Just FYI from
www.whatscookingamerica.net:
"The term "summer" and "winter" for squash are only based on current usage, not on actuality. "Summer" types are on the market all winter; and "winter" types are on the markets in the late summer and fall, as well as winter. Thus, the terms "summer" and "winter" are deceptive and confusing. This terminology was never meant to confuse— it just dates back to a time when the seasons were more crucial to man's survival than they are now. "Good keepers" became known as winter vegetables if they would "keep" until December. "
So I guess it really shouldn't matter!!