I'm planning a trip to Cotswolds, UK, and am curious when about the colors usually start to change?? I'm not asking about when peak colors usually are; I want to know about when the colors first start to change. I ask because I'm looking to avoid any color! I was thinking about coming from mid August to mid September (I unfortunately can't come earlier than that), and wanted to get all of the summer green without any color change.
Thanks very much!