Determining the year of your John Deer Tractor is simple. On the tractor, there is a label that has all of the information on it. This will include the year, model and serial number.
1 Additional Answer
The first diesel John Deere tractor was made in 1949. So, I'd say the year of your John Deere tractor is between 1949 and 2010. You can find your model number online to find out the exact year of your tractor. You can find more info at: www.antiquefarming.com