How to Store Waxworms Safely After Buying Them Locally or Online
I keep waxworms in rotation for the same reason most keepers do: they're the candy bar of the feeder world. My geckos and the occasional picky eater will lunge for a waxworm when they'll snub everything else, and they're a genuinely useful tool for coaxing a sick or underweight animal back onto food. But waxworms are also the feeder people waste the most, because they buy a cup, set it on a shelf, and come back a week later to find a tub of moths or a sour-smelling mess of dead larvae.
The fix is almost entirely about temperature, with ventilation and a few don'ts layered on top. Get those right and a cup of waxworms that "expires" in a week at room temperature will instead hold for two to three weeks, sometimes longer. Here's exactly how I store mine, whether they came from a local shop or showed up in a shipping box.
What waxworms actually are (and why it matters for storage)
Waxworms are the larvae of the greater wax moth, Galleria mellonella. In the wild they live inside beehives, eating beeswax, pollen, and honey, which is where all that fat comes from. The "worm" you buy is a soft, plump, creamy-beige caterpillar — and the whole point of storage is to keep it stuck in that larval stage for as long as possible.
That's the key mental model: you are not really feeding waxworms or growing them. You're putting them on pause. Left warm, a waxworm's biological clock runs forward — it stops eating, spins a cocoon, pupates, and emerges as a moth. Cold slows that clock to a crawl. Everything below is just a way of holding the worm in suspended animation without freezing it, drying it out, or letting mold move in.
One more thing worth saying up front, because it changes how you use them: waxworms are a treat, not a staple. They run over 20% fat and are relatively low in protein. They're excellent for tempting a finicky eater, putting weight on a thin animal, or as an occasional indulgence — but a steady waxworm diet leads to obesity and fatty-liver disease in reptiles. Think of them the way the dietitian thinks of dessert.
Temperature: the one thing that decides everything
If you remember nothing else, remember this range: store waxworms at 50–60°F (10–15.5°C). That window slows their metabolism enough to stall pupation while staying warm enough that the cold itself doesn't hurt them. Inside it, waxworms should be alive but sluggish — slow-moving when you nudge them, not stiff and not squirming energetically.
The two ways people kill waxworms are both temperature mistakes, in opposite directions.
Too cold kills them. Waxworms are not freeze-tolerant, and they start suffering well above freezing. Let them sit below roughly 40–50°F (4–10°C) and you'll lose them — slowly at first, then all at once. This is the trap with a normal kitchen refrigerator: most fridges are factory-set at or below 40°F to keep food safe, which is colder than waxworms can handle long-term. People "refrigerate" their waxworms exactly as advised and are baffled when the whole cup is dead in a few days. The main compartment is usually too cold.
Too warm wakes them up. Above about 60–70°F (16–21°C), the clock restarts. The worms get active, burn through their reserves, chew up their bedding, and start pupating into moths. Room temperature doesn't kill waxworms quickly — it just converts them into something you can't feed off, often within a week or two.
So where should they actually go? In order of how well they hold the target range:
- A wine cooler or a mini-fridge with an adjustable thermostat. This is the gold standard. You dial it to ~55°F and forget about it. If you go through waxworms (or other feeders) regularly, a cheap thermoelectric wine cooler pays for itself fast.
- A cool basement, insulated garage, or root-cellar-like spot — as long as it genuinely stays in the 50–60°F band year-round. Check it with a thermometer across seasons; a garage that's perfect in spring can cook them in July or freeze them in January.
- The warmest corner of a regular fridge, only as a last resort. The butter compartment or a door shelf runs warmer than the main box. Put a thermometer in there for a day first and confirm it isn't dipping below 50°F.
Whatever you pick, avoid sudden temperature swings. Yanking a cold cup out into a warm room and back chills and shocks the worms. Take out what you need quickly and return the rest.
Ventilation: let them breathe, keep the mold out
After temperature, airflow is the thing that saves or sinks a batch. Waxworms respire, and a sealed container traps both carbon dioxide and — more dangerously — moisture. That trapped humidity is what breeds mold, and mold is what turns a healthy cup into a write-off.
The container you bought them in is usually fine: most cups come with a ventilated or perforated lid for exactly this reason. If you transfer them to something larger (worth doing if you're storing more than about a week's worth, to cut overcrowding), use a plastic container with a breathable or mesh lid, or poke small holes in a solid one — small enough that the worms can't squeeze out, plentiful enough that air moves.
