Flood events in Boise County, Idaho The flood events on record, by date and by year
This page is a county record of past events and claims. It does not show the flood zone or the risk of an address. For the flood map of an address, use FEMA's address search (opens in a new tab).
NCEI has 26 flood events on record for Boise County, Idaho, from 1996 through 30 Jun 2026.
The newest flood event on record is on 26 Aug 2025.
From 2016 through 2025, NCEI has 6 flood events on record for the county.
The NWS collects event reports from a variety of sources, which include (but are not limited to): county, state, and federal emergency management officials, local law enforcement officials, SKYWARN spotters, NWS damage surveys, newspaper clipping services, the insurance industry, and the general public, among others.
The National Weather Service reports property and crop damage estimates using available data at the time of event reporting. These values should therefore be considered broad estimates. Damage amounts are not adjusted for inflation.
Zone (NWS Forecast Zone): A zone is a geographic area defined by the NWS for issuing forecasts, watches, and warnings. While zones often align with counties, they can also represent smaller or subdivided areas within a county to account for differences in weather conditions, such as elevation or proximity to water. Larger-scale events—such as heat, cold, drought, and winter storms—are typically recorded by zone.
The words of the agency. Source: NOAA NCEI, Storm Events Database, page "Frequently Asked Questions", copied on .
Date of the data: NCEI storm events through . Event types on this page: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
Newest flood events on record
Flash Flood
2 miles W of GARDEN VLY
Flash Flood
11 miles NNE of LOWMAN WARM SPGS ARP
Flash Flood
8 miles NW of LOWMAN
Flood
At NEW CENTERVILLE
Flood
6 miles S of HORSESHOE BEND
Flood
21 miles SE of GARDEN VLY. Damage estimate: $100 thousand
Flash Flood
11 miles SSE of STEIRMAN
Flood
12 miles E of IDAHO CITY. Damage estimate: $8.0 million
Flash Flood
3 miles N of BANKS
Flash Flood
6 miles NE of HORSESHOE BEND
Flood
3 miles W of GARDEN VLY
Flash Flood
10 miles SSE of LOWMAN. Damage estimate: $100 thousand
Flash Flood
9 miles SW of IDAHO CITY
Flash Flood
4 miles WNW of LOWMAN
Flash Flood
At SOUTHEAST PORTION
Flash Flood
20 miles S of IDAHO CITY
Flash Flood
At NORTHEAST PORTION
Flash Flood
3 miles E of BANKS
Flash Flood
At BANKS
Flash Flood
At BANKS
Flood
At GARDEN VLY
Flash Flood
20 miles SE of IDAHO CITY
Flash Flood
20 miles SE of IDAHO CITY
Flash Flood
5 miles W of HORSESHOE BEND
Flash Flood
5 miles S of HORSESHOE BEND
A place is the text of the NCEI record: a distance and a direction from a reference place. The site does not show a place text that names a private property or reads as a person. NCEI gives no magnitude for this hazard.
Flood events by year
| Decade | Year that ends in 0 | Year that ends in 1 | Year that ends in 2 | Year that ends in 3 | Year that ends in 4 | Year that ends in 5 | Year that ends in 6 | Year that ends in 7 | Year that ends in 8 | Year that ends in 9 | All |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1950s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1960s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1970s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1980s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1990s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 5 | 0 | 6 |
| 2000s | 0 | 2 | 2 | 1 | 3 | 0 | 0 | 0 | 1 | 0 | 9 |
| 2010s | 1 | 0 | 0 | 2 | 1 | 1 | 0 | 1 | 0 | 0 | 6 |
| 2020s | 0 | 0 | 1 | 1 | 0 | 3 | 0 (part of the year) | 5 |
A darker cell has a larger count. The number is in each cell.
Flood and flash flood events are on record from 1996. The year 2026 has the events through 30 Jun 2026 only.
By month, all years
- Jan0 events
- Feb0 events
- Mar0 events
- Apr1 event
- May2 events
- Jun8 events
- Jul4 events
- Aug6 events
- Sep5 events
- Oct0 events
- Nov0 events
- Dec0 events
Beside the other counties
| Measure | Boise | All counties of Idaho | All counties of the United States |
|---|---|---|---|
| Flood events, 1996 to 2026 | 26 | 726 | 177,902 |
| Events for each 100 square miles | 1.4 | 0.9 | 5.0 |
| Events for each 10,000 residents | 32.1 | 3.8 | 5.4 |
The columns for the state and the United States total the counties. They count the events of each county in the same way as the county column. A forecast zone with another name than a county counts for the state only.
More flood events on record
| Date | Event type | Magnitude | Damage estimate | Deaths | Injuries | On record for |
|---|---|---|---|---|---|---|
| Flash Flood | not recorded | none | 0 | 0 | County |
The table has all other events on record. A damage figure is an estimate in the NCEI record.
Official channels
- NCEI Storm Events Database (opens in a new tab)Search the full NCEI record by state, county and date.
- National Weather Service: Boise, ID (opens in a new tab)The forecast office that issues the weather warnings for the county.
- FEMA Flood Map Service Center: Search By Address (opens in a new tab)Search an address to see its flood map. This site has no flood-zone data.
These links open the pages of the agencies. The site checked the links on .
Cite this page
County Hazards. "Flood events on record for Boise County, Idaho". https://countyhazards.com/county/id/boise/flood/. Data: NOAA NCEI Storm Events Database through 30 Jun 2026. Page made on .
Questions
- Which month has the most flood events on record for Boise County?
- June has 8 of the 26 flood events on record from 1996 through 30 Jun 2026.
- How many flood events are on record for Idaho?
- NCEI has 790 flood events on record for Idaho from 1996 through 30 Jun 2026. That count has every forecast zone of the state.
- How does Boise County compare with the other counties of Idaho?
- The counties of Idaho have 0.9 flood events for each 100 square miles. Boise County has 1.4.