Twin Falls County, ID Landscaping Rules: Tree Trimming (2026)

Title 2, Chapter 3, § 2-3-7, titled 'Tree Care, Easements and Line Clearance,' has the Twin Falls County tree board promote area-appropriate International Society of Arboriculture ANSI A300 tree care practices as its general benchmark. The same sentence immediately subordinates that benchmark: the ANSI A300 practices apply 'unless such practices are superseded by the needs of the highway districts or Idaho Power Company,' meaning the county tree board's own standard yields whenever a highway district or the power utility asserts a conflicting need along its easement.

The section then hands off the two specific measurements a trimming rule would normally set: standards for tree selection and planting distance off road easements refer to the applicable area highway district's own regulations and literature, and standards for minimum line clearance on overhead power lines refer to Idaho Power Company's own policy and literature, not to any distance printed in the County Code. Section 2-3-6 ties county parks and other county property to that same ANSI A300 benchmark referenced in § 2-3-7. The practical effect for someone in unincorporated Twin Falls County is that a tree branch overhanging a county road or a power line is not measured against a county-set clearance figure; the highway district or Idaho Power's own published standards control, with the tree board's role limited to education and coordination rather than enforcement.