Feb 16, 2024 · The cost to start a large, commercial worm farm can range from $5,000 to over $100,000 with the main costs being the purchase of worms, land or warehouse to keep them in, and equipment like tractors, trommels, and forklifts. If you start small with a few lbs of worms, it will likely take 6-12 months to build your worm population up to a point