The Saints youngsters came up against teams from Leicester, Sale, Worcester, Leeds and Newcastle, and - one draw aside - swept all before them in the 12-a-side tournament, scoring 14 tries in all and conceding just one.
Each match lasted 17 minutes, but neither the time nor weather stopped the Saints, whose results were as follows:
Newcastle W 15-0
Leicester W 10-0
Sale W 15-0
Worcester W 20-0
Leeds D 5-5
"The boys started slowly, but gained a lot of confidence and understand on how to play in tricky conditions," said Saints Elite Player Development Group manager Ross Stewart. "All the players have come a long way this season, and last weekend showed the various things they've been working on.
"To score 14 tries in such wet conditions is a credit to the boys' trust in their ability to play and confidence in each other. This was backed up by a physical edge in defence and attack.
"The tournament has given the lads their first taste of a higher level of rugby and hopefully we'll see them kick on again next season.
"I'd like to thank all the parents for their continued support and commitment throughout the season, driving their sons to training and to matches across the country. Hopefully they have enjoyed the season as much as we have!"