Jefferson County, CO Landscaping Rules: Weed Ordinances (2026)
Key Facts
- Governing law
- Colorado Noxious Weed Act, CRS 35-5.5
- Landowner duty
- Manage neighbor-damaging noxious weeds
- List A weeds
- Eradicate countywide
- Max civil penalty
- $1,000 per violation
- County program
- Jeffco Invasive Species Management
Summary
Every landowner in unincorporated Jefferson County has a legal duty to manage noxious weeds. State law (CRS 35-5.5-104): 'It is the duty of all persons to use integrated methods to manage noxious weeds if the same are likely to be materially damaging to the land of neighboring landowners.'
It is the duty of all persons to use integrated methods to manage noxious weeds if the same are likely to be materially damaging to the land of neighboring landowners.
Full Breakdown
Jefferson County administers a Noxious Weed Management Plan for unincorporated land under the Colorado Noxious Weed Act (CRS 35-5.5), through Jeffco Invasive Species Management. List A noxious weeds must be eradicated countywide; List B weeds must be eradicated, contained, or suppressed based on location; List C control is recommended. Free grant-funded eradication of certain designated weeds is offered to unincorporated landowners. The county may inspect (after certified-mail notice) when a landowner requests it, a neighbor reports an infestation, or an agent observes one from a right-of-way, and may declare infested premises a public nuisance for abatement.
Violations & Fines
Civil penalty up to $1,000 per violation, doubled for repeat violations, after notice and hearing (CRS 35-5.5-118); premises may be declared a public nuisance and abated at owner cost.
Frequently Asked Questions
Am I legally required to control weeds on my land?
Will the county help me remove them?
Sources & Official References
Other rules in Jefferson County
How Jefferson County compares: Cities with the Strictest Weed and Property Maintenance Rules·Compare Jefferson County to another location·View the Colorado landscaping rules overview
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