Best Time to Pick: August – September WITHIN THE PARK: Non-commercial berry picking is allowed within the National Park. Two quarts per person per day of huckleberries, blackberries, thimbleberries and salmonberries may be gathered by hand. This small quantity has been determined to not adversely affect park wildlife, the reproductive potential of the plant species, or otherwise adversely affect park resources. Berry picking tip: huckleberries are best at Indian Henry’s Hunting Grounds and along the Noble Knob trail. OUTSIDE THE PARK: The area just outside the southern boundaries of the park is also well known for huckleberry picking, which grow in open areas at elevations over 4,000 feet. East Lewis County near Packwood and Randle are the most popular areas. Three gallons per person are allowed (non commercial) without a permit. Huckleberry Locations.