Storm risk in Jefferson County, Colorado
FEMA rates Jefferson County Relatively High for natural-hazard risk overall, 160th of 3,144 rated counties. For a roof the three that matter are hail (Very High), strong wind (Relatively High) and tornado (Relatively High). NOAA logged 209 hail reports here from 2014 to June 2026.
FEMA National Risk Index, version December 2025, retrieved October 8, 2026. Planning-level county ratings.
Each dot is the county’s score from 0 to 100 against all rated U.S. counties; the bar colour is FEMA’s rating band.
Hazard by hazard
| Hazard | Rating | Score (0 to 100) | Rank in U.S. | Rank in CO | Expected yearly loss |
|---|---|---|---|---|---|
| Overall | Relatively High | 94.9 | 160 | 2 of 64 | $194,997,730buildings |
| Hail | Very High | 99.8 | 7 | 3 of 64 | $56,274,388buildings |
| Strong wind | Relatively High | 92.6 | 233 | 5 of 64 | $972,107buildings |
| Tornado | Relatively High | 96.5 | 111 | 4 of 64 | $21,964,401all exposure |
Rank 1 is the highest score. Expected annual loss is a county total in dollars per year, not a figure per home; the overall, hail and wind rows count buildings only, the tornado row all exposure.
Jefferson County in plain numbers
- FEMA's overall rating for Jefferson County is Relatively High, score 94.9 of 100, 160th of 3,144 rated counties.
- Hail: Very High (score 99.8), 7th nationwide and 3rd of 64 counties in Colorado.
- Expected yearly hail loss to buildings: $56,274,388 for the whole county, about $501.59 per $1 million of building value.
- NRI's hail record averages 6.9 hail events a year in the county.
- Strong wind: Relatively High (score 92.6), 233rd nationwide; expected yearly loss to buildings $972,107, about $8.66 per $1 million of building value.
- Tornado: Relatively High (score 96.5), 111th nationwide; total expected yearly loss $21,964,401.
- Buildings in the county are valued at 112.2 billion dollars in the index; population 582,825.
- Social vulnerability is rated Very Low and community resilience Relatively High.
- NOAA logged 209 hail reports in Jefferson County from 2014 to June 2026; hail of 1 inch or more fell on 45 days and the largest stone was 2.75 inches.
- 1 of our cities is in the county: Arvada.
- 26 ZIP Code Tabulation Areas have more than half of their land area in Jefferson County.
- Our guide range for a 2,000 sq ft asphalt roof in Arvada is $7,560 to $16,740.
Where large hail was reported
FEMA scores the county as a whole. NOAA’s storm reports show where inside it the big stones fell.
Reported hail locations, Jefferson County
- 1111 to 1.74 in
- 281.75 to 2.74 in, golf ball to tennis ball
- 12.75 in and up, baseball
Largest plotted stone: 2.75 in. Bigger dots are bigger stones.
171 reports of 1 inch or larger have coordinates; the map shows the 140 largest. Each dot is a reported location, not a storm path.
Sources: NOAA, Census county outlineCities and ZIP areas in Jefferson County
1 city in this county is on PickARoofer. ZIP Code Tabulation Areas are Census shapes that approximate ZIP codes; where we have a city’s ZIPs, the share is the part of each area’s land that lies in this county. 26 such areas have more than half their land here.
| City | ZIP areas (share of land in the county) | Pages |
|---|---|---|
| Arvada | 80002 (96%), 80003 (86%), 80004 (100%), 80017 (0%), 80025 (0%) | Roofers |
- Jefferson County hail history, 2014 to 2026
- Hail history in Colorado
- Insurance claim deadlines by state
Storm hit your roof in Jefferson County? A free inspection tells you if there is damage. One local roofer answers, not five.
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How high is storm risk in Jefferson County?
FEMA's National Risk Index rates Jefferson County Relatively High overall. By peril: hail Very High, strong wind Relatively High, tornado Relatively High. The highest-scoring of the three for this county is hail (score 99.8).
How many hail reports has NOAA logged in Jefferson County?
209 reports between 2014 and June 2026 in NOAA's Storm Events Database. A report is one entry for one storm in one county, so counts follow where people live as well as where hail fell.
What does expected annual loss mean?
It is FEMA's estimate of the average yearly loss from a hazard, in dollars, summed over the county. It is a county total, not a figure per home, and it is built for comparing counties, not for pricing one house.
Does a high rating mean my roof will be damaged?
No. The index compares counties at planning level. It cannot say what will happen on your street. After a storm, a roof inspection is the only way to know.
How does Jefferson County compare with the rest of Colorado?
For hail it ranks 3rd of 64 rated counties in the state; for strong wind 5th of 64; for tornado 4th of 64.
Other Colorado counties
Sources: FEMA National Risk Index, version December 2025, retrieved October 8, 2026; NOAA Storm Events Database; Census Bureau ZCTA-to-county relationship file (2020). This product uses the Federal Emergency Management Agency's National Risk Index dataset 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). Planning-level information, not an inspection and not insurance advice.