What time is best to dye your hair for fall?!

I love love love love love fall! Here’s my thing, I moved a year and a half ago and went super blonde, my license etc says blonde, but it took a toll on my hair I’m a natural dark brown haired girl so I went back to my roots and it looks great but fades out because the bleach is underneath. No biggie, it looks like natural highlights honestly and was awesome for summer! But I want to go back to my super dark roots (aka black hair) but don’t want to rush it as my license etc says blonde and I’m going to a football game next weekend. When is your go to time for fall hair?!