Los Alamos County, New Mexico: Natural Disaster Risk and History
Los Alamos County, New Mexico has a Very Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 3.6 out of 100, higher than about 3% of US counties, with wildfires, landslides and earthquakes scoring highest of its 18 hazards and $5.3 million a year in expected losses.
OpenFEMA lists 8 federal disaster declarations that included Los Alamos County since 2000, not counting 2 for COVID-19; the latest is DR-4652-NM (Wildfires, Straight-Line Winds, Flooding, Mudflows, and Debris Flows, declared 4 May 2022). NOAA's Storm Prediction Center has no tornado on record touching Los Alamos County from 1950 to 2025.
Live weather alerts for New Mexico All official warnings Latest FEMA declarations
Population 19,419 Buildings worth $5.0 billion Area 110 sq mi Risk rank in New Mexico 32 of 33 FIPS 35028
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Wildfire | Relatively Low | 83.4 | $1.2 million | about once every 382 years | — |
| Landslide | Relatively Low | 66.0 | $8,309 | about once every 13 years | — |
| Earthquake | Very Low | 50.3 | $557,985 | about once every 503 years | — |
| Winter weather | Relatively Low | 49.0 | $123,632 | about 27 a year | 515 |
| Lightning | Relatively Low | 37.0 | $287,002 | about 69 a year | 30,019 strikes |
| Inland flooding | Very Low | 11.1 | $2.9 million | about once every 2.5 years | 11 |
| Hail | Very Low | 11.1 | $71,603 | about once every 1.2 years | 31 |
| Avalanche | Very Low | 8.6 | $11 | about once every 100 years | 0 |
| Cold wave | Very Low | 6.8 | $73,968 | about once every 19 years | 1 |
| Heat wave | Very Low | 6.3 | $16,616 | about once every 3.8 years | 5 |
| Tornado | Very Low | 3.8 | $23,531 | about once every 155 years | 0 |
| Strong wind | Very Low | 3.0 | $29,100 | about once every 5.2 years | 8 |
| Ice storm | Very Low | 1.9 | $1,494 | about once every 67 years | 0 |
| Drought | No Rating | 0.0 | — | about 94 a year | 2,597 |
| Volcanic activity | No Rating | 0.0 | — | — | 1 |
| Coastal flooding | Not Applicable | — | — | — | — |
| Hurricane | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
Score: FEMA's percentile among US counties that face the hazard (higher = more risk). Expected loss: FEMA's modelled average yearly loss to buildings, people (as a statistical value) and crops. How often: FEMA's annualised frequency of the hazard in the county; for some hazards it counts event-days, so it is a rough guide, not a forecast. "Not Applicable" means FEMA does not model that hazard here.
Federal disaster declarations 8
Most common: Fire 4, Flood 3, Hurricane 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 2000s | 3 | Fire ×2, Hurricane |
| 2010s | 4 | Flood ×3, Fire |
| 2020s | 1 | Fire |
The last 8
Widest declarations that included Los Alamos County
- Hurricane Katrina Evacuation (2005, EM-3229-NM): 33 New Mexico counties designated.
- Severe Fire Threats (2000, EM-3154-NM): 33 New Mexico counties designated.
- Severe Storms, Flooding, and Mudslides (2013, DR-4152-NM): 23 New Mexico counties designated.
Named storms in its declarations: Hurricane Katrina (2005).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. New Mexico also had 14 statewide declarations with no county list.
Tornado record since 1950 0
No tornado in NOAA's Storm Prediction Center record touched Los Alamos County between 1950 and 2025. That does not mean one cannot happen.
How Los Alamos County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Los Alamos County (this page) | — | Very Low | 3.6 | Wildfire |
| Santa Fe County | 50 km | Relatively Moderate | 86.0 | Wildfire |
| Sandoval County | 54 km | Relatively Low | 77.0 | Landslide |
| Rio Arriba County | 79 km | Relatively Low | 80.5 | Wildfire |
| Bernalillo County | 97 km | Relatively High | 94.4 | Winter weather |
| Taos County | 100 km | Relatively Low | 74.3 | Wildfire |
Nearest by distance between county centres. Every county in New Mexico, ranked.
Vulnerability and resilience
| Social vulnerability | Very Low 10.6 |
|---|---|
| Community resilience | Very High 99.7 |
| Community risk factor | 0.52 |
| Expected annual loss, all hazards | $5.3 million |
FEMA scales expected losses up where social vulnerability is high (people who may find it harder to prepare, evacuate or recover) and down where community resilience is high. A factor above 1 raises the risk score. For social vulnerability a high rating is worse; for resilience a high rating is better.
Prepare for Los Alamos County's main hazards
- Right now: National Weather Service alerts for New Mexico · all official warnings on Global Incident Tracker.
- Wildfire: US wildfires now · Wildfire smoke: what protects you
- Landslide: Landslides recorded
- Earthquake: Earthquakes today · Earthquake safety guide
- Your property's flood zone: FEMA Flood Map Service Center ↗ — this page cannot tell you that.
- Official preparedness guidance: Ready.gov ↗ and your county emergency management office.
What this page shows, and what it misses
FEMA's National Risk Index rates a whole county against every other US county; it is a planning-level estimate for nationwide comparison, not a flood-zone map and not a substitute for a local risk assessment or the risk to one home. Declarations are presidential disaster, emergency and fire management declarations that named this county; state declarations and SBA or USDA designations are not included. Tornadoes are counted when the county is one of up to four listed on the track; 670 tornadoes that crossed a state line carry no county list in NOAA's file and are left out.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Los Alamos County
What natural disasters is Los Alamos County, New Mexico most at risk from?
Los Alamos County, New Mexico has a Very Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 3.6 out of 100, higher than about 3% of US counties, with wildfires, landslides and earthquakes scoring highest of its 18 hazards and $5.3 million a year in expected losses.
How many federal disaster declarations has Los Alamos County had?
OpenFEMA lists 8 federal disaster declarations that included Los Alamos County since 2000, not counting 2 for COVID-19; the latest is DR-4652-NM (Wildfires, Straight-Line Winds, Flooding, Mudflows, and Debris Flows, declared 4 May 2022). Another 14 New Mexico declarations were made statewide without a county list.
How many tornadoes have hit Los Alamos County?
NOAA's Storm Prediction Center has no tornado on record touching Los Alamos County from 1950 to 2025.
Is the National Risk Index a flood zone map?
No. The National Risk Index is a planning-level estimate for a whole county, built for nationwide comparison. It does not tell you the flood zone or the risk of a single property: for that, look up the address on FEMA's Flood Map Service Center (msc.fema.gov) and ask your local floodplain manager.