How We Check Our Data
Where each fact on CostcoGasHours.com comes from, how recently it was checked, and what we can't promise.
The short version
- Locations and addresses come from OpenStreetMap. Where a station is matched to a Google Maps listing, missing addresses, ZIP codes and phone numbers were filled from that listing.
- Weekly hours come from the station's Google Maps business listing or from OpenStreetMap. Every station page names the source and shows the date the hours were last checked.
- Prices are community reports, reviewed before publication and shown with how recently they were reported. Some station pages also show the price on the station's Google listing, labelled separately.
- Regional averages come from the U.S. Energy Information Administration (EIA) weekly retail gasoline price survey.
- Holiday closures come from a news report citing Costco's website, and are marked as a secondary source.
- We are not affiliated with Costco. Hours and prices can change without notice; confirm at the station.
Station locations
The station list (coordinates, addresses, and some opening hours) was imported from OpenStreetMap, a free map maintained by volunteers, and reviewed by our admin team. Stations matched to a Google Maps place had missing address details, phone numbers and hours filled from that listing.
Station location data © OpenStreetMap contributors, available under the Open Database License (ODbL).
Opening hours
Each station page lists the weekly hours we have on file, says where they came from (the station's Google Maps business listing or OpenStreetMap) and shows the date they were last checked.
Stations without verified hours say so instead of showing guessed times, and are left out of our sitemaps. State and city summaries ("most stations open at…") are calculated only from the stations that have hours on file, and say how many stations that is.
Community prices
Drivers can report the price they saw at the pump from any station page. Reports are rate-limited and reviewed before they are published, and every published price carries a label saying how recently it was reported. When nothing recent has been reported, the page says so.
Google listing prices
Some station pages also show the fuel prices published on the station's Google Maps listing, fetched through the official Google Places API when the page is viewed. They appear in a separate card labelled "Live from Google", with Google's attribution, and are not treated as community-verified.
Regional averages
State and station pages compare against the average retail price of gasoline in the station's region (PADD), from the U.S. EIA weekly retail gasoline and diesel prices. The week the figure applies to is shown next to it.
Holiday closures
Our holiday list comes from NBC News, “Is Costco open on Labor Day?”, 1 Sep 2025, which cites Costco's website. It is a secondary source (checked November 10, 2026), and we say so wherever the list appears. See holiday hours.
What we can't guarantee
- Stations change their hours, especially around holidays and during maintenance. The "last checked" date tells you how fresh our copy is.
- Fuel prices can change several times a day. A reported price is what one driver saw at the time shown.
- Not every Costco gas station has hours on file, and a station can close or open before our data catches up.
- Always confirm at the pump or with the warehouse before a long trip.
Found a mistake?
Every station page has a "Report a mistake" link, and you can report a current price from the station page itself. You can also contact us with the station and what's wrong, and we will review it.
Independence
CostcoGasHours.com is an independent directory. It is not affiliated with, endorsed by, or operated by Costco Wholesale Corporation or Google LLC. See also About.