My house is weathered cypress wood. My roof is a grayish-brown slate. What color would you paint the garage door?
What color is your trim, gutters and windows? Also, a picture would be helpful. I would use a color that compliments the roof and wood. A light color or white would stand out too much, in my opinion. You could use a similar color as your gutters and windows, this would provide continuity to the color scheme. Another option is a matching grayish/brown as your roof?