Whether you're storing worms for a weekend fishing trip, building a composting bin, or just trying to keep a batch of live worms healthy until you're ready to use them, keeping earthworms alive is easier than most people think — once you know the basics.
At Wired Worm Farm, we keep thousands of worms alive and thriving every day. The principles are simple, but the details matter. In this comprehensive guide, we'll share our best tips and tricks for keeping earthworms alive longer, whether they're composting worms, fishing bait, or garden helpers.
Why Do Worms Die? Understanding the Basics
Before we get into solutions, let's understand the most common reasons worms die prematurely:
- Dehydration — Worms breathe through their skin. If their environment dries out, they suffocate.
- Overheating — Worms are cold-blooded and extremely sensitive to heat. Temperatures above 85°F–90°F can be fatal.
- Drowning — While worms need moisture, standing water eliminates oxygen and drowns them.
- Starvation — Worms need food (or at least microbe-rich bedding to munch on).
- Toxic conditions — Chemicals, pesticides, excessive salt, and certain foods can poison worms.
- Lack of oxygen — Worms need air. Sealed containers, compacted bedding, and anaerobic conditions kill worms.
Every tip in this guide addresses one or more of these root causes.
How to Keep Composting Worms Alive in a Worm Bin
If you're running a vermicomposting bin with Red Wigglers, European Nightcrawlers, or another composting species, these are the golden rules for keeping your worms healthy long-term:
1. Maintain the Right Moisture Level
This is the single most important factor. Your worm bedding should feel like a wrung-out sponge — moist throughout but not dripping wet. If you squeeze a handful of bedding and more than a drop or two of water comes out, it's too wet. If it feels crumbly and dry, add water.
Pro tip: Mist the surface with a spray bottle rather than pouring water directly in. This helps you add moisture gradually and evenly.
2. Keep Temperatures in the Sweet Spot
Composting worms thrive between 55°F and 80°F. Here's how to manage temperature:
- In summer: Keep bins in shade, in a garage, or in an air-conditioned space. Freeze water bottles and place them on top of the bedding for emergency cooling.
- In winter: Insulate outdoor bins with straw bales, blankets, or foam board. Move bins indoors if temperatures drop below freezing.
3. Don't Overfeed
Overfeeding is the #1 mistake new worm bin owners make. Uneaten food rots, generates heat, attracts pests, and creates acidic, toxic conditions.
Rule of thumb: Feed your worms about half their body weight per day. For 1 pound of worms, that's roughly ½ pound of food scraps. If food from the last feeding is still sitting there uneaten, don't add more.
4. Provide Quality Bedding
Good bedding serves multiple purposes: it holds moisture, provides habitat, offers supplemental food (worms eat decomposing bedding too), and creates air pockets for oxygen flow.
Best bedding materials:
- Shredded newspaper (non-glossy, black and white print is fine)
- Shredded corrugated cardboard
- Coconut coir (soaked and squeezed)
- Aged leaves (avoid fresh, waxy leaves)
- Peat moss (use sparingly — it's acidic)
5. Ensure Proper Ventilation
Your worm bin needs air holes. If you're using a plastic tote, drill ¼-inch holes in the lid and upper sides of the bin. Without ventilation, carbon dioxide builds up and oxygen levels drop, creating anaerobic conditions that stress and kill worms.
6. Monitor pH
Worms prefer a neutral to slightly acidic pH (6.0–7.0). If your bin becomes too acidic (from overfeeding fruit, citrus, or coffee grounds), add crushed eggshells or a light dusting of agricultural lime (calcium carbonate, NOT hydrated lime) to buffer the pH.
7. Avoid Harmful Foods
Keep these out of your worm bin:
- Meat, fish, and bones
- Dairy products
- Oily or greasy foods
- Excessive citrus or onion
- Hot peppers or spicy foods
- Pet waste
- Chemically treated yard waste
How to Keep Fishing Worms Alive
If you've bought a batch of worms for fishing — whether they're Canadian Nightcrawlers, European Nightcrawlers, or Red Wigglers — here's how to keep them alive and lively until you're ready to hit the water.
Short-Term Storage (A Few Days to a Week)
1. Keep them cool. The refrigerator is your best friend for short-term worm storage. A temperature of 40°F–50°F will slow the worms' metabolism and keep them alive for days or even weeks.
2. Use the right container. A ventilated container (like a bait cup with holes, or a small plastic tub with a perforated lid) works well. Don't seal them in an airtight container — they'll suffocate.
3. Use appropriate bedding. Damp (not wet) newspaper, peat moss, or the bedding they arrived in will keep worms comfortable. Avoid soil from your yard, which may contain chemicals or organisms harmful to the worms.
4. Don't feed them. For short-term storage, worms don't need additional food. The bedding provides enough sustenance. Adding food to a small container can cause rot and kill the worms.
5. Check moisture daily. If the bedding feels dry, mist it lightly with water. If water is pooling at the bottom of the container, drain it or add dry bedding.
Long-Term Storage (Weeks to Months)
If you want to keep fishing worms alive for an extended period, you're essentially setting up a mini worm bin:
- Use a larger container (a small plastic tote works well)
- Add 4–6 inches of damp bedding
- Store in a cool location (basement, garage, or refrigerator)
- Feed very lightly every few days (a small piece of banana peel, a few coffee grounds)
- Change bedding every 2–3 weeks to prevent buildup of waste
- Ensure adequate ventilation
How to Keep Worms Alive During Shipping
If you've ordered worms online — say, from Wired Worm Farm — and you're worried about them surviving the trip, here are some reassurance points:
- We package our worms in breathable, insulated containers with damp bedding to maintain moisture and temperature during transit.
- Worms can survive 2–5 days in transit under normal conditions.
- When your worms arrive, open the package promptly, mist them lightly if needed, and place them in their prepared bin.
- Don't worry if some worms seem sluggish at first — they often perk up within a few hours of being placed in fresh bedding.
What to do when your worms arrive:
- Prepare your bin with damp bedding in advance.
- Open the shipping container and gently spread the worms on top of the bedding.
- Leave the bin lid off (or shine a light on top) for 15–30 minutes — this encourages the worms to burrow down into the bedding.
- After the worms have burrowed in, close the lid and leave them alone for 2–3 days before feeding.
10 Quick Tips to Keep Worms Alive Longer
- Never let the bedding dry out. Moisture = life for worms.
- Avoid direct sunlight. Worms are photophobic — light stresses and can kill them.
- Keep temperatures stable. Avoid rapid temperature swings.
- Don't use tap water with heavy chlorine. Let tap water sit out for 24 hours to dechlorinate, or use filtered water.
- Add crushed eggshells regularly. They provide grit for digestion and buffer pH.
- Keep the bin dark. Worms work best in complete darkness.
- Fluff the bedding occasionally. This prevents compaction and improves air circulation.
- Remove uneaten food before it rots and creates problems.
- Don't use pesticides or herbicides near your worm bin or on materials going into the bin.
- Be patient and observant. Check your bin regularly and adjust conditions as needed.
The Bottom Line
Keeping earthworms alive is all about creating and maintaining a stable, comfortable environment that meets their basic needs: moisture, temperature, food, air, and darkness. Whether you're managing a composting bin, storing fishing bait, or caring for newly shipped worms, the principles are the same.
At Wired Worm Farm, we raise healthy, hardy worms and ship them with care. When they arrive at your door, they're ready to thrive — and with the tips in this guide, you'll keep them alive and productive for a long time.