Moon is waxing

The Moon is waxing condition passes while the moon is waxing, the half of the lunar month when the lit part grows from the new moon toward the full moon. Home Assistant works this out from the date, so it needs no account, no internet connection, and no location.

Use it to gate an automation on the rising half of the moon’s cycle, for example to run a routine only while the moon is on its way to full.

Using this condition from the user interface

If you prefer building automations visually, Home Assistant walks you through this condition step by step. You pick what to check, tweak a few options, and save. No YAML knowledge required.

To use this condition in an automation:

1. Go to Settings > Automations & scenes.
2. Open an existing automation, or select Create automation > Create new automation.
3. In the And if section, select Add condition.
4. From the search box, search for and select Moon is waxing.
5. Select Save.

Using this condition in YAML

If you work directly in YAML, or you want to know exactly what Home Assistant does under the hood, this section has the technical reference. It lists the field names you use in YAML, their types, and which ones are required.

In YAML, refer to this condition as moon.is_waxing. It has no options:

condition: moon.is_waxing

This passes while the moon is waxing.

Good to know

• This condition does not use a target. It checks the moon phase, which is the same everywhere on Earth, so it does not depend on your home location.
• The moon waxes from the new moon up to the full moon, then wanes from the full moon back to the new moon. For the opposite check, use Moon is waning.
• The phase is based on the date, so it changes at most once a day.
• To test for a single phase instead of the direction, use Moon phase.

Try it yourself

Ready to test this? Go to Settings > Automations & scenes, open an automation, and add this condition. Trigger the automation with and without the condition met, and watch whether it continues or stops.

More examples

Real scenarios where this condition gates an automation. Copy any example and adapt it to your setup.

Automation: planting reminder while the moon is waxing

Some gardeners sow by the moon. Each morning, send a reminder, but only while the moon is waxing.

• Trigger: Time
  • At time: 9:00:00 AM
• Condition: Moon is waxing
• Action: Send a notification message
  • Target: My Device (notify.my_device)

alias: "Waxing moon planting reminder"
triggers:
  - trigger: time
    at: "09:00:00"
conditions:
  - condition: moon.is_waxing
actions:
  - action: notify.send_message
    target:
      entity_id: notify.my_device
    data:
      message: "The moon is waxing, a good time to sow."

Still stuck?

The Home Assistant community is quick to help: join Discord for real-time chat, post on the community forum with the condition you’re using and what you expected to happen, or share on our subreddit /r/homeassistant.

Related conditions

These conditions work well alongside this one:

• Moon is waning: Tests if the moon is waning.

• Moon phase: Tests if the moon is in a specific phase.