The homer on Monday night was Arenado's fifth of his career.
ST. LOUIS, MO - JULY 30: Nolan Arenado #28 of the Colorado Rockies hits a grand slam against the St. Louis Cardinals in the fifth inning at Busch Stadium on July 30, 2018 in St. Louis, Missouri. (Photo by Dilip Vishwanat/Getty Images)
His last grand slam was on Sept. 21, 2016 and it was also against St. Louis.
#Rockies Nolan Arenado with his fifth career grand slam in the fifth inning, his first since Sept. 21, 2016 vs. St. Louis and his first ever on the road. It is the first grand slam ever hit by a Rockies player in St. Louis.
— Rockies Club Information (@RockiesClubInfo) July 31, 2018
All of Arenado's other grand slams have been at home.
SCOTTSDALE, AZ - FEBRUARY 22: Nolan Arenado #28 of the Colorado Rockies poses on photo day during MLB Spring Training at Salt River Fields at Talking Stick on February 22, 2018 in Scottsdale, Arizona. (Photo by Patrick Smith/Getty Images)