only starting myself but you will have to wait till the pistals turn brown the white hairs on the buds, but looking very good indeed, can i ask what kind? im trying super skunk as grows well in the uk out doorsyou can see the white hairs on this bud,i think a better guess would be how long it has been flowering for as it seems to only be around week 2 at most so you have a LONG time no matter how you slice it. about how long until frost hits?