Southern Pea (warm-season vegetable) is classed tender in the cited extension guidance. The timing rules below are relative to your local freeze dates — enter a location to turn them into calendar dates.
The rules this site applies
Method
Frost-relative window
Rule & reconciliation
Direct-sow outdoors
from the median last spring freeze to 2 weeks after
Maryland Extension says to wait until all danger of frost is passed, Alabama Extension says to plant after any danger of frost has passed, and Texas A&M's crop guide lists the optimum time as soil above 65°F with danger of frost over; all three agree on the last-frost date, so the point rule opens the window at the anchor and runs 14 days.
Fall planting
75–65 days before the median first fall freeze
Arkansas Extension gives an explicit frost-anchored fall range — plant about 65 to 75 days prior to the average frost date — which encodes directly as 75 to 65 days before the first fall freeze; it is the only source in this set that states fall timing relative to frost rather than by calendar month.
Variety assumption: Assumes a standard 60–70 day bush or semi-vining southern pea; the fall window is Arkansas' allowance for the crop to set and fill pods before the first freeze.