Pitkin County, CO zoning map, flood zone and property lines by address
Free, no account. Or open the Colorado map and tap a lot.
Towns in Pitkin County: Aspen, Snowmass Village.
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA's countywide study for Pitkin County has 104 FIRM panels, the newest effective August 2019; no coastal V zones are mapped in it.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Pitkin house comes from a licensed surveyor and is often on file with the county or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the Colorado public parcel layer (Governor's Office of Information Technology, from the counties that share their parcels), so a Pitkin lot shows the same lines the county assessor draws. Pitkin County covers about 621,249 acres of land and 1,599 acres of water.
Mapped lines are approximate. The Pitkin County assessor keeps the parcel record (Pitkin County website); a licensed surveyor sets the true corners.
Zoning
Pitkin County zones its unincorporated land, and Aspen, Snowmass Village each zone the land inside their limits. ParcelSheet shows the use the county assessor lists for the lot and links the county planning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Colorado's county and city zoning powers (C.R.S. Title 30, Article 28, and Title 31, Article 23), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Pitkin lot can add one depends on its district; the county planning office has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Septic and soil
ParcelSheet reads the USDA soil survey at the lot: the soil's name, its septic absorption rating and whether it is prime farmland. Pitkin County is soil survey area CO654, Holy Cross Area, Colorado, Parts of Eagle, Garfield, Mesa, Pitkin, and Summit Counties, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Pitkin County needs a permit from the Pitkin County local public health agency under CDPHE Regulation 43.
Setbacks
Setbacks in Pitkin County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the county zoning office gives them for the lot's district, and Aspen and Snowmass Village for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Pitkin lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Pitkin County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA's countywide flood map for Pitkin County has 104 panels, the newest effective August 2019. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Pitkin County?
Open the Colorado map, type the address, and the parcel outline from the Pitkin County assessor shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Pitkin County?
Zoning in Pitkin County is set by the county for unincorporated land and by each city (such as Aspen, Snowmass Village) inside its own limits. ParcelSheet shows the use code the county assessor lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Pitkin County?
Under Colorado's county and city zoning powers (C.R.S. Title 30, Article 28, and Title 31, Article 23), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Pitkin County ask the zoning office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in Pitkin County?
Yes. A new or changed septic system in Pitkin County needs a permit from the Pitkin County local public health agency under CDPHE Regulation 43. ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area CO654 (Holy Cross Area, Colorado, Parts of Eagle, Garfield, Mesa, Pitkin, and Summit Counties).
What can I build on 5 acres in Pitkin County?
Zoning in Pitkin County is set by the county for unincorporated land and each city inside its own limits (such as Aspen, Snowmass Village). The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the planning office has the district and its rules. See the Pitkin County website.
What are the residential setbacks in Pitkin County (2026)?
Setbacks in Pitkin County come from the zoning code of the county, or of the city when the lot is inside city limits: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the zoning office gives them for the district. See the Pitkin County website.
Next to Pitkin County: Chaffee County, Eagle County, Garfield County, Gunnison County, Lake County, Mesa County.
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