springs seeping out of a hillside, that's a clue. A geotechnical engineer can give you a real answer for a fee — worth it before you buy.

What should I do if I see a new crack or bulge in my yard?

Don't ignore it. Take photos with a ruler for scale, note the date, and call a geotechnical engineer. Also tell your neighbors — if the slope is moving, it affects more than just your lot. In the meantime, keep water away from the area and don't add weight uphill.

Official sources

• Colorado Division of Homeland Security and Emergency Management
• USGS Landslide Hazards Program
• Ready.gov – Landslides and Debris Flow