The old city of Chiang mai is surrounded by a moat. Wat Jed Yod is located north west of the old city on the Super Highway. From the North West corner of the moat follow Huay Kaew road about 1.25 kilometer and turn right to road 11 (the Super highway). After about 1 km you find Wat Jed Yod on the left.
A visit to Wat Jed Yod can be easily combined with a visit to the nearby Chiang Mai National Museum, which is just 400 meters away (follow the superhighway to the north-east).