By our calculations, you should look at sowing Cherokee Trail of Tears about 14 days after your last frost date.
This bean originated from the native North American Cherokee people, who carried the beans with them during the “Trail of Tears” forced march the Cherokee people made whilst being driven out of their homelands by the US Government in 1838. 1 The species name vulgaris is from the Latin vulgus (“the multitude, the masses”) + -āris, and means “common”, “usual”, or “commonly known” 2.
1 http://www.realseeds.co.uk/beans.html