Inside or outside? All the outside citrus has died here, and technically we're in the tropical zone 5 (though the nursery says don't bother with anything over 3)
Outside in the summer, sunroom for winter. Most don't like it under 40F or even 50F for some, although figs can take a freeze. They just go dormant.
I've got one great grapefruit with your name on it, just come claim it.
The grapefruit is probably one of the few things they'd actually stop you for at the fruit police station.
You need to move another 6 miles east.