Determining sex

At what point after germination do plants begin telling whether they're female or not? Started a dozen seeds in mid April (4 each of Northernberry, Skunkberry and C99) and so far everybody's looking real spikey and female. They're in soilless containers outdoors. The tallest Skunk has reached 54 inches and it looks like they've stopped growing. I've been using a small magnifying glass searching for signs of maleness and so far just not seeing any. Could they ALL be females?!

Depending whether you veg, and for how long gets added into the time, but if you started them outdoors, if you really are in VT., you probably will have to wait up to another month before you see signs because you still have long days.
I put 3 plants outside over a month ago, 2 of them vegged for 60 days, and both started flowering, but shortly after that, one of them started revegging due to long hours.(alomst 15)

Barring abnormal weather, I doubt you'll see preflowers in N. Vermont in mid July.

Bro I started my plants outdoors in may and they still haven't shown their sex either, I'm thinking next month they will show their sex, I'm In so cal.....don't worry man be patient they will show themselves soon enough....

Thanks, you guys. Although carsick is the only one to actually say "be patient", that's what all of you are telling me, and you're right of course. Just measured that Skunk again and now it's 56 inches, so they haven't finished vegging (sp?) after all. They all look great though. Got the seeds from the real Peak Seeds (peakseedsbc.com) so I shouldn't be worried. The reason for my 'high anxiety' is that I screwed up royally last year and this is the first time I've run out of smoke before the next crop arrives. Now I'm studying these forums and actually keeping a journal so it won't happen again. Thank you all for your advice.

Except for one exception I plant 3rd week in May and like clockwork by mid August they are sexing and usually harvest early October, I live in Pa. USA, Happy Gardening.

Next year, start your seeds on 12/12...after 3 weeks or so they will show sex.....keep the bitches, kill the boys.....put the girls back into veg......thank me later.