diff --git a/src/database.py b/src/database.py
index 2d7e917..7fd8391 100644
--- a/src/database.py
+++ b/src/database.py
@@ -195,6 +195,7 @@ def get_latest_forecast_values_for_a_specific_gsp_from_database(
     forecast_horizon_minutes: Optional[int] = None,
     start_datetime_utc: Optional[datetime] = None,
     end_datetime_utc: Optional[datetime] = None,
+    creation_utc_limit: Optional[datetime] = None,
 ) -> List[ForecastValue]:
     """Get the forecast values for yesterday and today for one gsp
 
@@ -207,7 +208,7 @@ def get_latest_forecast_values_for_a_specific_gsp_from_database(
 
     start_datetime = get_start_datetime(start_datetime=start_datetime_utc)
 
-    if forecast_horizon_minutes is None:
+    if (forecast_horizon_minutes is None) and (creation_utc_limit is None):
         forecast_values = get_forecast_values_latest(
             session=session,
             gsp_id=gsp_id,
@@ -225,6 +226,7 @@ def get_latest_forecast_values_for_a_specific_gsp_from_database(
             model_name="blend",
             model=ForecastValueSevenDaysSQL,
             only_return_latest=True,
+            created_utc_limit=creation_utc_limit,
         )
 
     # convert to pydantic objects
diff --git a/src/gsp.py b/src/gsp.py
index 1907bbb..9d9497f 100644
--- a/src/gsp.py
+++ b/src/gsp.py
@@ -141,6 +141,7 @@ def get_forecasts_for_a_specific_gsp(
     user: Auth0User = Security(get_user()),
     start_datetime_utc: Optional[str] = None,
     end_datetime_utc: Optional[str] = None,
+    creation_limit_utc: Optional[str] = None,
 ) -> Union[Forecast, List[ForecastValue]]:
     """### Get recent forecast values for a specific GSP
 
@@ -160,6 +161,7 @@ def get_forecasts_for_a_specific_gsp(
     - **forecast_horizon_minutes**: optional forecast horizon in minutes (ex. 60
     - **start_datetime_utc**: optional start datetime for the query.
     - **end_datetime_utc**: optional end datetime for the query.
+    - **creation_utc_limit**: optional, only return forecasts made before this datetime.
     returns the latest forecast made 60 minutes before the target time)
     """
 
@@ -178,6 +180,7 @@ def get_forecasts_for_a_specific_gsp(
         forecast_horizon_minutes=forecast_horizon_minutes,
         start_datetime_utc=start_datetime_utc,
         end_datetime_utc=end_datetime_utc,
+        creation_utc_limit=creation_limit_utc,
     )
 
     logger.debug("Got forecast values for a specific gsp.")
diff --git a/src/tests/test_gsp.py b/src/tests/test_gsp.py
index c0dde7f..57f38f7 100644
--- a/src/tests/test_gsp.py
+++ b/src/tests/test_gsp.py
@@ -5,6 +5,7 @@
 from nowcasting_datamodel.fake import make_fake_forecasts
 from nowcasting_datamodel.models import (
     ForecastValue,
+    ForecastValueSevenDaysSQL,
     GSPYield,
     Location,
     LocationSQL,
@@ -12,6 +13,7 @@
     ManyForecasts,
 )
 from nowcasting_datamodel.read.read import get_model
+from nowcasting_datamodel.save.save import save_all_forecast_values_seven_days
 from nowcasting_datamodel.save.update import update_all_forecast_latest
 
 from database import get_session
@@ -38,6 +40,38 @@ def test_read_latest_one_gsp(db_session, api_client):
     _ = [ForecastValue(**f) for f in response.json()]
 
 
+def test_read_latest_one_gsp_filter_creation_utc(db_session, api_client):
+    """Check main solar/GB/gsp/{gsp_id}/forecast route works"""
+
+    with freeze_time("2022-01-01"):
+        forecasts = make_fake_forecasts(
+            gsp_ids=list(range(0, 2)), session=db_session, model_name="blend", n_fake_forecasts=10
+        )
+        db_session.add_all(forecasts)
+        db_session.commit()
+        save_all_forecast_values_seven_days(forecasts=forecasts, session=db_session)
+
+    with freeze_time("2022-01-02"):
+        forecasts_2 = make_fake_forecasts(
+            gsp_ids=list(range(0, 2)), session=db_session, model_name="blend", n_fake_forecasts=10
+        )
+        db_session.add_all(forecasts_2)
+        db_session.commit()
+        save_all_forecast_values_seven_days(forecasts=forecasts_2, session=db_session)
+        assert len(db_session.query(ForecastValueSevenDaysSQL).all()) == 2 * 2 * 10
+
+    with freeze_time("2022-01-03"):
+        app.dependency_overrides[get_session] = lambda: db_session
+
+        response = api_client.get("/v0/solar/GB/gsp/1/forecast?creation_limit_utc=2022-01-02")
+
+        assert response.status_code == 200
+
+        f = [ForecastValue(**f) for f in response.json()]
+        assert len(f) == 10
+        assert f[0].target_time == forecasts[1].forecast_values[0].target_time
+
+
 def test_read_latest_all_gsp(db_session, api_client):
     """Check main solar/GB/gsp/forecast/all route works"""