There is a small western population that winters on the west coast (California) somewhere. Here's a link about the migration routes...but they aren't very specific about where they overwinter or how far north they end up during summer: http://www.fs.fed.us/monarchbutterfl...on/index.shtml
And I only knew about the patches cuz I went to the local nature reserve's kiddy show at their Butterfly House.
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."