Start with sturdy stakes at least 6 to 7 feet tall.
Center a stake between each plant and drive it 12 inches into the ground using a sledgehammer or T-post driver.
Use a durable, weather-resistant twine that doesn’t stretch too much, like tomato twine (a 3-ply jute works well) or synthetic baler twine.
Starting about 8 inches above the ground, tie one end of the twine on the stake. Loop the twine across the back of the tomato plant, bring it around the front of the second plant, then behind the third plant.
When you reach the last stake, loop the twine around the stake in a figure-8, making sure the twine grips the stake and the line is taut, but not pulling too tightly to damage your tomato stems.