Wyoming Fence Permit Rules: What Homeowners Need to Know

Wyoming's Fence Laws Reflect Its Open Range Heritage

Wyoming's fence laws are unlike those in most states because they're built around the state's open range tradition. The state's primary fence statutes — Title 11, Chapter 28 of the Wyoming Statutes — deal extensively with livestock fencing, lawful fence definitions, and partition fence cost sharing. Residential fence regulations, by contrast, are handled entirely at the city and county level.

The Wyoming Department of Fire and Electrical Safety adopts statewide building codes based on the International Code Council standards. The state concluded adoption of the 2024 International Codes in June 2024, and local jurisdictions are required to adopt equivalent or more stringent standards within six months. However, residential fence permits and zoning rules are administered by cities and counties, not the state.

This means fence rules in Cheyenne are different from those in Casper, which are different from rules in rural Natrona County or a ranching community near Sheridan. You need to check with your specific jurisdiction before building.

For a broader look at how fence permit rules work across the country, see our national guide to fence permits.

Open Range: Wyoming's Most Distinctive Fence Issue

The single most important thing to understand about fences in Wyoming — especially if you're new to the state — is the open range doctrine.

Wyoming is a "fence out" state for cattle and domesticated bison. This means that if you don't want livestock on your property, it's your responsibility to build a fence to keep them out. Your neighbor's cattle can legally wander onto your unfenced land, graze your yard, damage your garden, and you have no legal claim for damages against the livestock owner. Only when you have a lawful fence (as defined by state statute) and an animal breaks through it can you recover damages.

The exception is sheep. Wyoming is a "fence in" state for sheep, meaning sheep owners are responsible for keeping their animals enclosed. If a neighbor's sheep escape and damage your property, the sheep owner is liable whether or not you have a fence.

This distinction matters most for properties on the edges of towns, in unincorporated areas, and near agricultural land. If you're in a suburban Cheyenne subdivision, open range cattle aren't a daily concern. But if you're on a five-acre lot outside Sheridan or near ranch land in any part of the state, understanding the open range doctrine is critical to understanding why you need a fence.

What Makes a Fence "Lawful" in Wyoming?

Wyoming Statute 11-28-102 defines a lawful fence in specific physical terms:

• Steel, concrete, or sound wooden posts (at least 4 inches in diameter) with three spans of barbed wire spaced 10–15 inches apart, posts set at least 20 inches deep and no more than 22 feet apart
• A post-and-board fence with posts no more than 10 feet apart and three 8-inch boards or four 6-inch boards securely fastened
• A four-pole fence with round poles at least 2 inches in diameter, with posts no more than 16 feet apart
• Any other fence made of boards, rails, poles, stones, hedge plants, or other material that's at least as effective as the above

These definitions are primarily relevant for agricultural and open range contexts. A standard residential privacy fence — 6-foot cedar boards on 4x4 posts — easily qualifies as a lawful fence under Wyoming law. But if your property borders open range, it's worth knowing the specific statutory requirements.

How Wyoming Cities Regulate Residential Fences

Within city limits, fences are regulated through local zoning ordinances. The pattern across Wyoming cities is fairly consistent.

Cheyenne

Cheyenne, Wyoming's capital and largest city, requires a fence permit for all new fence construction within city limits. The city's code has several key provisions:

Front yards: Fences in the front non-buildable setback area cannot exceed 48 inches (4 feet) in height.

Side and rear yards: Fences along side and rear interior lot lines, starting at the front building line of the principal structure, are limited to 6 feet from finished grade.

Corner lots: Both yards abutting a street are treated as front yards, meaning the 4-foot limit applies on two sides.

Fences over 6 feet: Any fence exceeding 6 feet requires a building permit in addition to the standard fence permit.

Cheyenne also requires the finished side of the fence to face outward, and every fence must be constructed "in a substantial, workmanlike manner and of substantial material reasonably suited for the purpose." The fence must be entirely on the owner's property unless the adjoining owner agrees in writing to place it on the property line.

Casper and Natrona County

Casper and Natrona County each have their own fence rules. In unincorporated Natrona County, fences up to 7 feet do not require a building permit, but a zoning certificate is still required. All fences must comply with the county's zoning resolution, which covers height, setbacks, and materials.

Casper's city zoning specifies height limits and placement rules for front, side, and rear yards. Front-yard fences typically require greater setbacks than backyard fences. Homeowner associations in Casper's newer subdivisions may impose additional restrictions on materials, styles, and colors.

Evanston and Smaller Cities

Evanston caps fence height at 6 feet across the board — no fence, hedge, wall, or obstruction can exceed that height unless it's part of a planned unit development. No fence can be placed in a public right-of-way. Evanston also allows conditional use permits for keeping miniature horses in residential zones, requiring the animal area to be enclosed by an approved fence no taller than 6 feet.

Jackson and Teton County have their own considerations — proximity to national forest land, wildlife corridor requirements, and the town's emphasis on design standards all factor into fence decisions. Jackson's regulations should be confirmed directly with the town's building department.

