Landscaping Rules in Adams County, CO (2026)

2 county-level rules, plus city-specific rules for 2 cities in Adams County, Colorado.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Adams County. If you live within an incorporated city, that city's own rules apply: see the city list below.

Weed Ordinances

Adams County sets weed height under two instruments. Section 302.4 of the Property Maintenance Code, as amended by Ordinance No. 12, requires premises and exterior property to be free from weeds or plant growth in excess of 6 inches and prohibits noxious weeds. Development Standards section 4-20-01 requires weeds greater than twelve inches in height to be cut to six inches or less in the areas it lists by zone district.

Adams County Weed Height Rules: Sections 302.4 and 4-20-01

Some Restrictions

Adams County Property Maintenance Code § 302.4 (Ord. No. 12); Adams County Development Standards and Regulations § 4-20-01 (2)(3)

302.4 Weeds. Premises and exterior property shall be maintained free from weeds or plant growth in excess of 6 inches ... Noxious weeds shall be prohibited. ... 4-20-01 (2)(3) Duty to Control Weeds/Maximum Height of Weeds: It is the duty of every owner or occupant to abate weeds and offending vegetation on all premises. Weeds and offending vegetation greater than twelve (12) inches in height, o...

Full ordinance details →Official source ↗

Water Restrictions

There is no single county watering rule; limits are set by your water provider. In the South Adams County Water and Sanitation District (Commerce City and vicinity), irrigation is barred between 10 a.m. and 6 p.m., with assigned days based on your address. Denver Water customers face separate drought-stage rules.

Outdoor Watering Restrictions in Adams County

Some Restrictions

South Adams County Water & Sanitation District — Irrigation Rules

Irrigation shall not occur between the hours of 10 a.m. and 6 p.m. Watering days based on even/odd last number of street address.

Full ordinance details →Official source ↗

Landscaping Rules by City in Adams County

2 cities in Adams County have their own landscaping rules rules. Each link goes to that city's dedicated page with code citations.

ThorntonPop. 141,867

5 verified rules • Native Plants, Tree Removal & Heritage Trees

WestminsterPop. 116,317

6 verified rules • Artificial Turf, Native Plants

All Adams County ordinances

See every category we cover for Adams County: parking, noise, fences, fires, animals, pools, and more.

Adams County Ordinance Hub →