How Castle Rock Handles Landscaping Rules: A Practical Guide

Castle Rock maintains 100 local ordinances across all categories, and 9 of those deal specifically with landscaping rules. Here is a breakdown of what the city actually requires, what is prohibited, and where Castle Rock falls on the strict-to-permissive spectrum compared to other cities.

Grass Height Limits

Castle Rock caps grass and weed height at 12 inches. Properties may not be overgrown, and the Town's Municipal Code (Title 8, Chapter 8.12) makes the property owner responsible for keeping grass and weeds trimmed year-round.

Key details: Max height: 12 inches. Code section: Municipal Code 8.12.030. Applies: Year-round. Responsible party: Property owner. Enforcer: Code Compliance.

Failure to comply with Health and Safety regulations can trigger Code Enforcement action; the Town may abate and bill the property owner.

Weed Ordinances

Castle Rock's Municipal Code limits weed height to 12 inches and, together with the Colorado Noxious Weed Act (CRS 35-5.5), requires property owners to control noxious weeds on their land. Owners manage weeds by mowing, spraying, pulling, or native landscaping.

Key details: Height limit: 12 inches. State law: CO Noxious Weed Act, CRS 35-5.5. Town code: Municipal Code 8.12. Owner duty: Control noxious weeds. Methods: Mow, spray, pull, natives.

Non-compliance can result in Code Enforcement action; the Town may abate weeds and bill the owner. Noxious-weed neglect is enforceable under state law.

Tree Removal & Heritage Trees

In most cases the Town of Castle Rock does not require a permit to remove a tree on your own private residential property. Trees in the public right-of-way are a different matter and cannot be removed without Town or County permission.

Key details: Private-property permit: Generally not required. Right-of-way trees: Permission required. HOA rules: May restrict removal. County ROW policy: Written permission only. Contact: Town forestry / Code Compliance.

Removing a right-of-way tree without permission can prompt Town/County enforcement and replacement or restitution costs; HOA rules carry separate penalties.

Rainwater Harvesting

Colorado law lets Castle Rock residents collect rooftop rainwater in up to two rain barrels holding a combined 110 gallons, with no permit required. Barrels are allowed at single-family homes and multi-family buildings of four or fewer units.

Key details: Max capacity: 110 gallons combined. Barrels allowed: Two. Permit: None required. Eligible homes: 1–4 residential units. Statute: CRS 37-96.5-103.

Exceeding 110 gallons total, using barrels for indoor/potable use, or collecting off non-residential roofs falls outside the statutory exemption and violates Colorado water law.

Tree Trimming

Castle Rock requires all plants and trees be trimmed so they do not impair driver vision or obstruct travel on sidewalks or roadways. Property owners must keep vegetation clear of the public right-of-way and sight lines.

Key details: Rule: No blocking sight or travel. Covers: Sidewalks, roadways, driver vision. Private-yard permit: Not required. Enforcer: Code Compliance. Right-of-way trees: Coordinate with Town.

Code Compliance issues notices to correct obstructing vegetation; unresolved violations can lead to enforcement action and Town abatement.

Water Restrictions

Castle Rock Water restricts residential lawn irrigation to every third day, before 8 a.m. or after 8 p.m., from May 1 through Sept. 30. Your watering days come from a square, circle, or diamond symbol set by the last digit of your address.

Key details: Frequency: Every third day. No watering: Between 8 a.m. and 8 p.m.. Season: May 1 – Sept. 30. Day assignment: Last digit of address symbol. Hand watering: Any time, no waste.

First violation is a warning; subsequent violations incur a fee applied to the water bill. Water waste alone can trigger a watering violation.

Artificial Turf

Colorado's 2024 turf law (SB24-005, amended by HB25-1113) bans nonfunctional and nonfunctional artificial turf on new nonresidential and common-interest projects starting Jan. 1, 2026. It does not restrict artificial turf on existing or new single-family residential lots.

Key details: State law: SB24-005, HB25-1113. Effective: Jan. 1, 2026. Restricts: Nonresidential, common-interest turf. Single-family homes: Not restricted. Check: HOA covenants.

Nonfunctional turf installed on covered nonresidential/common-interest projects after Jan. 1, 2026 violates local ordinances adopted under SB24-005; residential lots are generally exempt.

Native Plants

Colorado law protects a homeowner's right to install water-wise and native landscaping. Under SB23-178, HOAs cannot ban drought-tolerant xeriscape or native plants, and Castle Rock Water actively encourages low-water native landscaping.

Key details: HOA rule: Cannot ban xeriscape (SB23-178). Native plants required?: No — encouraged. Promoted by: Castle Rock Water. Still must: Control weeds, trim growth. Benefit: Lower water use, rebates.

No penalty for choosing native plants; an HOA that unlawfully bans water-wise landscaping violates SB23-178. Overgrown or noxious plants remain enforceable under Town code.

Composting

Backyard composting is allowed in Castle Rock with no Town permit; residents just avoid meat, dairy, and oily foods that attract pests. Yard waste can go to the free Douglas County Slash-Mulch Program, seasonal Town collection events, or a private curbside compost service.

Key details: Backyard permit: Not required. Avoid: Meat, dairy, oily foods. Free option: County Slash-Mulch Program. Town service: Seasonal collection events. Nuisance limit: No odor, pests, blight.

A neglected compost pile that causes odor, pests, or blight can be cited as a nuisance under the Town's Health and Safety code; no fine for tidy backyard composting.

The Bottom Line

Castle Rock's landscaping rules rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Castle Rock is broadly strict or permissive.

These rules come from Castle Rock's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.