Idaho local data guide

Differences Between Ada County and Boise City Zoning for Livestock

Zoning for livestock in Idaho is highly dependent on whether a property is located within Boise city limits or unincorporated Ada County. Boise City maintains specific, prescriptive ordinances for keeping livestock as an accessory use to residential properties, whereas unincorporated Ada County generally allows for broader agricultural uses, subject to rural zoning standards.

Updated with grounded research as of 2026-09-06.

The short answer

The primary difference lies in the regulatory approach: Boise City enforces a structured, prescriptive code (Title 11, Chapter 09) for residential livestock as an accessory use, requiring specific lot sizes and animal units. In contrast, unincorporated Ada County offers more flexibility for agricultural activities, deferring to specific zoning district requirements like setbacks and density rather than a one-size-fits-all residential ordinance.

Key facts

Boise City Minimum Lot Size
A minimum lot size of one (1) acre is required to qualify for keeping livestock as an accessory use in Boise City.
Boise City Animal Unit Definitions
One animal unit equals: 1 horse, mule, cow, or llama; 4 sheep, goats, or swine; 12 chickens or ducks; 6 geese; or 10 rabbits.
Annexation Protection
Properties annexed into Boise City may retain existing livestock rights as legal nonconforming uses, provided animals are not removed from the property for a continuous period of two years.

Boise City: Prescriptive Residential Rules

Within the city limits, Boise regulates livestock as an 'accessory use' to residential property. The city uses a system of 'animal units' to manage density and prevent overcrowding. Because these rules are designed for residential contexts, they are strictly enforced to ensure neighborhood compatibility. Residents must ensure their property meets the 1-acre minimum before introducing any livestock, and they must adhere to defined enclosure requirements.

  • Livestock must be kept in designated enclosures such as pens, barns, or corrals.
  • The code applies to common livestock, including cattle, llamas, mules, swine, sheep, goats, rabbits, poultry, and domestic birds.
  • Violating these residential codes can lead to enforcement actions or requirements to remove the animals.

Unincorporated Ada County: Agricultural Flexibility

Properties located outside of Boise city limits fall under Ada County’s jurisdiction. These areas are typically zoned for agricultural or rural residential use, which is inherently more permissive of livestock than urban residential zoning. Rather than applying a single residential livestock ordinance, the county evaluates compliance based on the specific zoning district of the parcel (e.g., A-Open or R-1A).

Property owners in these areas should focus on identifying their specific zoning district, which dictates permitted density, required setbacks for barns and corrals, and other operational standards.

Managing Transitions and Annexations

If your property is annexed into Boise City, you are generally not required to immediately dispose of existing livestock. Boise City ordinances allow for 'legal nonconforming' status for animals present at the time of annexation. However, this status is conditional: if the animals are removed from the property for a continuous period of two years, that right expires, and future livestock usage must then comply with current Boise City code.

Common questions

How do I determine if my property is in the city or the county?

You can verify your jurisdiction by using the Ada County Assessor’s parcel search tool or the Boise City Planning and Development Services online mapping portal. These tools provide the exact zoning district for your property.

Does my HOA override Boise City or Ada County rules?

Yes, often. Even if municipal or county zoning allows for livestock, your Homeowners Association (HOA) Covenants, Conditions, and Restrictions (CC&Rs) may prohibit them entirely or impose stricter limitations. Always check your HOA bylaws before acquiring animals.

Related Idaho questions

  • How do I check the specific zoning district of my property in Ada County?
  • Are there different rules for keeping backyard chickens versus larger livestock in Boise?
  • Does my HOA override Boise City livestock ordinances?

Sources and verification