Harpenden Colts Under-11 Eagles thrashed Hemel Athletic 5-0 on Sunday.
A hat-trick from George Thomas along with efforts from Callum Le'ake and Dylan Berry sealed the win.
The Eagles also drew 0-0 with Chorleywood the previous day in a match they dominated.
The team will face Comet Sports Blue in the Under-11 County Cup Final at the County Ground in Letchworth on Sunday with a 2.30pm kick-off.
The Under-10 Tigers won 2-0 against Wheathampstead Tigers after goals from Sam Dunn and Jack Edwards.
The Under-10 Jaguars' 11-match unbeaten league run came to end losing 3-1 against Bury Rangers Reds. James Gardner scored the consolation for Harpenden.
The Under-10 Panthers narrowly lost to Elite Feet 3-2 despite goals from Kian Thakrar and Alex Pearson.
The Under-10 Leopards lost 2-1 against Broxbourne Borough Royals with Alexander Van Weezel on target.
Harpenden Under-16 Warriors won their league game against New Frontiers 7-3. Goals were scored by Euan Stewart, Alex Fisher, Ben Spranger and four from Ben Hole.