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Buying land in Costilla County, Colorado: what to check

Costilla County covers 1,228 square miles of land and 3 of water in Colorado, with about 3,686 residents in 2024 (up 5.4% since 2020). The 2020 Census counted 100% of its land as rural and 0% of residents as living in urban areas. Farms operate 46% of the county's land. Below: how much of Costilla County floods, what its soils allow, what farmland is worth and how often it's in drought, from free public data with every source linked.

Check a location in Costilla CountySee a sample report

Costilla County at a glance

In the 100-year floodplain

under 1%

About the state's county median (under 1%)

FEMA National Risk Index

Hydric (wetland-type) soils

2.1%

Above the state's county median (1.7%)

USDA NRCS Web Soil Survey (SSURGO)

Soils very limited for septic

69%

USDA NRCS Web Soil Survey (SSURGO)

Farm land value, 2022

$996/acre

Below the state's county median ($2,779)

USDA NASS, 2022 Census of Agriculture

Weeks in severe drought

29%

Share of weekly maps, 2021–2026

U.S. Drought Monitor county statistics

Land classed rural

100%

Census 2020 Census urban and rural classification

What to check before buying land in Costilla County

Ordered by what Costilla County's numbers point to. Every parcel differs, so treat this as where to look first.

  1. 1.Budget for a perc test and maybe an engineered septic

    USDA rates 69% of Costilla County's mapped soils "very limited" for conventional septic absorption fields and 19% "not limited".

    Without city sewer you need a septic permit from the county or state health department. Make the offer contingent on a passing soil or perc test; mound and aerobic systems can cost several times a conventional one.

    Guide: Perc tests and septic systems

  2. 2.Check slope where you'd build and where the driveway goes

    47% of Costilla County's mapped soils have an average slope over 15% (USDA SSURGO).

    Steep ground means grading, retaining walls, longer driveways and erosion control. Compare the slope at the house site and along the access route, not just the parcel average.

    Guide: Terrain and slope

  3. 3.Find out where the water comes from

    At least half of Costilla County was in severe drought (D2) or worse in 29% of the 262 weekly U.S. Drought Monitor maps from 2021 to 2026. Colorado allocates water by permit or water right, so a well or pond isn't automatic.

    Ask whether the land has a public water connection, an existing well (and its log and yield), or neighbors' well depths from the state well database. For a new well, check permits and typical depth with the state agency first.

    Guide: Wells, public water and water rights

  4. 4.Confirm legal road access and power

    The 2020 Census classified 100% of Costilla County's land area as rural.

    Rural tracts are often sold without recorded access or a power line nearby. Get the title company to confirm a recorded easement or public road frontage, and ask the electric co-op what a line extension costs.

    Guide: Road access and landlocked land

  5. 5.Confirm the flood zone at your exact spot

    under 1% of the county's area is in the 1%-annual-chance (100-year) floodplain FEMA's National Risk Index uses for inland flooding; 4.3% of its mapped soils flood occasionally or frequently.

    Even where little of the county floods, creeks and low spots do. Check the FEMA zone at the building site and the driveway route.

    Guide: Flood zones before buying land

  6. 6.Sanity-check the price per acre

    Farm real estate in Costilla County averaged $996 an acre including buildings in the 2022 Census of Agriculture, and under 1% of its mapped soils are prime or of statewide importance.

    Compare the asking price with recent sales of similar tracts, not the county average, which mixes cropland, pasture, timber and homesites. If an ag tax valuation applies, ask what the rollback taxes would be if you change the use.

    Guide: Land due diligence checklist

Flood zones, wetlands and water in Costilla County

Area in the 1%-annual-chance (100-year) floodplain
under 1%, 21st lowest of 64 in Colorado FEMA National Risk Index
Mapped soils that flood occasionally or frequently
4.3% USDA NRCS Web Soil Survey (SSURGO)
Hydric soils (a federal wetland indicator)
2.1% USDA NRCS Web Soil Survey (SSURGO)
Poorly or very poorly drained soils
3.7% USDA NRCS Web Soil Survey (SSURGO)
Surface water (lakes, rivers, reservoirs)
3 sq mi Census 2024 Gazetteer Files
Drought on 2026-10-27
92% moderate or worse, 3% severe or worse U.S. Drought Monitor county statistics

The floodplain share is the area FEMA's National Risk Index counts as exposed to inland flooding, mostly mapped 100-year flood zones. It says how common flood-prone land is in Costilla County, not whether a given parcel floods. For that, look up the zone at your exact point on the FEMA Flood Map Service Center or run the free check.

