Costco Gas Prices in Grafton, Wisconsin
Grafton · Warehouse #628
950 PORT WASHINGTON RD, Grafton, Wisconsin 53024-9201
Prices updated: July 22, 2026 at 6:00 PM
Regular
$3.699
PRICE PER GALLON
Press
Premium
$4.759
PRICE PER GALLON
Press
Current gas prices at Costco #628
This Costco gas station is located at 950 PORT WASHINGTON RD in Grafton, Wisconsin. The latest reported fuel prices are regular at $3.699/gal, premium at $4.759/gal. Prices were last updated on July 22, 2026 at 6:00 PM.
Get directions to this Costco gas station30-Day Price History
30-day change
Regular
$3.699no change
Premium
$4.759−0.120 (2.5%)
DateRegPrem
Jul 22, 6:00 PM$3.699$4.759
Jul 20, 3:00 PM$3.699$4.799
Jul 18, 4:00 PM$3.599$4.739
Jul 17, 4:00 PM$3.599$4.699
Jul 16, 3:00 PM$3.599$4.769
Jul 15, 3:00 PM$3.599$4.699
Jul 15, 2:00 AM—$4.699
Jul 15, 1:00 AM$3.599$4.699
Jul 11, 5:00 PM$3.539$4.539
Jul 10, 12:00 PM—$4.539
Jul 10, 11:00 AM$3.539$4.539
Jul 9, 5:00 PM$3.589$4.589
Jul 9, 12:00 PM—$4.589
Jul 9, 11:00 AM$3.589$4.589
Jul 5, 5:00 PM$3.599$4.639
Jul 3, 4:00 PM$3.639$4.639
Jul 2, 3:00 PM$3.689$4.689
Jul 1, 3:00 PM$3.699$4.739
Jun 30, 2:00 PM$3.699$4.759
Jun 26, 2:00 PM$3.699$4.849
Jun 25, 3:00 AM—$4.849
Jun 25, 2:00 AM$3.699$4.849
Jun 24, 3:00 PM$3.699$4.859
Jun 23, 3:00 PM$3.699$4.879