Make Your Bin
Build a simple, effective worm bin from materials you can find at any hardware store.
A good worm bin doesn't have to be fancy or expensive. The goal is a dark, moist, well-ventilated home for your worms. Here's everything you need to get started.
What You'll Need
- A plastic storage bin, 20–25 gallons (for a family of 3–5)
- A drill with a ¼" bit for ventilation holes
- Window screen or fine mesh (to cover holes and prevent escapes)
- Shredded newspaper or cardboard for bedding
- A second bin or tray to catch any drainage
- A lid (most storage bins come with one)
Step-by-Step Instructions
Choose your bin
Pick an opaque plastic storage bin — worms prefer darkness. A 20–25 gallon bin works well for a family of 3–5. Avoid clear bins; if you use one, wrap it in dark plastic or keep it in a dark location.
Drill ventilation holes
Drill ¼" holes around the upper sides and lid of the bin for airflow. Space them about 2 inches apart. Good ventilation prevents odors and keeps your worms healthy.
Cover the holes with screen
Cut small squares of window screen and hot-glue or tape them over the holes on the inside. This keeps worms in and pests out.
Add a drainage tray
Place a second shallow bin or tray under your worm bin to catch any excess moisture. You can use this liquid (worm leachate) diluted as a plant fertilizer.
Add bedding
Fill the bin about halfway with moist shredded newspaper (strips about ¼ inch wide). The bedding should feel like a wrung-out sponge — damp but not dripping. You can also mix in some finished compost or garden soil to introduce beneficial microbes.
Your bin is ready!
Once your bin is set up with bedding, you're ready to add worms and start composting. See the Start Your Bin guide for next steps.
Pro Tip
Keep your bin indoors or in a garage where temperatures stay between 40°F and 80°F. Worms thrive around 72°F. Avoid placing the bin in direct sunlight or near heat sources.