Skip to main content
CityRuleLookup

Montana Statewide Rule

Montana County Noxious Weed Control Act Requirements

Heavy RestrictionsApplies statewide across Montana (2026)

Key Facts

Statute
MCA Title 7, Ch. 22, Pt. 21
Enforcement
County weed districts
Cost recovery
Assessed as tax lien
List authority
MT Dept. of Agriculture
Last verified: August 21, 2026Source: Montana Legislature

Summary

Montana's County Noxious Weed Control Act requires every landowner to manage state-listed noxious weeds on their property. County weed districts have statutory authority to inspect, notify, and force compliance, with costs assessed against the landowner.

(1) It is unlawful for any person to permit any noxious weed to propagate or go to seed on the person's land, except that any person who adheres to the noxious weed management program of the person's weed management district or who has entered into and is in compliance with a noxious weed management agreement is considered to be in compliance with this section.

Source: Montana LegislatureView official code

Full Breakdown

Under Title 7, Chapter 22, Part 21 of the Montana Code Annotated, every county has a weed district that enforces the state noxious weed list. Landowners must control or eradicate listed species like leafy spurge, knapweed, and Canada thistle. County weed coordinators may enter property after notice to inspect and, if owners fail to act, contract for control work and assess costs as a tax lien. The Montana Department of Agriculture maintains the official list and provides cost-share funding. This statute applies uniformly across cities and unincorporated areas.

Violations & Penalties

Failure to control noxious weeds after notice allows the county to perform work and assess costs as a property lien collected with taxes.

Frequently Asked Questions

Who decides what counts as a noxious weed in Montana?
The Montana Department of Agriculture maintains the statewide noxious weed list. Counties may add locally regulated species but cannot remove state-listed species.
Can the county enter my land to inspect for weeds?
Yes. After providing written notice, county weed coordinators have statutory authority to enter and inspect property for noxious weed compliance under MCA 7-22-2116.

Sources

See something wrong?

Help us keep this page accurate. If you notice an error or outdated information, let us know.