Test house paint colors on cedar shake siding by applying large swatches, about twenty-four by twenty-four inches, directly on the shingles. Observe these samples multiple times a day—in morning, afternoon, and evening light—to see how colors shift under various natural light conditions. This process helps accurately assess undertones, contrast, and overall appearance before committing. Testing in your home's actual climate prevents surprises and ensures your chosen colors look vibrant year-round.