Pretty much true with "normal" gas stoves (where the fuel is fed in as a vapor). If you have a stove where the gas canister can be inverted (you need a pre-heat loop for this to work), then a gas stove working in liquid feed mode can be used down to at least 0F/-18C.

Sometimes there's a tendency to see the stove world as either gas or liquid fuel. There is a sort of "middle ground" where you have gas stoves operating in liquid feed mode that shouldn't be overlooked. In inclement weather, it's awfully nice to be able to cook safely in a tent or vehicle. I'd generally prefer to cook indoors with gas than liquid fuel just because of priming. I've primed hundreds of stoves and rarely have a dangerous flare up anymore, but still...

HJ