Bard,
I've had real good luck hunting waterholes. Mule deer will hit water daily if it's hot. If there's snow on the ground they can get what they need from it. In the ponderosa forests around here we also have a mix of Gambels Oak. If we have a good moist spring/early summer the acorns off of the oak are like ice cream to the deer and black bears. Mountain Mahagony is another favorite browse. Also, around here we have some areas with Ponderosa, pinyon/juniper, oakbrush forests bordering agriculture, usually alfalfa fields. The deer in these areas obviously will hit the alfalfa daily or nightly.
If you can get around in your country this time of year I would be scouting for small spring seeps and waterholes. As summer approaches the feeding habits will change but the watering areas might not.
Good Luck