Photo: Finetooth · CC BY-SA 3.0On FEMA’s figures, Boulder faces more hazard damage per building than 84% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Boulder gets a C− for hazard risk: higher expected damage per building than 84% of U.S. towns. Most of that expected damage is river and rain flooding (66%), then wildfire (25%). FEMA’s files show no paid flood insurance claims here.
Graded on FEMA’s expected yearly building damage per dollar of building value (NRI v1.20, December 2025), weighted by where residents live; flood claims are shown, not graded. How hazard risk is graded
What Boulder faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
River and rain flooding
Wildfire
Earthquakes
Shares are of FEMA’s expected building damage, the measure the grade uses; ranks compare each hazard’s building-damage rate with all 85,154 U.S. census tracts. In FEMA’s terms, river and rain flooding is FEMA’s “Inland Flooding” (rivers and streams overflowing their banks, or rain overwhelming drainage). FEMA defines coastal flooding as high or rising tides and storm surge, so surge damage is counted there. Drought isn’t listed: FEMA counts its losses in crops only.
What’s behind Boulder’s grade
River and rain flooding is 66% of the building damage FEMA expects in Boulder, and Boulder’s rate of river and rain flooding damage is higher than 82% of U.S. census tracts. Wildfire adds 25%, at a rate in the top 2% of U.S. census tracts.
C− higher expected damage per building than 84% of U.S. towns (21,298).
All of Boulder’s residents live in one census tract; the figures are that tract’s.
In dollars, FEMA expects about $997K a year in losses across Boulder: $707K to buildings, the rest to people and crops.
Does Boulder flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Boulder. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Boulder isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Jefferson County.The storms Boulder remembers
None of the 6 disasters declared for Jefferson County shows FEMA aid or repair money reaching Boulder itself in FEMA’s records, so these are its biggest flood-claim years.
Jefferson County has had 6 natural disasters declared by the President since 1953, most often floods, then severe storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Also 2 FEMA wildfire suppression grants (Fire Management Assistance, not a disaster declaration) for fires in Jefferson County, 2000–2012.
Get ready for what Boulder faces
A short kit for the hazards that drive the building damage here, what to check before you buy, and where neighbors get alerts.
- Turn around at flooded roads: a foot of moving water can carry off a car.
- Flood insurance usually takes 30 days to start, so buy it before the forecast.
- Keep papers and medicines up high, in a grab-and-go bag.
- Clear dead leaves and brush within 5 feet of the house.
- Sign up for local alerts and know two ways out.
- Keep N95 masks for smoky days.
- Drop, cover and hold on.
- Strap tall furniture and the water heater to the wall.
- Know how to shut off the gas.
- Look up the address on FEMA’s flood map.
- Ask the seller or landlord whether it has ever flooded, and what flood insurance costs there.
- Get a flood insurance quote early: policies usually start 30 days after you buy.
Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.
Questions about natural hazards in Boulder
Is Boulder at risk for natural disasters?
On FEMA’s National Risk Index, Boulder has higher expected damage per building than 84% of U.S. towns: C− for hazard risk. Most of the expected damage is river and rain flooding (66%) and wildfire (25%). The figures are for the one census tract the town shares with its neighbors. This is FEMA’s model of an average year for today’s buildings, not a forecast.
Is Boulder in a flood zone?
Flood zones are drawn street by street, so the answer depends on the address: look it up on FEMA’s flood map. In Jefferson County, 0.3% of all homes carry federal flood insurance.
How much is flood insurance in Boulder?
FEMA’s Community Rating System list shows no discount for Boulder’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
Is Boulder at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (66%), and Boulder’s rate for it is higher than 82% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Boulder.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Boulder’s residents lived in the 2020 census; OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Homes: Census ACS 2020–24. Preparedness tips: Ready.gov. FEMA’s model is an average of expected damage, not a forecast. How hazard risk is graded.