In my personal opinion, in the fall it is easier to attract hummingbirds than in the spring. This post will explain why I believe this to be true.
In the fall hummingbirds will be searching for their winter feeding territory. As a result, hummingbirds are much more likely to linger at a good feeding spot and may remain there for between one to two weeks.
You will want to be sure and continue to provide food for the hummingbirds until the late fall. This will provide migrating hummingbirds food on which to feed along their long migratory journey. My best advice is that you leave your hummingbird feeders up for at least two weeks after you have seen your last hummingbird. This will ensure that that there is an available food source for any vagrant hummingbirds that still remain in the area after the other hummingbirds have left the area.
Please do not worry that leaving your feeders up in the fall will prevent the hummingbirds from migrating because this is simply not true. What will determine when migration occurs is a change in the length of the day or what is known as photoperiod.
Let me state the obvious, yes it is possible to attract hummingbirds in the spring also. People do it all the time and you should continue to try to do so as well, but this post is simply to explain why I think attracting hummingbirds is easier in the fall. Your personal opinion on this subject may also be affected by where it is that you live. Feel free to let me know how you feel concerning this matter.