Preparations for many of the squads began back in June, with the Ulster Under-20s enjoying a four-day training camp at the Masserene Army base and successful warm-up matches against Instonians, Coleraine and the Ulster Under-19 team.
Log onto IrishRugby.ie for full coverage of the championships - match reports, reaction and profiles - over the coming weeks.
The opening games of the championships will see an enticing Leinster v Ulster double-header take place at Dr. Hickey Park, the home of Greystones RFC, while the Sportsground will stage the Connacht-Munster clashes today and tomorrow.
2007 IRFU UNDER-19 INTERPROVINCIAL CHAMPIONSHIP:
Saturday, September 1 - LEINSTER v ULSTER, Dr. Hickey Park, 2pm
Leinster: Eoghan Conran; Robert Johnson, Shane Gahan, Matt Keville, Colm Brady; Ian McKinley, Matt Healy; Ronan Donnelly, David Tunney, Raymond Dufficy, Nick Mullen, Mark Flanagan, Steve Mahony (capt), Alex Byrne, Daragh Maher.
Replacements (from): Ben Harrison, George Beatty, Greg Whately, Max Waters, Ciaran Smith, John Dever, Rory Stynes, James Murray, Ciaran Donohoe, Ian Morley.
Ulster Squad: Backs - Michael Sargent, Sam Bell, Peter Henderson, Robin Thompson, David Nicholson, Kyle Kirkpatrick, David Funston (capt), Matthew Arneill, Peter Elliot, David McIlwaine.
Forwards - Alan Whitten, Michael Cromie, Richard McNeely, Paul Jackson, Paul Ross, Mark McDowell, Paul Rea, Chris McCracken, Gareth Hooks, Jamie Lusk, Mark Jones, Michael Browne.
Saturday, September 1- CONNACHT v MUNSTER, The Sportsground, 1pm
Connacht: Lee Keegan; Shane O'Connor, Trevor Nally, James O'Beirne, Cian Moyles; Eric Flynn, Bernie Ward; Martin Nee, Karl Egan, James Robinson, Fergus Moyles, Dave Hansbury, Dave Ott, Liam Carpenter, Mattie Flynn.
Replacements: Denis Buckley, Tom English, Jason Barrett, Greg Leader, Peter Walsh, Joe Ryan, Rory O'Connor.
Munster: Ronan O'Mahoney; Odhran Mulrooney, Danny Barnes, Andrew Joyce, Paul Gleeson; Colm Downes, Conor Murray; Gavin Duffy, David Twomey, Felix Ross, Mike Linehan, Ian Duffy, James Flood, Paddy Cleary, James Ryan (capt).
Replacements: Shane Walsh, Andrew Cudmore, Darren Kavanagh, Leon Toland, Darren Mulcair, Alex O'Mahony, Michael Kelliher.
2007 IRFU UNDER-20 INTERPROVINCIAL CHAMPIONSHIP:
Friday, August 31 - CONNACHT v MUNSTER, The Sportsground, 5pm
Connacht: Alan Gaughan; Aengus O'Connell, Billy Henshaw, David Clarke, Killian McDonagh; Robert O'Beirne, Cathal Sheridan; Jason East, Stanley Hayes, Conor Higgins, Joe Moran, David Nolan, John Southern, Dermot Murphy, Trevor Conneely (capt).
Replacements: Barry Gibbons, Peter Comisky, Niall Harney, Martin Cummins, Andrew Sherry, Ross Shaughnessy, Cian Moyles.
Munster: Ritchie Mullane; Sean Scanlon, Murray Kinsella, Scott Deasy, John Verling; Andrew Burke, Eoghan Kennedy; John Ryan, Mike Sherry, Steve Archer, Ian Nagle, Dave Foley, Liam Og Murphy, James O'Neill, Kieran Essex.
Replacements (from): Matt Kearney, David Kilcoyne, John Griffin, John Noonan, Noel Kinnane, Diarmuid Upton, Declan Cusack, Mark Cosgrove, Diarmuid McMahon.
Saturday, September 1 - LEINSTER v ULSTER, Dr. Hickey Park, 4pm
Leinster: Niall Morris; David Kearney, Shane Rogers, Conor Cleary, Eamon Sheridan; Ian Madigan, David Moore; Ian Leonard, Jason Harris Wright, Patrick McCabe, Eoin Sheriff, Brian Cawley, Jonathan Slattery, Paul Ryan (capt), Patrick Mallon.
Replacements: Ciaran Egan, Ben Barclay, Daniel Kenny, Rajan Reilly, Kris Greene, Mark Geraghty, David Mongan.
Ulster: Tommy Seymour; Stuart Lester, Jamie Smith, William Stewart, Chris Cochrane; Harry McAleese, Michael Wilson; Paul Karayiannis, Stephen Douglas (capt), Mathew Nelson, Patrick McGowan, James Sandford, Alistair Birch, Michael Entwhistle, James Elliott.
Replacements: David Halliday, Connor Browne, David Bradford, Neil Alcorn, David Johnston, Will Martin, Andy Moore.