There have been some polls of "Spitz=? season" going on in some of the fans' homepages.

To me, Spitz definitely belongs to Spring (Haru). (Spitz=Spring)

This conclusion is not based on my "analysis", or any evdiences found, but merely my feelings. There are a lot of songs that can represent Spring. ("Zumetai hoho", "Hachime no hana", "Tada haru wo matsu", "Cherry"...)

The feeling could be due to their albums' covers.  The covers such as "Orora ni narenakatta hito no tame ni", "Hoshi no kakera" and "Hachimitsu" give me very strong sprit of "Haru". Moreover, even though some their songs are not directly related to spring at all, the lyrics often remind me of spring. ("Koi wa yuugure", "Usagi no bike", "Aoi kuruma", "Pool", "Sakana")

In fact, there are also a number of songs that can represent fall too. (^^;) The best example is "Kaede". Also, the special album "Ka Cho Fuu Getsu" has a very strong image of fall too. Plenty of songs about summer can also be found. ("Natsu no mamono", "Grasshopper", "Yuhi ga warau, kimi mo warau", "Naka yoshi")

I think most of the fans believe Spitz represents fall. This definitely makes sense, particularly when you see Kusano san often wearing quite a bit on stage. (^^;)  However, fall often gives me a feeling of sadness, and , in my opinion, their songs are just too sweet to relate to fall.