yeah but its a bit of a pain to have to go and check to see if you can buy pumpkin seeds from the vendor, not knowing if the season has started yet. Wish we could get some staff input on this.
You can just pack a pumpkin with you (they're on the AH frequently if you don't have one) and if you can carve it, badges are counting. There was a thread last Zilloween where someone knew the exact lead time but I couldn't find it.
Well, I'm not making any promises that this won't change in the future, but currently the Zilloween season runs from the 25th through the 37th of the month of Remember.
(For those not aware of this, you can see the in-game calendar by clicking the date at the top right of your screen and then clicking on calendar.)
Considering they plan to add stuff in for the other holidays, that might start to get a bit irritating after awhile. Worth trying though.
What I'd really like is to be able to click Zilloween or hover my mouse over it in the calendar and see the game dates it runs for. That would be nice.