Outdoor hose faucets typically won’t have a separate shut off valve just for them. They are screwed directly into a threaded fitting that is attached to the pipe in the wall. This means the water must be shut off to the house in order to make repairs or replace these faucets.
Newer hose faucets are called “frostproof faucets” because they are long in design and shut off back inside the wall where it is less likely to freeze. Older hose faucets would almost be identical to washing machine multi-turn valves and would operate with an internal rubber washer.
There is one interesting quirk/feature about common construction practices in this area. If there is a hose faucet located close to the main water shut off valve in the front flower bed, there may be a separate, smaller valve in the “water box” that controls just this hose faucet.