Summit County, Colorado: Natural Disaster Risk and History
Summit County, Colorado has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 60.2 out of 100, higher than about 60% of US counties, with avalanches, landslides and lightning scoring highest of its 18 hazards and $30 million a year in expected losses.
OpenFEMA lists 4 federal disaster declarations that included Summit County since 1977, not counting 2 for COVID-19; the latest is EM-3224-CO (Hurricane Katrina Evacuation, declared 5 September 2005). NOAA's Storm Prediction Center has no tornado on record touching Summit County from 1950 to 2025.
Live weather alerts for Colorado All official warnings Latest FEMA declarations
Population 31,040 Buildings worth $12 billion Area 626 sq mi Risk rank in Colorado 16 of 64 FIPS 08117
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Avalanche | Very High | 99.0 | $11 million | about 1.1 a year | 32 |
| Landslide | Relatively Moderate | 93.6 | $137,175 | about once every 2.1 years | — |
| Lightning | Relatively Moderate | 80.8 | $1.0 million | about 6 a year | 67,734 strikes |
| Hail | Relatively Moderate | 78.5 | $1.1 million | about 2.3 a year | 88 |
| Winter weather | Relatively Moderate | 74.2 | $220,931 | about 37 a year | 697 |
| Inland flooding | Relatively Low | 65.4 | $15 million | about once every 28 years | 1 |
| Wildfire | Very Low | 53.6 | $80,388 | rarer than once in 1,000 years | — |
| Earthquake | Very Low | 46.9 | $325,653 | rarer than once in 1,000 years | — |
| Volcanic activity | Very Low | 38.8 | $7 | rarer than once in 1,000 years | 1 |
| Tornado | Very Low | 21.8 | $382,366 | about once every 13 years | 0 |
| Ice storm | Very Low | 19.5 | $21,971 | about once every 67 years | 0 |
| Strong wind | Relatively Low | 19.0 | $232,452 | about once every 2.4 years | 17 |
| Cold wave | Very Low | 5.7 | $33,949 | about once every 3.0 years | 6.4 |
| Drought | No Rating | 0.0 | — | about 38 a year | 1,232 |
| Heat wave | No Rating | 0.0 | — | — | 0 |
| 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 4
Most common: Coastal Storm 1, Snowstorm 1, Fire 1, Drought 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1970s | 1 | Drought |
| 2000s | 3 | Coastal Storm, Snowstorm, Fire |
The last 4
Widest declarations that included Summit County
- Hurricane Katrina Evacuation (2005, EM-3224-CO): 64 Colorado counties designated.
- Wildfires (2002, DR-1421-CO): 58 Colorado counties designated.
- Drought (1977, EM-3025-CO): 42 Colorado 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. Colorado also had 12 statewide declarations with no county list.
Tornado record since 1950 0
No tornado in NOAA's Storm Prediction Center record touched Summit County between 1950 and 2025. That does not mean one cannot happen.
How Summit County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Summit County (this page) | — | Relatively Low | 60.2 | Avalanche |
| Clear Creek County | 41 km | Relatively Low | 46.7 | Avalanche |
| Eagle County | 50 km | Relatively Low | 76.2 | Avalanche |
| Lake County | 52 km | Very Low | 5.7 | Landslide |
| Grand County | 52 km | Relatively Low | 50.2 | Avalanche |
| Gilpin County | 57 km | Very Low | 6.4 | Wildfire |
Nearest by distance between county centres. Every county in Colorado, ranked.
Vulnerability and resilience
| Social vulnerability | Very Low 10.6 |
|---|---|
| Community resilience | Relatively Moderate 44.3 |
| Community risk factor | 0.75 |
| Expected annual loss, all hazards | $30 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 Summit County's main hazards
- Right now: National Weather Service alerts for Colorado · all official warnings on Global Incident Tracker.
- Avalanche: Official warnings now
- Landslide: Landslides recorded
- Lightning: Weather alerts for Colorado
- 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 Summit County
What natural disasters is Summit County, Colorado most at risk from?
Summit County, Colorado has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 60.2 out of 100, higher than about 60% of US counties, with avalanches, landslides and lightning scoring highest of its 18 hazards and $30 million a year in expected losses.
How many federal disaster declarations has Summit County had?
OpenFEMA lists 4 federal disaster declarations that included Summit County since 1977, not counting 2 for COVID-19; the latest is EM-3224-CO (Hurricane Katrina Evacuation, declared 5 September 2005). Another 12 Colorado declarations were made statewide without a county list.
How many tornadoes have hit Summit County?
NOAA's Storm Prediction Center has no tornado on record touching Summit 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.