> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v23** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/KeywordPlanForecastPeriod).

The forecasting period associated with the keyword plan.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v23/resources/keyword_plan.proto)

| Fields ||
|---|---|
| ## `interval` Union field. Required. The date used for forecasting the Plan. `interval` can be only one of the following: ||
| ### `date_interval` | `KeywordPlanForecastInterval` A future date range relative to the current date used for forecasting. |
| ### `date_range` | `DateRange` The custom date range used for forecasting. It cannot be greater than a year. The start and end dates must be in the future. Otherwise, an error will be returned when the forecasting action is performed. The start and end dates are inclusive. |