Blog · October 14, 2026 · Colorado
Grand County Flood Zone Map in Colorado
How to check whether a property in Grand County sits in a FEMA flood zone, and what the answer means for a buyer near Hot Sulphur Springs.
Main page: Grand County, CO GIS & Parcel Viewer (official map link, Grand County facts and neighboring maps).
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Is that lot in Kremmling in a flood zone? The Grand County flood zone map answer comes from FEMA, and it's free to look up. FEMA's free Flood Map Service Center and the Grand County parcel viewer answer it together.
Next: FEMA's search tool, the zone labels you'll see for Grand County, and how the parcel record confirms which tract you're on.
Look up the Grand County flood zone map step by step
Open the FEMA Flood Map Service Center and type a county street address, say one in Winter Park. The site returns the effective Flood Insurance Rate Map (FIRM) panel covering that Winter Park location, which you can view or download. If the PDF panel for Grand County is hard to read, FEMA's National Flood Hazard Layer viewer draws the zones over aerial imagery; zoom to the parcel near Hot Sulphur Springs and click. Switch to the Grand County ArcGIS parcel map and find the same parcel near Hot Sulphur Springs. Match the Grand County lines and acreage to the FEMA view, since flood maps do not draw property lines in detail.
Opening the Grand County parcel viewer
The county's own public map is the Grand County ArcGIS parcel map, built on an Esri ArcGIS web map, and it opens without an account for parcels in Granby and the rest of the county. Most people find their Grand County tract fastest by searching an address in Hot Sulphur Springs, then clicking the outline. Bookmark our Grand County page too; it tracks the official Colorado link if it moves and lists the maps around Granby.
What the flood zone letters mean
For a lot in Winter Park, the label matters more than the color: A and V zones are Special Flood Hazard Areas, defined by a 1-percent annual chance of being flooded. Zone AE near Hot Sulphur Springs means FEMA published a base flood elevation; plain Zone A means no detailed elevation was studied. Shaded Zone X around Winter Park sits in the moderate band between the 100-year and 500-year floods. Unshaded Zone X near Hot Sulphur Springs is minimal risk.
Unmapped creeks in Grand County
Small streams and ditches near Winter Park may not be studied in detail, which is why it's worth walking the ground after a heavy rain.
Seller questions about flood history
Request any past flood claims history for a Grand County property before closing; it tells you more than the map alone. Quotes for land near Parshall depend on the zone and the building's elevation, so bring both to the agent.
Map dates and floodways in Grand County
When FEMA restudies streams in the county, preliminary maps are posted before they take effect, and a lot near Parshall can move in or out of a zone. A floodway on a county panel marks the part of the floodplain that carries the main flow, and it's treated more strictly than the rest of the zone near Parshall.
Flood insurance and building rules in Grand County
Lenders watch the zone closely on Grand County properties. When a county home falls inside an A or V zone and carries a federally backed mortgage, flood insurance is mandatory, provided the community near Winter Park takes part in the National Flood Insurance Program. In Zone X near Winter Park, federal rules do not require a policy; pricing a policy for land near Hot Sulphur Springs is still worth a call. Where a structure near Winter Park looks higher than the shading suggests, FEMA's LOMA process allows a review; a surveyor near Hot Sulphur Springs can supply the elevation data. Building or filling inside a mapped zone near Winter Park has to meet local floodplain rules, and the building office serving Hot Sulphur Springs explains the steps.
Quick answers for Grand County
What does 100-year flood mean for Grand County land?
Not at all; a Grand County tract in that zone has a 1-percent chance of flooding every year, not a once-a-century schedule.
What if FEMA's map is wrong about my house near Grand Lake?
An owner near Grand Lake can request a Letter of Map Amendment from FEMA with elevation data, most frequently from a professional surveyor.
My house near Grand Lake is in Zone X. Is insurance required?
Not under federal rules; Zone X in Grand County is outside the Special Flood Hazard Area, though a lender can still require coverage.
What is a base flood elevation for a Grand County property?
Near Grand Lake, it's the projected water surface in the base flood, and a surveyor compares the building near Kremmling to it.
Is Zone AE near Grand Lake high risk?
Yes, a parcel near Grand Lake in Zone AE is high risk: a 1-percent-annual-chance floodplain where FEMA lists a base flood elevation.
Can I build in a flood zone in Grand County?
Building in a Special Flood Hazard Area near Kremmling most frequently needs a floodplain permit and may require elevating the structure, so check with the county floodplain administrator.
Open the official Grand County, CO parcel map Grand County in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.