Place a stock pot over medium heat. Once hot, add the bacon and cook until crispy. Transfer to a plate and set aside, leaving the bacon fat in the pot.
Add diced onion, celery, and carrots to the pot. Saute for about 6 to 8 minutes or until softened and onions are translucent.
Add diced zucchini, potatoes, crushed tomatoes, Worcestershire sauce, clam juice, and thyme leaves into the pot. Mix, then let it come to a simmer for about 20 minutes.