There’s no one best time to buy gasoline. It all depends on what you need and where you live. If your local stations sell premium fuel, it could be a good idea to stop by after Thanksgiving and get their last shipment of the year, if they have any left. For regular gas, there are three times that can be considered peak season: July 4th through Labor Day; the week before Christmas; or right after Christmas (usually around January 1). Each of those dates has its own unique challenges for buying gas at certain prices.