Every hurricane season, people try to buy flood insurance as a storm approaches, only to learn it will not start in time. Most policies from the National Flood Insurance Program (NFIP) have a 30-day waiting period before coverage begins.
Why the wait exists
The waiting period stops people from buying insurance only when they know a flood is coming, which would make insurance unaffordable for everyone else. Coverage starts at 12:01 a.m. on the 30th day after you apply and pay.
The exceptions
The 30-day wait does not apply in a few situations:
- Buying or refinancing a home. If a lender requires flood insurance when you take out, increase, extend or renew a loan, coverage can start at closing.
- After a flood map change. If a new map puts your home in a high-risk zone, there is a one-day wait for a policy bought within 13 months of the change.
- After a wildfire on federal land. If flooding on your property is caused by post-fire conditions on nearby federal land, the wait may be waived in some cases.
Private flood insurers set their own rules. Some have shorter waits, often 10 to 15 days, and some match the NFIP.
When to buy
The best time is now, before hurricane season or the spring rains. The Atlantic hurricane season starts June 1. Snowmelt and spring storms bring river flooding from March to June in much of the country.
If a storm is already named and heading your way, a new policy almost certainly will not start in time.
What NFIP covers
- Building coverage up to $250,000 for a home: the structure, electrical and plumbing systems, furnace, water heater, built-in appliances and more.
- Contents coverage up to $100,000, bought separately: furniture, clothing, electronics.
- Basements have limited coverage. Items like carpet, furniture and most belongings stored in a basement are not covered.
Renters can buy contents-only coverage.
How many people have it
Only about 1 in 35 US homes has an NFIP policy, according to FEMA’s 2026 data. Even in counties with frequent flooding, many homes are uninsured. You can see the share for any county on its page here, and compare states on our flood insurance page.
Questions people ask
Do I need flood insurance if I am not in a flood zone? It is not required, but floods often hit homes outside mapped zones, and policies there usually cost less.
Does FEMA disaster aid replace flood insurance? No. FEMA grants are capped and only cover basic repairs to make a home livable. They are only available after a major disaster declaration that includes your county.
Where do I buy it? Most home insurance agents sell NFIP policies. You can also call the NFIP at 1-877-336-2627 for help finding an agent.