I'm at 5800' in the Northern Rockies (Zone 4) and I forage huckleberries, alpine whortleberries (grouse berries) wild raspberries, wild currants, thimble berries, wild strawberries, shaggy mane mushrooms, bolete mushrooms, sheep sorrel,
nettles, ramps, mullen, prince's pine, red and white clover, Oregon grape
root, bearberry and others I'm sure I'm forgetting.