Can African Marigold be planted in Oct-Nov, mid zone 6 to upper zone 7.

Question

They would be started from seed.

Answer 1

They are best planted in spring, either started indoors before the last frost date or started in the ground after the last frost.

Growing them now would only kill them with the first hard freeze.

Here is more:
http://www.gardening.cornell.edu/homegardening/scene415d.html
https://www.gardeningknowhow.com/ornamental/flowers/marigold/how-to-grow-african-marigolds.htm