Longmont, CO
Local storm history & FEMA National Risk Index data
Longmont is rated Relatively Moderate for overall natural hazard risk — near the middle compared to other US counties — based on FEMA's National Risk Index for Boulder County, CO. The county's highest-rated hazards are lightning, hail, and wildfire.
Storm events near Longmont
NOAA-recorded tornado, hail, and flood events within 25 miles of Longmont's center, 2016–2026 — the only hazards NOAA reports with exact coordinates, so these counts are specific to Longmont itself, not the whole county.
County-wide hazard risk
Every other hazard FEMA and NOAA track — including drought — is only scored at the county level. These are Boulder County's FEMA National Risk Index scores, covering Longmont along with the rest of the county, not a Longmont-specific figure.
| Hazard | NRI score | Rating |
|---|---|---|
| Wildfire | 97.9 | Relatively High |
| Inland Flooding | 92.2 | Relatively Moderate |
| Coastal Flooding | — | Not Applicable |
| Earthquake | 80.5 | Relatively Low |
| Heat Wave | 60.4 | Relatively Low |
| Tornado | 92.6 | Relatively High |
| Avalanche | 87.3 | Relatively High |
| Cold Wave | 70.6 | Relatively Moderate |
| Drought | 38.4 | Relatively Low |
| Hail | 98.4 | Relatively High |
| Hurricane | — | Not Applicable |
| Ice Storm | 72.9 | Relatively Moderate |
| Landslide | 89.9 | Relatively Moderate |
| Lightning | 99 | Very High |
| Strong Wind | 86 | Relatively High |
| Tsunami | — | Not Applicable |
| Volcanic Activity | 64.8 | Very Low |
| Winter Weather | 96.1 | Relatively High |
Source: FEMA National Risk Index v1.20.0, December 2025. See the methodology page for definitions, or the full Boulder County risk profile for disaster declarations, social vulnerability, and climate projection data.
Other cities in Boulder County:
More on Boulder County:
Frequently asked questions
What natural hazards is Longmont, CO at risk of?
Longmont is rated Relatively Moderate for overall natural hazard risk by FEMA's National Risk Index — near the middle compared to other US counties. The highest-rated hazards for Boulder County, where Longmont is located, are lightning, hail, and wildfire.
What is Longmont's biggest natural hazard risk?
Lightning is the highest-rated hazard for Boulder County, where Longmont is located, scoring 99 out of 100 on FEMA's National Risk Index (rated "Very High").
Is Longmont a high-risk area for natural disasters?
Somewhat — Longmont carries near the middle compared to other US counties for overall natural hazard risk, per FEMA's National Risk Index rating of "Relatively Moderate" for Boulder County.
Has Longmont had tornadoes, hail, or flooding?
NOAA has recorded 6 tornado, 477 hail, 15 inland flooding events within 25 miles of Longmont since 2016.