David McKenna and Rico Kelly goals helped Cross to a comfortable 2-22 to 0-10 victory over Armagh Harps.
On a busy day of finals, Kilcoo secured a three-in-a-row of Down titles with a 3-10 to 0-11 win over Castlewellan.
Derrygonnelly beat Roslea 3-16 to 3-7 in the Fermanagh decider and Kingscourt edged out Castlerahan in Cavan.
Crossmaglen, six-time All-Ireland winners, will be fancied to add another Ulster title to their collection after an emphatic coiunty final victory.
They led 0-7 to 0-1 at the end of the opening quarter and Kelly's 28th minute goal gave them a 1-10 to 0-5 interval lead.
David McKenna bagged in a second after 43 minutes, with Tony Kernan top-scoring for Cross with 0-5.
Goals from Jerome Johnston and Paul Greenan put Kilcoo in control of the Down final in Newry.
They led by 2-2 to 0-4 at the interval, with Ryan Johnston's 45th minute goal clinching a fourth Down SFC title in five years.
Derrygonnelly secured an emotional victory over Roslea to be crowned Fermanagh SFC champions in Brewster Park.
The final was postponed by a week following the tragic death of club stalwart Damian McGovern and the team responded with a crushing win over the defending champions, who scored a goal after just 70 seconds from Niall Cosgrove.
Determined Derrygonnelly reeled off eight points in a row and even after Sean Quigley stopped the rot with a point, Paul Ward and Denis Greene bagged two goals within a minute to help Derrygonnelly lead 2-8 to 2-3 at the break.
Sean Quigley scored a second-half goal but Shane McGullion's 40th minute strike ensured the cup went back to Derrygonnelly for the first time since 2009.
Kingscourt edged out Castlerahan by 1-9 to 0-11 in the Cavan final, Philip Tinnelly with the match-winning goal in the 51st minute.
Elsewhere, Slaughtneil will play Cushendall in the Ulster club SHC final after their respective semi-final victories.
Derry football and hurling champions Slaughtneil defeated Down's Ballycran by 2-18 to 0-14 in Dungannon.
Defending Antrim and Ulster champions Cushendall beat Middletown (Armagh) by 1-17 to 1-9 in Owenbeg.
Crossmaglen Rangers extended their remarkable winning run in club football by securing a 19th Armagh SFC title in 20 years at the Athletic Grounds.