I winterize my car in preparation for the harsh winter. I want to say I summerize my snow blower for summer storage. But "summerize" seems not to be an English word, and in any case, it is homophonous with summarize.
My google dictionary led here:
S: (v) summerize, summerise (prepare for summer) "summerize your car"; "summerize a house"
So I wouldn't throw summerize out the window yet.