The harvest moon is the first full moon after the first frost.
Have we had frost in Calgary yet?
I enjoyed the Fall spectacle riding home on my bike. September is my favourite month.
Wikipedia – Harvest Moon
The harvest moon is the first full moon after the first frost.
Have we had frost in Calgary yet?
I enjoyed the Fall spectacle riding home on my bike. September is my favourite month.
Wikipedia – Harvest Moon
Rick McCharles 
http://calgarygardencoach.typepad.com/calgarygardencoach/2008/09/first-frost.html
not official, but good enough for me: Indian Summer.