Although winter is closing in there is still time to get a Speed’s hot dog, named the best in the U.S. earlier this year in this Wall Street Journal piece. Chef Gregg will be open for a while, until it gets too cold or his snowplow duties at Logan take precedence.
Speed’s is open Monday through Friday opening at 9:30AM and closing at 5PM (or whenever they run out of dogs for the day).
More info and finding the quirky location are located in this Chowhound thread.