I think the length of the day makes a difference when the hops burr out and the cones ripen. In Wisconsin I picked my hops late in August last year (the 25th?).
To uechikid: Do the cones really get bigger if the plant flowers sooner? If you've got 1" cones now those will be some big juicy ones this fall. I'm getting real thirsty now :-)
Natural 20 Brewery
Yes, that *is* beer. Water, malt, hops, and yeast mean it's beer. Go ahead and try a glass...