diff --git a/trajan/traj/orthogonal.py b/trajan/traj/orthogonal.py
index 7b9215a..fec7775 100644
--- a/trajan/traj/orthogonal.py
+++ b/trajan/traj/orthogonal.py
@@ -330,7 +330,7 @@ def gridtime(self, times, time_varname=None, round=True):
         #    {time_varname: np.where(~pd.isna(ds[time_varname].values))[0]})
 
         if ds.sizes[time_varname] > 0:
-            ds = ds.interp({time_varname: times})
+            ds = ds.interp({time_varname: times} kwargs={'fill_value': 'extrapolate'})
         else:
             logger.warning(f"time variable ({time_varname}) has zero size")