Problem: Grid and/or graticule labels in ArcMap will not draw
A grid and/or a graticule is created in the ArcMap Layout view, but the labels for the grid will not draw.
The point value of the Label Offset must be at least 1/2 the point value of the labels, or the labels will not draw.
For example, the default Label Offset point value is 6. If the Label Size value is set to a value greater than 12, the labels will not draw.
Solution or Workaround
In ArcMap, navigate to the Tools > Options > General tab, and uncheck the Wizard Mode box to turn off Wizard Mode.
In the ArcMap Layout view, navigate to the View > Data Frame Properties > Grids tab, and select the existing grid. A new grid can also be created at this time as the following steps are relevant for both new and existing grids.
While in the View > Data Frame Properties > Grids tab, make sure the grid is turned on and selected. Click on the Properties button for the grid.
Select the Labels tab, and adjust the Label Size and the Label Offset value, so that the Label Offset is no less than 1/2 the Label Size.