Elevation Gains?

What is considered a difficult run in terms of elevation gains?  Today my run was + 474 meters or 1556 feet (from Google Maps not Garmin) and I am not sure if that is good or just average.  I live in a pretty hilly area and I could potentially add more if needed.  My runs usually have just over 250 meters of elevation gain or 820 feet.  I never run more than 7.5 miles per run.  

sounds pretty hilly to me.  elevation is very relative, hills that are moderate to light for some people may be a deal breaker for others.  also, factors like gradient weigh very heavily.  i.e., i can run forever on slightly sloping/low gradient hills, but the short/medium sharp inclines and declines wear me out quickly.

Ok so the major hill I ran is 307 meters elevation gain over 4.5 km which makes it 14.6%?  Is that correct??  Its a killer hill, straight up.  

Sounds pretty hilly to me.  The 307M over 4.5K would work out to 7.7% grade according to my calculations ( http://veloroutes.org/tools/ )  That is still a killer incline over that far.  I wish I could find something that steep and long around my home on the coast.  I have found some hills that are 11 or 12% but they are only 1/3 mile or less.   I'm not sure where you live but it sounds like you should be a candidate for the Mt. Washington road race (12% over 7.6 miles)   

 I live north of Jerusalem (AKA the West Bank), in very hilly country.  Its great for running!