Southwest is usually around 10 months. If you go to the website, they sometimes have information on the next time they will release fares.
JetBlue is usually a little sooner, maybe a few weeks. I have through April 2015 available now when I check flights. I would say by October 1st is likely.
I've been watching South West for January 2015 and they were released one day at a time at 6 months it seemed. Since they've been released for our dates they've only gone up! Boo, waiting for them to (hopefully) go back down if not on sale!