Arizona hail risk
Maricopa County has the highest hail risk in Arizona, scoring 99.5 out of 100 — rated "Very High" by FEMA's National Risk Index. Recorded hail events across Arizona have increased 37% over the past five years compared to the prior five-year period.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Maricopa County | 99.5 | Very High | 98 |
| 2 | Pima County | 91.8 | Relatively Moderate | 48 |
| 3 | Yavapai County | 89.8 | Relatively Moderate | 38 |
| 4 | Pinal County | 82.3 | Relatively Moderate | 27 |
| 5 | Coconino County | 57.1 | Relatively Low | 32 |
| 6 | Mohave County | 51.1 | Relatively Low | 20 |
| 7 | Navajo County | 34.8 | Relatively Low | 13 |
| 8 | Graham County | 32.4 | Very Low | 7 |
| 9 | Gila County | 29.3 | Very Low | 13 |
| 10 | Yuma County | 16.8 | Very Low | 1 |
| 11 | Cochise County | 15.4 | Very Low | 33 |
| 12 | Santa Cruz County | 9.9 | Very Low | 15 |
| 13 | Apache County | 8.6 | Very Low | 5 |
| 14 | La Paz County | 7.7 | Very Low | 1 |
| 15 | Greenlee County | 4.1 | Very Low | 0 |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Hail risk nationally:
Other hazard risks in Arizona:
Frequently asked questions
What is the highest hail risk county in Arizona?
Maricopa County, AZ has the highest hail risk in Arizona, with a FEMA National Risk Index score of 99.5 out of 100 (rated "Very High").
How many counties in Arizona are rated Very High for hail risk?
1 of 15 scored Arizona counties are rated "Very High" for hail risk by FEMA's National Risk Index.
What causes hail risk in Arizona?
Hail risk reflects expected annual losses from damaging hailstones to structures, vehicles, and crops. High scores cluster in the central plains and Front Range — a corridor sometimes called "Hail Alley" — where large-diameter hail is most frequent. Hail causes over $10 billion in US property damage in active years, much of it to roofs, vehicles, and crops.