Arizona recorded 292 tornadoes from 1950 through 2024, an average of 4 a year, in NOAA’s Storm Prediction Center database. They killed 3 people. The busiest year was 1972, with 17.
Tornadoes per 1,000 square miles since 1950: none under 10 10 to 25 25 to 50 50 to 75 75 to 100 over 100. Tap a county for its history.
Tornadoes by year
The rise since the 1990s is mostly better detection of weak tornadoes, not a jump in strong ones.
Tornado season in Arizona
July is the peak, with 57 tornadoes since 1950 (20% of the total).
How strong
| Rating | Estimated 3-second gust | Tornadoes |
|---|---|---|
| F0 / EF0 | Light damage: 65 to 85 mph (EF scale) | 192 |
| F1 / EF1 | Moderate: 86 to 110 mph | 76 |
| F2 / EF2 | Considerable: 111 to 135 mph | 16 |
| F3 / EF3 | Severe: 136 to 165 mph | 3 |
| F4 / EF4 | Devastating: 166 to 200 mph | 0 |
| F5 / EF5 | Incredible: over 200 mph | 0 |
| EF-U | Unknown: no damage to rate (mostly since 2016) | 5 |
The deadliest tornadoes in Arizona
| Date | Rating | Deaths in Arizona | Counties |
|---|---|---|---|
| August 27, 1964 | F2 | 2 | Pima County |
| June 23, 1974 | F1 | 1 | Pima County |
Counties with the most tornadoes
| County | Tornadoes since 1950 | Per 1,000 sq mi | Strongest |
|---|---|---|---|
| Maricopa County | 72 | 8 | F3 |
| Coconino County | 46 | 2 | EF3 |
| Pinal County | 30 | 6 | F1 |
| Yavapai County | 28 | 3 | F3 |
| Pima County | 26 | 3 | F2 |
| Navajo County | 22 | 2 | F1 |
| Cochise County | 18 | 3 | EF1 |
| Mohave County | 18 | 1 | F1 |
| Apache County | 16 | 1 | EF0 |
| Yuma County | 12 | 2 | F2 |
| Gila County | 4 | 1 | EF1 |
| Santa Cruz County | 1 | 1 | EF0 |
| Graham County | 1 | 0 | EF0 |
| La Paz County | 1 | 0 | EF0 |
Big counties collect more tornadoes simply because they are big. By area, the most tornado-dense counties are Maricopa County (8 per 1,000 sq mi), Pinal County (6 per 1,000 sq mi), Yavapai County (3 per 1,000 sq mi), Cochise County (3 per 1,000 sq mi), Pima County (3 per 1,000 sq mi).
Every county in Arizona
Staying safe
When a tornado warning is issued, act at once. Go to a basement, storm shelter or safe room. With none, use a small windowless room on the lowest floor, as far from outside walls as you can, and cover your head and neck. Mobile homes and cars are not safe places to ride out a tornado: leave early for a sturdy building or shelter. Read the full tornado safety guide and the National Weather Service advice linked below.
Sources
- NOAA Storm Prediction Center: Severe Weather Database, tornadoes 1950 to 2024 (public domain)
- NOAA Storm Prediction Center: The Enhanced Fujita Scale (EF scale)
- National Weather Service: Tornado safety
Sources last checked 1 November 2026.
Frequently asked questions
How many tornadoes does Arizona get a year?
About 4 on average from 1950 to 2024; recent years run higher because weak tornadoes are better detected.
When is tornado season in Arizona?
July has had the most. Spring and early summer bring most of them.
What was the deadliest tornado in Arizona?
August 27, 1964: 2 deaths in Arizona.