373
Recorded events
22
Counties affected
5
Direct deaths
$21.9M
Property damage
Wyoming flash flood history: 373 recorded events across 22 counties between 1996 and 2025.
Decade by decade
Wyoming flash flood history by decade
The 2010s are the busiest decade on record with 184 reported flash flood events across Wyoming. Earlier decades are thinner because systematic reporting for this hazard expanded over time, not because the weather was calmer.
County ranking
Counties with the most flash flood events in Wyoming
| Rank | County | Events | Deaths | Damage | Span |
|---|---|---|---|---|---|
| #1 | Laramie County | 86 | 0 | $109K | 2000–2025 |
| #2 | Goshen County | 34 | 0 | $243K | 1997–2024 |
| #3 | Natrona County | 29 | 0 | $9.9M | 2001–2023 |
| #4 | Johnson County | 27 | 0 | $2.2M | 1997–2023 |
| #5 | Platte County | 25 | 0 | $112K | 1996–2025 |
| #6 | Fremont County | 22 | 0 | $870K | 1997–2025 |
| #7 | Albany County | 21 | 0 | $91K | 2007–2023 |
| #8 | Park County | 15 | 0 | $795K | 1997–2022 |
| #9 | Campbell County | 14 | 1 | $586K | 1998–2019 |
| #10 | Weston County | 14 | 0 | $508K | 1998–2019 |
| #11 | Sheridan County | 12 | 0 | $0 | 1996–2019 |
| #12 | Big Horn County | 10 | 0 | $158K | 1997–2024 |
| #13 | Lincoln County | 9 | 0 | $1.7M | 1997–2024 |
| #14 | Crook County | 8 | 0 | $5K | 2001–2019 |
| #15 | Sweetwater County | 8 | 0 | $1.3M | 2007–2024 |
| #16 | Hot Springs County | 8 | 0 | $1.6M | 1999–2019 |
| #17 | Washakie County | 6 | 0 | $35K | 2001–2023 |
| #18 | Carbon County | 6 | 4 | $0 | 1996–2022 |
| #19 | Niobrara County | 5 | 0 | $1.5M | 2006–2023 |
| #20 | Sublette County | 5 | 0 | $10K | 2001–2018 |
| #21 | Converse County | 5 | 0 | $12K | 1998–2019 |
| #22 | Teton County | 4 | 0 | $90K | 2007–2014 |
Significant events
Deadliest flash flood events in Wyoming
| Date | County | Scale | Deaths | Injuries |
|---|---|---|---|---|
| Jul 19, 2011 | Carbon County | — | 4 | 2 |
| Jul 23, 2008 | Campbell County | — | 1 | 3 |