Costco Gas Prices in Grafton, Wisconsin
Grafton · Warehouse #628
950 PORT WASHINGTON RD, Grafton, Wisconsin 53024-9201
Prices updated: September 3, 2026 at 7:00 PM
Regular
$3.699
PRICE PER GALLON
Press
Premium
$4.829
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 $4.829/gal. Prices were last updated on September 3, 2026 at 7:00 PM.
Get directions to this Costco gas station30-Day Price History
30-day change
Regular
$3.699−0.160 (4.1%)
Premium
$4.829−0.170 (3.4%)
DateRegPrem
Sep 3, 7:00 PM$3.699$4.829
Sep 2, 5:00 PM$3.699$4.899
Sep 1, 5:00 PM$3.859$4.859
Aug 31, 3:00 PM$3.699$4.859
Aug 30, 4:00 PM$3.699$4.879
Aug 29, 4:00 PM$3.699$4.899
Aug 27, 4:00 PM$3.699$4.879
Aug 25, 4:00 PM$3.699$4.899
Aug 24, 5:00 PM$3.879$4.899
Aug 24, 5:00 AM—$4.899
Aug 24, 4:00 AM$3.879$4.899
Aug 24, 3:00 AM—$4.899
Aug 24, 2:00 AM$3.879$4.899
Aug 23, 5:00 PM$3.859$4.949
Aug 22, 5:00 PM$3.859$4.959
Aug 21, 5:00 AM—$4.959
Aug 21, 4:00 AM$3.859$4.959
Aug 18, 4:00 PM$3.879$4.959
Aug 16, 4:00 PM$3.859$4.959
Aug 14, 4:00 PM$3.859$4.999
Aug 12, 4:00 PM$3.859$4.949
Aug 8, 3:00 PM$3.859$4.979
Aug 6, 4:00 PM$3.859$4.999