Data · July 2026 data · 15-month trend
Idaho Flood Insurance Costs
In July 2026, the average premium among Idaho NFIP policies newly written or renewed that month was $1,039. The state pays more than the country as a whole — 5.4% above the $986 national average. The figure is up 14.3% year over year. The month's tally covers 340 policy transactions across 28 counties, with Boise County posting the highest average premium at $2,230.
What we measure: Average premium among policies newly written or renewed that month (NFIP transactions) — not the official in-force average. OpenFEMA transaction data is published on a lag of roughly two months; the latest period shown reflects that lag.
Key facts — July 2026
- Average premium
- $1,039
- Avg total cost (with fees)
- $1,378
- Change (year over year)
- +14.3%
- vs national average
- +5.4%
- Policies written or renewed
- 340
- Counties reporting
- 28
Idaho trend, last 15 months
Average premium among policies newly written or renewed each month. Bars scale to the highest month shown.
| Month | Avg premium | Premium relative to highest month | Avg total cost | Policies |
|---|---|---|---|---|
| May 2025 | $689 | $904 | 778 | |
| June 2025 | $966 | $1,261 | 350 | |
| July 2025 | $909 | $1,209 | 389 | |
| August 2025 | $924 | $1,211 | 390 | |
| September 2025 | $966 | $1,270 | 364 | |
| October 2025 | $966 | $1,279 | 401 | |
| November 2025 | $1,009 | $1,335 | 405 | |
| December 2025 | $1,060 | $1,401 | 316 | |
| January 2026 | $1,143 | $1,507 | 270 | |
| February 2026 | $1,083 | $1,420 | 372 | |
| March 2026 | $950 | $1,258 | 541 | |
| April 2026 | $1,077 | $1,412 | 389 | |
| May 2026 | $744 | $966 | 728 | |
| June 2026 | $1,025 | $1,334 | 320 | |
| July 2026 | $1,039 | $1,378 | 340 |
County breakdown — July 2026
Sorted by average premium, highest first. Rows labeled with a FIPS code are reporting areas without a matched county name. Watch the policy count before reading much into small-county averages.
| County | Avg premium | Premium relative to highest county | Avg total cost | Policies |
|---|---|---|---|---|
| Boise County | $2,230 | $2,703 | 2 | |
| Madison County | $2,009 | $2,518 | 3 | |
| Benewah County | $1,641 | $2,073 | 7 | |
| Teton County | $1,573 | $2,040 | 4 | |
| Lemhi County | $1,541 | $1,928 | 6 | |
| Shoshone County | $1,503 | $1,909 | 14 | |
| Fremont County | $1,362 | $1,679 | 1 | |
| Valley County | $1,315 | $1,849 | 2 | |
| Payette County | $1,118 | $1,391 | 3 | |
| Ada County | $1,111 | $1,468 | 132 | |
| Blaine County | $1,040 | $1,426 | 23 | |
| Bonner County | $992 | $1,346 | 13 | |
| Lewis County | $958 | $1,315 | 2 | |
| Kootenai County | $953 | $1,227 | 15 | |
| Cassia County | $928 | $1,167 | 2 | |
| Gooding County | $923 | $1,206 | 5 | |
| Bannock County | $906 | $1,231 | 5 | |
| Latah County | $896 | $1,189 | 19 | |
| Bonneville County | $875 | $1,195 | 10 | |
| Canyon County | $787 | $1,104 | 39 | |
| Adams County | $782 | $1,108 | 2 | |
| Bingham County | $745 | $976 | 9 | |
| Butte County | $623 | $807 | 1 | |
| Elmore County | $601 | $825 | 10 | |
| Owyhee County | $570 | $745 | 1 | |
| Washington County | $565 | $739 | 3 | |
| Twin Falls County | $460 | $727 | 6 | |
| Jefferson County | $430 | $579 | 1 |
Use this data
Download Idaho CSV (idaho.csv) — free to reuse with attribution. Read the full methodology for formulas, update cadence, and limitations. Source: FEMA OpenFEMA NFIP policy transaction data (NFIP Redacted Policies v3).
"Idaho Flood Insurance Costs." Out of the Storm News Flood Insurance Cost Index, July 2026, based on FEMA OpenFEMA NFIP policy transaction data. https://outofthestormnews.com/flood-insurance/costs/idaho
Related guides
Compare county data, then use the editorial guides to understand how NFIP coverage and pricing work in practice.