The average price of a regular gallon of gas jumped 13 cents in the past two weeks to $2.20, ending a sustained drop.
Industry analyst Trilby Lundberg said Sunday that a rebound in the price of crude oil caused the run-up at the pump.
However, the price is $1.10 below the mark a year ago, on Feb. 7, 2014.
San Francisco continued to have the highest-priced gas in the Lower 48 states at $2.59 a gallon.
The low average was in Tucson, Arizona, at $1.82. The average price in California is up 9 cents, to $2.53.
Lundberg says pump prices could climb as much as a dime in the near future, unless oil prices show significant declines.