Yes
Yes, if they are paper or cardboard. Tear them up and add them to the bin.
VerdictYes
Breaks down inWeeks to 2 months
Counts asPaper
Why
Egg cartons made from paper pulp or cardboard are plant fibre and break down quickly. Polystyrene or plastic cartons don't break down, so check the material first.
Quick facts
| Carbon to nitrogen | About 350:1 |
|---|---|
| Hot pile | 2-4 weeks |
| Cold pile | 3-6 months |
| Worm bin | Yes · Small amounts, torn into pieces |
| Bokashi | Yes · Excellent for adding carbon to fermented waste |
| City green bin | Usually accepted in paper/cardboard recycling or green bins |
| Prep | Tear or shred into small pieces |
| Mix with | Balance with nitrogen-rich food scraps |
| Pest risk | Low · Low risk if buried in the pile |
How to compost egg cartons
- Tear the carton into small pieces.
- Soak it in water before adding, which speeds up breakdown.
- Mix it in with food scraps and dry material.
Watch out for
- Polystyrene foam cartons don't compost.
- Clear plastic cartons go in the recycling, not your bin.
- Printed ink on the carton adds chemicals.
Other ways to use egg cartons
- Use egg cartons for seed starting.
- Recycle clear plastic cartons where your city accepts them.
Common questions
Can I compost egg cartons?
Yes, paper and cardboard ones.
Can I compost foam egg cartons?
No. Foam doesn't break down.
Do egg cartons need to be soaked?
It helps them break down faster, but it isn't required.
Are egg cartons biodegradable?
Yes, paper and cardboard cartons are.
Rules vary by town and by composting method. When in doubt, check with your local composting or waste program.