I've been on T now for a little over 10 weeks.  I'm getting in a little mustache and fairly long (about 1.5 to 2 cm) chin hairs as well as some hair on my stomach.  The only thing is they're all blond (the stomach ones are a little darker).  The hair on my head is a light brown but used to be "dirty" blond.

I don't know my family history except for my dad's side which I don't take after hair-wise, so I can't predict what things will turn out like.

Any advice from other blond guys on T out there?  I was looking at that Just for Men facial hair dye stuff.  Would it work on non-gray hairs do you think?  I just want to make the hair I've got more prominent, not create a fake stubble appearance.  I don't mind waiting longer and seeing what happens.  But if the hair stays blond, I just want to know what my options are.

Facial hair can start out light when it's developing. I had that on my chin where I had a few dark hairs and then a bunch of light hairs. As I started shaving the lighter hairs started to grow back darker.

Hmm okay.  I haven't shaved my chin or upper lip since I started T.  I have spring break coming up so I'll do that then and see what happens.

I have blond facial hair at >1 year on T...  I just shave it off.  My face is definitely rough and stubbly when shaved, but because the hair is so light, it doesn't look like I even have stubble.  Maybe some day it'll grow in dark. 

If you want to hurry it up, though, I've heard some guys have had luck with the Just for Men facial hair dye that you mentioned.  I don't see why it wouldn't work on non-gray hairs.  The dye doesn't know or care what color the hair is.  As long as the dye is darker than the hair it is coloring, it should work fine.

Sorry if I'm butting in the wrong forum but I used to have blond facial hair. My redundant guess is to just give it time. If you have blond eyebrows etc...then more than likely it will slowly get darker over time...but it could take years. Little bits of this or that color will come through and it will still probably have to be fairly long before being easily visible (which was awesome for me   ). If your eyebrows and other body hair is darker (which alot of blondes have) It probably won't be too too long for you to wait for it to be darker.

I am still working on ridding myself of my formerly blond beard.
It took many years but it did darken, about in my mid 30's. Mostly to a dark blond with some black. Now its mostly gray. lol

I'm blonde and almost 1 month on T. I've had decent facial hair growth so far.

My sideburns are coming in thick and they're the same colour as the head on my hair, I'd hope they would be anyway. My mustache isn't coming in nearly as thick, and I have some hairs along my jawline and my chin, but they're just a bit lighter.

That said your facial hair could grow in in a colour that is no the same as the colour on your head. Red is common(I actually expect some of my hair to be reddish because I'm reddish blonde) and blonde is not out of the question if you've had dirty blonde hair in the past.

Howdy, I'm just over 6 months on T and also mousy brown, and my arm and leg hair is almost translucent. I have an abundance of very soft blond facial hair and also a full moustache, but SOOOO blonde and soft you cant see it. But weirdly, my leg hair and treasure trail hair is starting to come in... Black. WTF? So yeah its a conundrum! I'd love a manly stubbly face but all i can muster up is fluff. lol. Not much help, i know. 

Just for Men works wonders. The facial hair I get in is part my hair color, part clearish...so I just dye it.

Thanks everyone. I think I'm going to wait a little longer for some more growth and see if it gets darker or not (my eyebrows and body hair are dark) before I use the Just for Men.