From the Internet (your mileage may vary). Variable include weight, distance to clear a 50' obstacle etc. These are my interpretations.
DHC-4:
Takeoff: 725 feet (221m) at 28,500 pounds. Clear 50 ft (15 m) obstacle 1185 feet (361m)
Landing: 525 feet (160m) at 26,000 pounds. Clear 50 ft (15 m) obstacle 1235 feet (376m)
DHC-5:
Takeoff: 1,040 feet (317m) at 41,000 pounds (18,598kg) on grass. No data if this includes clearing the 50' obstacle.
Landing: 610 feet (186m) at normal landing weight on grass. No data if this includes clearing the 50' obstacle.
Found this:
DHC-4 Original Sales Brochure (PDF)