As of 2025/2026, urban heat island mitigation measures are addressed through the California Green Building Code and County design guidelines.
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Yolo County General Plan - Land Use and Community Character Element: Policy CC-4.8 requires development standards that reduce urban heat island effects, including reflective and light-colored roofing and pavement, green roofs, shade trees in parking lots, and other heat-mitigation design measures.
Policy CC-4.8 Require measures to minimize “heat islands” by requiring light-colored and reflective roofing materials and paint; “green” roofs; light colored roads and parking lots; extensive numbers of shade trees in parking lots; and shade trees and/or overhangs on the south and west sides of new or renovated buildings.