Thornton, CO Fence Regulations: Material Restrictions (2026)
Summary
Thornton regulates fence materials by zone. Wood, vinyl, wrought iron, and chain-link common. HOAs frequently impose stricter material requirements.
As used in this article, unless the context otherwise requires: (1) "Lawful fence" is a well-constructed three barbed wire fence with substantial posts set at a distance of approximately twenty feet apart, and sufficient to turn ordinary horses and cattle, with all gates equally as good as the fence, or any other fence of like efficiency. Railroad right-of-way fences constructed in compliance with the statute in force on the date of construction and maintained in good condition shall be considered legal fences. (2) "Livestock" includes horses, cattle, mules, asses, goats, sheep, swine, buffalo, and cattalo, but does not include "alternative livestock" as defined in section 35-41.5-102 (1).
Official source re-checked September 7, 2026: the cited page had not changed since it was quoted.
Full Breakdown
Thornton zoning code specifies approved fence materials. Residential zones allow wood, vinyl, chain-link, wrought iron, and tubular steel. Chain-link may be restricted in front yards. Barbed wire prohibited in residential zones. Electric fences restricted to agricultural areas. HOAs in Colorado frequently require specific materials (cedar, composite, wrought iron) and prohibit chain-link. Fence “good side” (finished side) typically faces outward toward neighbors.
Frequently Asked Questions
Can I use chain-link?
Which side faces out?
Sources & Official References
Other rules in Thornton
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Material Restrictions in Nearby Cities
How other cities in Adams County handle material restrictions.