This is new for me this year, but since I am planting a hummingbird/butterfly garden, I'd better have a hummingbird feeder too! According to my Mom, the bird expert, it's time to put the feeders out now as the hummingbirds will be migrating through Calgary soon. Apparently once they find one, they'll return to the same spot year after year.
Feeders can be filled with a 4:1 water:sugar solution (eg. 2 cups water, 1/2 cup sugar). Keep them clean and full.
PS (as of May 16, my Mom has had 1 hummer at her feeder!)
For more helpful tips, click on "comments" below for information from Zoe Anne Hinds at http://www.hummingbirdsformom.com.