The most plentiful, and some of the biggest and best, blackberries we've ever seen were along the Oregon coast in August of 1991. We were gradually drifting south from Alaska, had spent a week at an RV park in Canon Beach, OR, then started south again. On August 18, we stopped to pick blackberries along the road right-of-way, then stopped at a grocery store for Certo (fruit pectin) and jar lids. I washed the berries and froze two bags for cobblers, then we made 4 pints of blackberry jelly (and had 3/4 cup of juice left). We could easily have gotten a lot more, but you don't have a lot of room in a 32' fifth-wheel with 6 cu. ft. refrigerator.:laughing: