How Castle Rock Handles Landscaping Rules: A Practical Guide

Castle Rock maintains 52 local ordinances across all categories, and 4 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.

Weed Ordinances

Castle Rock caps weed and grass height at 12 inches. Under Municipal Code 8.12.030, properties may not be overgrown with grass or weeds exceeding 12 inches at any time during the year. Owners must also control state-listed noxious weeds under the Colorado Noxious Weed Act.

Key details: Maximum height: 12 inches, year-round. Code section: MC 8.12.030. Noxious weeds: CRS 35-5.5 also applies. Purpose: Fire prevention. Abatement: Hand trimming or mowing.

The Town sends reminder letters to owners in violation; continued non-compliance results in Code Enforcement action and possible Town abatement at the owner's expense.

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.

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.