Partition Fence Cost Sharing

Wyoming has one of the strongest partition fence cost-sharing laws in the United States. Under Wyoming Statute 11-28-106:

• The owner of any lawful fence that becomes a partition fence (one that separates their land from a neighbor's) can require the neighbor to pay half the construction cost
• If the neighbor refuses, the fence owner can file a civil lawsuit to recover half the construction cost plus court costs
• Joint users of a partition fence must contribute to maintenance costs in proportion to their respective interests
• If one party refuses to pay their share of maintenance, the other can recover those costs through the same legal process

This law applies automatically to any fence that separates two properties, regardless of whether both owners agreed to build it. It's a powerful tool — and a potential surprise for homeowners who don't realize that their neighbor can build a fence on the property line and then legally demand they pay for half of it.

For subdivisions, there's an additional wrinkle: the subdivider is responsible for constructing a perimeter partition fence on any part of the subdivision adjacent to land where livestock can legally roam. This connects directly to the open range doctrine — new developments bordering ranch land need perimeter fencing, and the developer bears that cost initially.

Material Restrictions

Wyoming cities are consistent on one point: barbed wire and electric fences are prohibited in residential zones. Cheyenne, Casper, Evanston, and virtually every other city ban these materials in residential areas, except when used for containing livestock on agricultural properties. In rural unincorporated areas, barbed wire is the most common fence type and is perfectly legal.

Within cities, common allowed materials include wood, vinyl, chain link, wrought iron, and ornamental steel. Some cities prohibit specific materials:

• Solid concrete or masonry walls over 3 feet may require engineering review in some jurisdictions
• Corrugated metal, plywood, and fiberglass panels may be restricted as fence materials
• Snow fencing is generally allowed only on a temporary basis

The finished side of the fence must face outward toward the neighbor or the street in most Wyoming cities.

Wind: Wyoming's Defining Construction Challenge

Wyoming is one of the windiest states in the country. Cheyenne, Casper, and much of the southern half of the state experience sustained winds of 15–25 mph on a regular basis, with gusts exceeding 60 mph during storm events. This has direct implications for fence construction.

A standard 6-foot solid privacy fence acts as a wind sail, and Wyoming's winds are strong enough to blow poorly built fences over. Best practices for fence construction in Wyoming include:

• Deep post holes — at least 36–42 inches, or deeper in areas with frost depth concerns (Wyoming's frost line ranges from 36 to 48 inches depending on elevation and location)
• Heavy posts — 4x6 or 6x6 posts rather than the standard 4x4
• Tight post spacing — 6 to 8 feet on center, not the 8–10 feet sometimes used in lower-wind states
• Wind gaps — small spaces between fence boards that allow wind to pass through rather than treating the fence as a solid wall
• Concrete footings — setting posts in concrete rather than tamped soil provides significantly more wind resistance

These aren't code requirements — they're practical necessities dictated by Wyoming's climate. A fence that would stand for decades in a sheltered eastern suburb may last only a few years on the windswept prairie around Casper or Rawlins.

Pool Fence Requirements

Wyoming cities that have adopted the IRC follow its swimming pool barrier requirements:

• Pool fences must be at least 4 feet tall and of the non-climbable type
• No external handholds or footholds
• Gates must be self-closing and self-latching
• The gap between the bottom of the fence and the ground must not be large enough for a small child to pass through
• During construction, the pool area must be secured with a portable fence

Some areas offer exemptions from pool fencing requirements on large agricultural lots. Natrona County, for example, exempts pools from the safety fence requirement if the property was not created through a conditional use permit process and the pool maintains a minimum 300-foot setback from rear and side lot lines. This exception applies to large rural parcels, not standard residential lots.

Setbacks, Easements, and Right-of-Way

Across Wyoming cities, fences cannot be placed in the public right-of-way. Most cities allow fences on property lines in side and rear yards, but front-yard fences must typically be within the property's buildable area or at least behind the front setback line.

Easements restrict fence placement statewide. Wyoming properties — especially in newer subdivisions — commonly have utility easements along rear and side lot lines. Building a fence within an easement means the utility company can require you to remove it at your expense to access their infrastructure.

Call 811 before digging. Wyoming requires advance notification to locate buried utilities before any excavation.

For an overview of all building permit requirements in Wyoming — including decks, sheds, and more — see our complete Wyoming building permit guide.

Consequences of Building Without a Permit

In cities that require fence permits, skipping the process carries risks:

• Fines — Wyoming state statute allows fines up to $750 per day for unpermitted construction
• Double permit fees — many cities charge a penalty fee for retroactive permits
• Stop-work orders and removal orders for non-compliant fences
• No future permits — some jurisdictions won't issue permits for other projects on a property with outstanding violations
• Sale complications — title companies and home inspectors may flag unpermitted work during a sale

Given that fence permit fees in Wyoming are modest — Cheyenne's run $35–$150 — the cost of permitting is almost always less than the cost of the consequences.

If you're also planning a deck or retaining wall alongside your fence, each project may have its own permit requirements. Planning ahead and applying for all permits together can streamline the process.