Still have about 30 cats on my milkweeds

[califspaw]

I wonder if these cats will still head out to Mexico the majority are in 4th & 5th instar but there are 7 or so in 1st in star. I am in Southern Ca.

[Mona Miller]

The CA Monarchs head up the coast mostly. You might be able to get tags from Monarch Alert to tag them before they leave.

http://monarchalert.calpoly.edu/index.html
Monarch Alert

Or, some may even stick around.

[Paul Cherubini]

When the adults emerge in mid-late November they will not have much of a migratory instinct and so will tend to stay in your general area. They will also be weak diapausers so some should end up mating and laying eggs.