When can we hit off the grass?

I get asked all the time why can't we hit off the grass on the driving range tee. The photo below was taken today after using the tee for the weekend. Our driving range is not long enough to hit off the front of the tee, too many balls go over the fence. So, we are restricted to use only the back of the tee. The small area of the tee that is usable can only handle a couple events per year. It will take about a month for this war zone to recover, so it's not fit for play in the mean time.