The Short Answer
Montana has no state law requiring a survey before building a fence. You are not legally obligated to hire a surveyor first. But in Montana's ranch country, where property lines cross miles of open terrain and the stakes of a misplaced fence are high, skipping the survey is a decision that deserves careful thought.
Why Montana Fence Placement Is Riskier Than It Looks
Unmarked and Missing PLSS Corners
In urban Montana, subdivision lots are platted with corners that are relatively easy to find or have been recently set. In rural Montana, the situation is very different. Property corners in ranch country tie back to original General Land Office section corner monuments set in the 19th century. Many of those monuments are in remote terrain, buried, damaged, or missing. Without a current survey, the rancher or property owner building a fence has no legally reliable way to know where the boundary sits.
Scale of the Problem
A fence encroachment of one foot on a suburban lot may affect a small strip of grass. A fence encroachment of one foot across five miles of ranch fence involves a strip of land hundreds of acres in total area. In Montana, where grazing allotments, water rights, and federal range permits are tied to the land base, the consequences of a misplaced fence can extend well beyond the fence itself.
Water Rights Access
Montana's prior appropriation water system means that irrigation ditch easements and stock water access routes may cross property boundaries. A fence placed across an existing easement can block legal access to water rights held by neighboring landowners. This creates not just a trespass issue but potentially a water law dispute, which in Montana can involve the state water court.
Montana's Line Fence Law
Montana Code Annotated Title 70, Chapter 16 governs line fences between adjacent landowners. Montana's line fence statute allows neighboring landowners to share responsibility for maintaining division fences along their common boundary. When a dispute arises over fence location, maintenance responsibility, or cost, the statute provides procedures for resolution. However, resolving these disputes efficiently requires knowing where the actual boundary is, which means a survey.
Montana's agricultural communities have a long tradition of fencing along assumed property lines without formal surveys. When those assumptions are wrong and a dispute arises, the resolution almost always requires hiring a surveyor after the fact, at greater cost and with the complication of an already-built fence in the wrong location.
Local Zoning and Fence Permits in Montana
Montana's cities and towns regulate fence height and placement through local ordinances. Billings, Missoula, Bozeman, and other municipalities have zoning codes that specify maximum fence heights by zone, setback requirements, and permit thresholds for certain fence types. Check with your local planning or zoning office before building in an incorporated area.
In unincorporated rural Montana, formal fence permits are rarely required. The governing constraint is property law, not local ordinance, which is why knowing exactly where the property line is before building matters more, not less, in rural settings.
What a Survey Gives You Before You Build
- A legally certified determination of where the boundary sits
- Physical monuments or stakes showing the exact fence line
- Documentation you can reference if a dispute arises years later
- Confidence that your fence does not encroach on grazing allotments, water access routes, or adjacent ownership
Many Montana surveyors will stake a proposed fence line as part of the survey engagement, placing temporary markers along the boundary so the fence crew can follow the certified line. Ask whether this service is included when you request quotes.
The Bottom Line for Montana Property Owners
The larger the parcel and the more isolated the location, the stronger the case for surveying before you fence. A survey in rural Montana can prevent decades of neighbor disputes over a fence line that never matched the legal boundary. Every surveyor in our Montana directory is sourced from state licensing records. Browse the Montana directory by county to find a licensed PLS near your property.