A few ventilation realities:
- Shallow and wide beats tall and deep. Spreading the worms out in a single loose layer means better airflow and less heat and moisture building up in a pile. Don't cram them.
- Watch for condensation. Beads of water on the lid or walls mean the air isn't moving and humidity is climbing. That's your early-warning sign for mold.
- Don't over-ventilate either. A container that's basically open will dry the bedding and the worms out. You want a gentle, steady exchange of air, not a wind tunnel.
Bedding, humidity, and feeding: mostly, leave it alone
Waxworms almost always ship in wood shavings, sawdust, or bran, and the best move is to keep that original substrate. It absorbs excess moisture, gives the worms something to grip and burrow in, and roughly mimics their natural nest. Resist the urge to "freshen" it on day one — you'll just stress them.
What you do want is to keep it dry and clean. Waxworms are low-humidity animals; aim to keep the storage area dry (a hygrometer reading under ~50% relative humidity is a good target) and away from steamy spots like kitchens and bathrooms. If the bedding ever feels damp, clumps together, or looks soiled, swap it for fresh dry shavings or bran — damp substrate is mold's favorite home. For short stays you won't need to touch it; for multi-week storage, refreshing it every couple of weeks keeps things clean.
On feeding: you usually don't need to. Cold-stored waxworms live off their own fat and require essentially nothing. The only time supplemental food earns its keep is if you're holding them for several weeks at the warmer end of the range — then a tiny amount of bran or a dab of honey every couple of weeks is plenty. Overfeeding is a classic mistake: extra food means extra moisture and waste, which means mold and mites. When in doubt, feed nothing.
A quick start-to-finish routine
Whether the cup came from a shop down the road or a box on your porch, the steps are the same:
- Inspect on arrival. Open the container and look the batch over. Pick out and discard any worms that are blackened, shriveled, mushy, or moldy before they spoil their neighbors. A faint earthy smell is normal; a sour, rotten one is not.
- Leave them in their shavings. Don't replace the substrate unless it's clearly wet or fouled. If you're storing more than a week's worth, move them to a slightly larger ventilated container with their original bedding to reduce crowding.
- Get them to 50–60°F. Into the wine cooler, mini-fridge, or cool basement they go. Confirm the spot actually holds that range with a thermometer — don't trust the dial blindly.
- Check weekly. Glance for mold, condensation, dead worms, mites, or anything pupating. Remove dead ones, dry out damp bedding, and you're done.
- Warm them up before feeding. A few minutes at room temperature perks them up so they wiggle, which makes them far more enticing to a reptile. Roll dusty worms in a paper towel to knock off shavings before offering.
Reading the warning signs
Inspecting takes ten seconds and saves whole batches. Healthy waxworms are plump, soft, creamy off-white to pale yellow, and gently active when disturbed. Pull individuals — or scrap the batch — when you see:
- Discoloration: turning dark gray, brown, or black is decay.
- Shriveling or wrinkling: dehydration or death.
- Black spots or blotches: bacterial or fungal infection.
- No movement at all: a worm that won't even twitch when nudged is dead or dying.
- A sour, foul odor: rotting worms; remove them immediately.
- Mold in the bedding, or tiny mites: both signal the container got too damp and the conditions have gone bad.
One spoiled worm contaminates the ones around it, so the habit that matters most is just removing the dead and dying as you spot them.
The short version
Waxworms aren't fragile so much as misunderstood: people store them like leftovers when they should be storing them like a paused clock. Keep them cool but not cold — 50 to 60°F, never below ~40–50°F. Skip the regular fridge's main compartment in favor of a wine cooler, mini-fridge, or cool basement. Leave them in their original dry shavings, give them gentle ventilation to keep mold away, don't bother feeding them, and pick out the bad ones as they appear. Do that and a cup that "should" last a week will carry you two to three, ready whenever you want to spoil an animal or tempt a reluctant eater.
When you're ready to restock, All Angles Creatures keeps healthy, well-started waxworms sized for reptiles, amphibians, and birds.
Want to build the everyday diet around something leaner? See how many mealworms your reptile should actually eat each day and my top 5 reptile feeders ranked by nutritional value to slot waxworms into the right place — as the treat, not the meal.