# Available nights

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**Available nights:** Nights on a listing's calendar that a guest could book on the day we looked.

## How we measure it

We count open nights in the first 30, 60, 90 and 365 days of the calendar, starting from the first day of the observation month.

## What it is not

Few available nights does not prove high demand: a host may have blocked the calendar, and nights already past in the month count as unavailable, so late in a month the 30-day count covers only the nights left.

## Where it appears in the data

Field names as the API returns them; each dataset's page in the API lists the field's type and unit.

- `avail_30` in dataset `airbnb_depth_observations`
- `avail_90` in dataset `airbnb_depth_observations`

## Related

- [Short-term rental data: how we measure it](/methodology/short-term-rentals/)
- [All glossary terms](/glossary/)