There is no universal answer to this - it varies by jurisldiction and local law. A good safe estimate is at least 15 feet either side of it.
In Virginia, the minimum distance away from a fire hydrant you must be parked is 15 feet.
About the length of a firetruck would make common sense. Access to that fire hydrant could mean the difference of life and death of people if there is a fire near by. Most cities will have painted the curb red around hydrants.
15 ft
Most U.S. states require at least 15 feet between a fire hydrant and a parked car. Some require more, like California, which requires 20.
15' in my state.
You cannot stop or park within 15 feet of a fire hydrant. You can receive a ticket if you park too close to a hydrant.
Each state in the U.S. can vary on this law. Of the four states I have had a license, three allow no closer than 15 feet. (Washington state, North Carolina, Texas) Oregon lets you park as close as 10 feet to a hydrant.
5 meters
18 feet away.
It is illegal to park a car in front of a fire hydrant.
10 feet, dont park near it unless you want a hoseline run through your car.
When you arrive at a scene of a fire or accident, you should park your vehicle where it will not cause what an unnecessary obstruction to other emergency personnel.DO NOT:Block the roadway or thoroughfare.Block the clear access of a fire truck.Block the clear access of anyone in Command, ex. Fire Chief, who has not yet arrived (or who needs to leave).Block a fire hydrant unless you want firemen to smash your windows to put the hose through your vehicle.Block an ambulance from getting close enough to the scene.Block-in any other parked emergency vehicle, example, the police.Park too close to a burning building.Park on sidewalks.Block in residents' vehicles, esp. if they need moved out of the way.