Soils and terrain

Prime farmland
0% USDA NRCS Web Soil Survey (SSURGO)
Prime only if drained, irrigated or protected
26% USDA NRCS Web Soil Survey (SSURGO)
Farmland of statewide importance
under 1% USDA NRCS Web Soil Survey (SSURGO)
Average slope over 15%
47% USDA NRCS Web Soil Survey (SSURGO)
Very limited for septic absorption fields
69% USDA NRCS Web Soil Survey (SSURGO)
Not limited for septic absorption fields
19% USDA NRCS Web Soil Survey (SSURGO)

Shares of Costilla County's soil-surveyed land (about 786,032 acres, open water excluded), using each map unit's dominant condition in USDA's SSURGO soil survey. Soils change within a few hundred feet, so the soil at your building site is what matters.

Farms and land use

Farms (2022)
159 USDA NASS, 2022 Census of Agriculture
Share of the county's land in farms
46% USDA NASS, 2022 Census of Agriculture
Average farm size
2,294 acres (median 80) USDA NASS, 2022 Census of Agriculture
Average value of land and buildings
$996 per acre, 2nd lowest of 63 in Colorado USDA NASS, 2022 Census of Agriculture
Cropland
41,930 acres USDA NASS, 2022 Census of Agriculture
Pasture and rangeland
149,029 acres USDA NASS, 2022 Census of Agriculture
Irrigated land
18,456 acres USDA NASS, 2022 Census of Agriculture

Natural hazard ratings

FEMA's National Risk Index rates each hazard for Costilla County relative to every other U.S. county. Overall risk: Very Low.

  • DroughtRelatively Moderate
  • LandslideRelatively Low
  • LightningRelatively Low
  • WildfireRelatively Low
  • Winter weatherRelatively Low
  • EarthquakeVery Low
  • HailVery Low
  • Heat waveVery Low
  • River and inland floodingVery Low
  • Strong windVery Low
  • TornadoVery Low

FEMA National Risk Index, December 2025

Questions about buying land in Costilla County

How much of Costilla County, CO is in a flood zone?

About under 1% of Costilla County's area is in the 1%-annual-chance (100-year) floodplain used by FEMA's National Risk Index (December 2025), 21st lowest of 64 counties in Colorado. Whether a given parcel is in a flood zone depends on its exact location, so check the FEMA map at your pin.

How much does land cost per acre in Costilla County?

The 2022 Census of Agriculture put the average value of farm land and buildings in Costilla County at $996 an acre, 2nd lowest of 63 counties in Colorado (the median Colorado county was $2,779). It's a self-reported average across farms, so small homesites and recreational tracts often sell for more per acre.

Will a septic system work on land in Costilla County?

Often, but test first. USDA soil surveys rate 69% of Costilla County's mapped soils very limited for conventional septic absorption fields, usually because of wetness, slow permeability, shallow rock or flooding. A perc or soil test on the parcel decides what system the health department will permit.

Is there good farmland in Costilla County?

0% of Costilla County's mapped soils are prime farmland, 26% are prime only if drained, irrigated or protected from flooding, and under 1% are farmland of statewide importance (USDA SSURGO). The 2022 Census of Agriculture counted 159 farms averaging 2,294 acres.

How often is Costilla County in drought?

Since 2021, at least half of the county was in severe drought or worse in 29% of weekly U.S. Drought Monitor maps, and in extreme drought in 16%. On 2026-10-27, 92% of the county was in moderate drought or worse.

Can I check a specific property in Costilla County?

Yes. Enter the address or drop a pin anywhere in Costilla County on the free check. It shows which checks return data at that exact point, and the full report costs $29: flood zone, slope, soils, wetlands, roads, power lines, wildfire and more, each with its source. It is a screen of public maps, not a survey, title search or perc test.

Check the parcel, not just the county

County numbers tell you what to look for. The free check looks at your exact point in Costilla County: flood zone, slope, soils, wetlands, roads, power and more. The full report is $29.

Check a location in Costilla County

What these numbers can't tell you

  • County shares describe Costilla County as a whole; a parcel can be entirely in or out of a flood zone, wetland or poor soil.
  • It doesn't look at the whole parcel, its boundaries, title, easements, zoning or permits.
  • It isn't a survey, appraisal, elevation certificate, soil or perc test, or Phase I environmental site assessment.
  • It can't see local distribution power lines, driveways, legal access, wells or mineral rights.
  • Maps lag behind the ground, and distances are straight-line, not driving distance.

Sources and vintages

Summarized per county by our build script on 2026-10-31. County figures cover the whole county; checks on the report are at your point.