Played at Hanwell Town’s Powerday Stadium, Hayes & Yeading took a 26th minute lead when a Hassan Jalloh cross was powerfully headed past Boro `keeper Jacob Knightbridge by Reece Cole.
And just 4 minutes later, Cole turned provider when his free-kick was firmly headed home by Jerry Wiltshire.
Harrow had a great chance to get back into the game in the 35th minute but Anointed Chukwu was unable to beat Hayes & Yeading `keeper Jack Smith from an acute angle.
Ten minutes into the second half, United came close to scoring a third when Jalloh rounded the keeper but saw his effort blocked on the line by Samuel Adenola.
But, on 57 minutes, United did score a third when Wiltshire netted his second after a he fired a loose ball past Knightbridge.
In the aftermath of the goal, Harrow substitute James Ewington was shown a straight red card.
It was 4-0 just past the hour-mark when Moses Emmanuel drove forward before slotting the ball past Knightbridge.
And Emmanuel made it a nap hand as time ticked into the 90th minute with a fine finish after getting in behind the Harrow backline.
It was Hayes & Yeading’s first county cup triumph.
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