Mine have yet to pop up, but I think they're just holding back, ready to release that pent-up energy in a huge burst. Make way for an epic harvest!
I still have 7.5 lb of 2014 hops in my freezer - quite a fine selection of organic homegrowns. I've often thought that I could lose a whole season's worth and still be just fine. Gotta love the bounty of a good hopyard.