Getting rid of Ground Hogs and Moles in My Yard
The following is the link to our information on groundhogs, https://extension.umd.edu/hgic/topics/groundhogs
You might want to try an electric wire this year. It can be supplied with a solar panel.
Groundhogs are good climbers, so a high unstable or a floppy top on the fence can be helpful.
And here is our information on moles, http://extension.umd.edu/hgic/topics/moles