Boulder County land: flood and parcels
130,165 parcels
8.7% of Boulder County’s 130,165 parcels are in a FEMA flood zone.
County roll 2026 · Map data Oct 26, 2026
- Acres on the roll456,356
- In a FEMA flood zone8.7%special flood hazard area
Property tax calendar
Colorado 2026 taxes: bills go out in January 2027; first half due March 1, 2027, second half June 15, 2027.
- First half
- March 1, 2027On the 2026 values; or pay the whole bill by April 30, 2027
- Second half
- June 15, 2027A late half accrues 1% interest a month
- Value protests
- To the assessor by June 8 (next working day when it falls on a weekend)Then to the county board of equalization
Free account: 25 parcel cards a day on the map, with watches and a saved search. Get started free
Around Boulder County
Towns and census places in Boulder County
- Longmont34,460 parcels
- Boulder34,017 parcels
- Lafayette11,539 parcels
- Louisville8,446 parcels
- Erie (Boulder County part)7,157 parcels
- Superior5,036 parcels
- Gunbarrel4,240 parcels
- Niwot1,975 parcels
All 28 places
- Allenspark1,097 parcels
- Lyons1,052 parcels
- Nederland993 parcels
- Coal Creek (Boulder County part)528 parcels
- Pine Brook Hill523 parcels
- Lazy Acres504 parcels
- Eldora426 parcels
- Paragon Estates422 parcels
- Eldorado Springs277 parcels
- Altona262 parcels
- Jamestown228 parcels
- Gold Hill201 parcels
- Ward198 parcels
- St. Ann Highlands190 parcels
- Bark Ranch189 parcels
- Crisman174 parcels
- Mountain Meadows162 parcels
- Sunshine160 parcels
- Sugarloaf156 parcels
- Tall Timber107 parcels
Flood zones and wetlands
Recorded flood claims in Boulder County
Fewer than 10 insured flood claims were recorded in Boulder County since 1978.
Land in Boulder County by useLand use on the county roll
| Land class | Parcels | Share |
|---|---|---|
| Building on record | 115,152 | 88% |
| Other or not coded | 7,160 | 5.5% |
| Institutional | 6,019 | 4.6% |
| Farm and timber | 1,834 | 1.4% |
1,834 farm and timber parcels cover 52,835 acres. County tax roll 2026 (county file Oct 2026); land class read from the roll's land-use and building fields.
Typical lot sizeThe typical lot, from the roll
The median parcel in Boulder County is 0.19 acre (112,935 parcels with a size).
Acres from the county roll, or from the parcel's own outline where the roll's figure is off by more than three times. Condominium units that share one point (each carrying the whole complex's acres) are left out of the lot sizes.
Land parcels in Boulder CountyFarm and timber parcels to start with
- 600 County Rd 82E 154.6 acres
- 2260 N 119th St 154.0 acres
- 47503 Peak To Peak Hwy 152.3 acres
- 47585 Peak To Peak Hwy 148.3 acres
- 11898 Ute Hwy 147.3 acres
- 10442 N 75th St 146.4 acres
- 1250 Eldora Rd 145.2 acres
- 1050 Pine St 144.1 acres
Farm and timber parcels of an acre or more, each with its own page of public roll facts.
Questions about Boulder County landAnswers from the public records
How many parcels are in Boulder County, CO?
130,165 parcels on the 2026 Boulder County tax roll (county file Oct 2026), covering 456,356 acres.
How much vacant land is in Boulder County, CO?
Boulder County's vacant-land class failed our aerial check (17 of 60 sampled lots were in use or doubtful: park and HOA strips, parking islands, a pond, yards, road strips), so we don't call any parcel here vacant land.
What is the typical lot size in Boulder County?
The median parcel is 0.19 acre, from 112,935 parcels with a recorded size.
How much of Boulder County is in a flood zone?
8.7% of parcels are in a FEMA special flood hazard area (National Flood Hazard Layer, as of Oct 2026). Check each parcel's own flood line before you buy.
Are there wetlands in Boulder County?
0.7% of parcels are a quarter or more wetland on the USFWS National Wetlands Inventory, a mapping guide, not a legal delineation.
Are there land prices for Boulder County?
No land-price range is shown for Boulder County yet. We print no land-price range for Boulder County yet. Some parcel cards here carry their own price range or rough estimate.
Where does this data come from?
Parcels: State of Colorado public parcels (OIT) and county assessor layers. Flood: FEMA National Flood Hazard Layer. Wetlands: USFWS National Wetlands Inventory. Towns: U.S. Census places. Every figure is counted from those files on our map.
Sources & methodSources, dates and how these figures are built
Property tax due dates
Colorado Revised Statutes 39-10-104.5, 39-5-122 and 39-8-106. Checked Oct 13, 2026.
Recorded flood claims in Boulder County
FEMA counts claims on buildings with NFIP flood insurance, so land without an insured building never shows here. Claims counted from 1978 to Sep 2026.
Source: OpenFEMA NFIP Redacted Claims v3, as of Sep 2026.
What Groundwork can price in Boulder County
Price range for a home with its land, or for land (tested on past sales; final check due Jun 2027): 85,991 parcels. Rough estimate for a home with its land, or for land: 2,662 parcels. Facts only: 430 parcels.
The card's own words; a card whose range covers a home with its land says “home + land”. Figures are on the card, never on this page.
Land sale prices
We hold this county's recorded deeds, but its file does not mark which sales are arm's-length land sales, so this page prints no land price range yet.
Sources
Parcels: State of Colorado public parcels (OIT) and county assessor layers (2026 roll, county file Oct 2026); flood: FEMA National Flood Hazard Layer (as of Oct 2026); wetlands: USFWS National Wetlands Inventory (as of Oct 2026); sales: the county's own file, through Sep 2026; counted on our map built Oct 2026.
This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data.