Laois enjoyed an impressive win over Carlow while there were defeats for Offaly and Westmeath.
Laois got their Leinster Under 20 Football Championship off to the best possible start on Tuesday evening with a comprehensive win over Carlow.
Goals from Jamie O'Brien and Killian Byrne helped the O'Moore County on their way to a 3-8 to 0-10 win in Portlaoise.
Offaly failed to take advantage of a strong wind in the first half of their contest with Louth in Darver.
The scores were level at 1-2 each at the break, and despite battling against the breeze throughout the second half, Ken Furlong's side lost on a final scoreline of 1-11 to 2-6.
Westmeath were faced with the most daunting task of the midlands counties with a trip to Dublin.
Last year's beaten Leinster finalists ran out 1-15 to 0-6 winners.
The defending Leinster and All Ireland champions Kildare started their defence strongly.
They were seven points better than Longford, winning 1-15 to 0-11.
Elsewhere, Wicklow were 0-12 to 1-7 winners over Wexford.
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