271 flood insurance claims·$2.1M paid·8 federal flood & hurricane disasters
Share of the whole county outline, rivers and lakes included; parts FEMA hasn’t mapped count as zero.
Shaded areas are FEMA’s mapped flood hazard zones in and around Frederick County, Maryland. Zoomed out they are simplified; at street level the map switches to FEMA’s exact layer. Tap anywhere to check that spot, or search an address above.
Over the last 30 years, Frederick County has experienced 219 flood events and 92 flash flood events, which resulted in 6 deaths, alongside 2 tropical storm events. Severe weather is frequently driven by slow-moving low-pressure systems, cold fronts, and tropical moisture producing heavy rainfall rates. For instance, a slow-moving closed upper-level low brought rain rates exceeding two inches an hour in May 2025, leading to localized rainfall totals of four to eight inches and flash flooding. Similarly, a slow-moving cold front in July 2025 produced training thunderstorms with localized rainfall amounts up to six inches.
National Flood Insurance Program claims data shows impacts across multiple zones, indicating that risks extend beyond designated high-risk areas. Zone A accounts for 139 claims with an average payout of $12,205 and an average recorded water depth of 5 inches. Zone X records 88 claims with an average payout of $7,388 and an average water depth of 14 inches, while Zone X_UNSHADED accounts for 31 claims with an average payout of $11,850 and an average water depth of 4 inches. Homeowners, real estate agents, and journalists should pay the closest attention to properties located within Zone A, as well as properties in Zone X and unshaded Zone X areas where significant claims and water depths have also been documented.
Summary written from NOAA storm reports and NFIP claims for this county. Not a prediction.
20% of Frederick County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.
175 NFIP claims with a recorded rated flood zone, 1978 to date. The zone is the one FEMA used to rate that policy, which may not match today’s map. Source: OpenFEMA NFIP claims.
In flood insurance claims here that reported a flood depth, the average was 7 inches.
Drawn to scale against an 80-inch door. Even a few inches soaks flooring, the bottom of the drywall and anything plugged in near the floor.
Average of the depths reported on claims (zero and implausible values left out); FEMA’s record doesn’t say exactly where each depth was measured. Source: OpenFEMA NFIP claims.
The worst year was 1996, with 64 claims and $939,800 paid, the year of Severe Storms and Flooding and Severe Storms and Flooding Assoc With Tropical Storm Fran.
Bar height is scaled by square root so ordinary years stay visible next to the worst one. NFIP claims by year of loss. Source: OpenFEMA.
138 NOAA storm reports from Frederick County describe what happened, in the words of the forecasters who covered it. Read the Maryland flood stories →
23 federal disaster declarations since 1971, 8 of them floods, coastal storms or hurricanes.
| Disaster | Began |
|---|---|
| Severe Winter Storm | Jan 23, 2026 |
| Severe Storms And Flooding | May 15, 2018 |
| Severe Winter Storm And Snowstorm | Jan 22, 2016 |
| Hurricane Sandy | Oct 26, 2012 |
| Hurricane Irene | Aug 26, 2011 |
| Severe Winter Storms And Snowstorms | Feb 5, 2010 |
| Hurricane Katrina Evacuation | Aug 29, 2005 |
| Hurricane Isabel | Sep 18, 2003 |
Weather and water disasters only; most recent first. Source: OpenFEMA Disaster Declarations.
313 since 1996: 92 flash floods and 219 river or area floods.
| Event | Date | Damage |
|---|---|---|
| Flash Flood | Jul 31, 2025 | — |
| Flood | May 14, 2025 | — |
| Flash Flood | May 5, 2025 | — |
| Flash Flood | Aug 29, 2024 | — |
| Flood | Dec 23, 2022 | — |
| Flood | Dec 22, 2022 | — |
| Flood | May 7, 2022 | — |
| Flood | May 6, 2022 | — |
— = no damage estimate in the record. Source: NOAA Storm Events Database.
Flash Flood · Jul 31, 2025. A slow moving cold front combined with a highly unstable atmosphere along with tropical moisture to produce slow moving thunderstorms with heavy rainfall. Some of these storms trained over the same areas, resulting in scattered to numerous instances of flash flooding. Total rainfall amounts in areas with flash flooding averaged two to four inches, though some localized amounts up to six inches were observed.
Flood · May 14, 2025. A slow moving closed upper level low originating from the Gulf of America brought anomalous moisture into the area. A long duration period of rain ensued, with rain rates exceeding two inches an hour during the afternoon of May 13th. The slow moving storms coupled with training led to localized rainfall totals of four to eight inches across western Maryland, with lesser amounts of two to four inches across central…
Flash Flood · May 5, 2025. An area of upper level low pressure brought repetitive rounds of slow moving thunderstorms to parts of central Maryland. The heaviest rain fell across Frederick County, Maryland where to two to four inches of rain were observed.
Flash Flood · Aug 29, 2024. Heavy rainfall along a stalled boundary led to instances of flash flooding.
National Weather Service narratives, lightly trimmed. Source: NOAA Storm Events Database.
Every colour on the map above is a place on this drawing: where the ground sits relative to the flood FEMA plans for.
If a building in Frederick County is in a high-risk zone (A or V) and its mortgage comes from a federally regulated or insured lender, or is federally backed, flood insurance is required.
Outside those zones it is optional, and often worth having: from 2014 to 2024 nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area. Since Risk Rating 2.0, NFIP premiums are set for each building, so the only reliable price is a quote: FloodSmart.gov or a local agent.