The plt rprtd his apch speed was slightly fast & that he had landed long on the 2500′ grass strip. Subsequently, he was unable to stop the acft before it struck a snowbank at the end of the strip & it nosed over. The selected runway was aligned to the south. The wind was rprtd to be from the west at about 15 kts. Also, the grass strip was described as ‘slippery’ with patches of snow/ice.