In Jain dharma, avocado is generally allowed for householders, with some care:

Why it is usually permitted

• Avocado is a fruit from a tree. It is plucked without uprooting or killing the whole plant.
• This fits the basic Jain food principle: prefer parts of plants (fruits, seeds, leaves) where the plant continues to live.

How to eat it in a Jain way

• Wash well, cut fresh in daylight.
• Check carefully for insects or black, spoiled parts.
• Eat it simple: plain, or with other Jain‑allowed items (no onion/garlic, no egg, etc.).
• Avoid eating it at night if you follow the no‑food‑after‑sunset rule.

When to be careful / ask your Guru

• During special vows (Paryushan, Ayambil, Upvaas, etc.) your pachchakkhan/maryada might restrict fruits or specific items. In that case, follow your Guru or local sangh.
• If your family or sangh has any special rule about “new” or foreign fruits, follow that first.

You can also see a related explanation here