Is it too late to fertilize my raspberries for next year's harvest?

I've got floricane raspberries, and the canes for next year seem very small and underdeveloped compared to the ones I just harvested this years berries off of. Is it normal that they be so small at this point? Or should I have fertilized them better weeks ago, and is it too late now? This was my first harvesting year, so I'm not sure what's normal at this point.