I've planted them in October and maybe Feb/March before... They really won't last through the heat for me and I always replant where they were with something else, so not sure if they come back or not - lol... You can always grow some in a pot on a sunny windowsill if you want them year round and you have the perfect windowsill. They grow well like that!
Oh, and the seeds take a long time to sprout sometimes. More than once I've planted them and then planted something else there because there was nothing growing there. Then lo and behold I have chives growing in the bean patch!
