Welcome to Blackjack Oaks Ranch. We are a small Santa Gertrudis cattle ranch in Washington County, Texas. Check out our Photo Gallery to see some of the Blackjack Oaks Ranch Cows, Bulls and Calves that currently call Blackjack Oaks Ranch their home. Then be sure to check out our Santa Gertrudis Cattle Sales page for cattle currently for sale. We are here to promote the Santa Gertrudis breed of cattle. All questions are welcome!