Totally normal for any car to run rich, especially on cold days while the engine warms up. Rich just means the engine is operating with slightly more gas than necessary as it's safer during warm up though its less efficient and that's why you smell gas. The un-burned fuel is just going right out the tail pipe. Sniff back there to confirm.

Is this gas smell only outside of the vehicle or can you smell it inside. If it is inside that is a much bigger problem. As brain cells and gasoline don't get along.

So a few thoughts - Could be normal because of the cold start. Though if this is a new thing there is probably something new that is being exasperated by the cold start.

Hole in the exhaust system. This is letting you smell the normal exhaust smell where you are not used to smelling it. (Still dangerous to the brain)

You have a leaky fuel injector which is leaking into the cylinder and causing an extra rich start. This would be more likely to cause the smell on hot restarts.

Leak in the fuel system. Which goes away after the engine is warm due to expansion resealing a gasket or something.

Do to the dangers associated with fire and brain cells quitting. I would recommend you take it in sooner than later. You will probably have to leave it overnight so they can do a cold start on it.