Costco Gas Prices in Grafton, Wisconsin
Grafton · Warehouse #628
950 PORT WASHINGTON RD, Grafton, Wisconsin 53024-9201
Prices updated: August 8, 2026 at 5:00 PM
Regular
$3.859
PRICE PER GALLON
Press
Premium
$4.949
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 $3.859/gal, premium at $4.949/gal. Prices were last updated on August 8, 2026 at 5:00 PM.
Get directions to this Costco gas station30-Day Price History
30-day change
Regular
$3.859+0.320 (9.0%)
Premium
$4.949+0.410 (9.0%)
DateRegPrem
Aug 8, 5:00 PM$3.859$4.949
Aug 8, 3:00 PM$3.859$4.979
Aug 6, 4:00 PM$3.859$4.999
Aug 4, 4:00 PM$3.699$4.999
Aug 3, 4:00 PM$3.699$4.899
Aug 3, 8:00 AM—$4.899
Aug 3, 7:00 AM$3.699$4.899
Aug 2, 10:00 PM—$4.899
Aug 2, 9:00 PM$3.699$4.899
Jul 31, 4:00 PM$3.699$4.799
Jul 30, 4:00 PM$3.799$4.799
Jul 27, 7:00 PM$3.759$4.799
Jul 26, 7:00 PM$3.699$4.769
Jul 25, 4:00 PM$3.699$4.899
Jul 24, 3:00 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